527 CMR 12.00 - Massachusetts Electrical Code

Current through Register 1466, April 1, 2022

90.2(B)(5). Delete (d) and revise (c) to read as follows:
(c) Are located in legally established easements, rights-of-way, or by other agreements either designated by or recognized by the public service commissions, utility commissions, or other regulatory agencies having jurisdiction for such installations.

Informational Note: Wiring systems that are maintained by utilities and that operate under this exclusion from coverage by the Massachusetts Electrical Code include, regardless of ownership, luminaires for street and area lighting directly connected to such systems.

90.4. Revise the first paragraph to read as follows:
90.4 Enforcement. This Code shall be used by the authority enforcing the Code and exercising legal jurisdiction over electrical installations. The authority having jurisdiction of enforcement of the Code shall accept listed and labeled equipment or materials where used or installed in accordance with instructions included with the listing and labeling. The authority shall have the responsibility for deciding upon the approval of unlisted or unlabeled equipment and materials, and for granting the special permission contemplated in a number of the rules.
90.6. Revise to read as follows:
90.6 Interpretations and Appeals. To promote uniformity of interpretation and application of the provisions of this Code, interpretations may be requested from the Board of Fire Prevention Regulations. Requests for interpretation shall be in the form of a question that can receive a "Yes" or "No" answer. This in no way supersedes the right of any individual who is aggrieved by the decision of an Inspector of Wires to appeal from that decision to the Board of Electricians' Appeals in accordance with M.G.L. c. 143, § 3P. The Board of Fire Prevention Regulations shall, upon the request of the Board of Electricians' Appeals, render interpretations to the Board of Electricians' Appeals.

It is customary to revise this Code periodically to conform with developments in the art and the result of experience, and the current edition of the Code shall always be used.

90.10. Add new section numbered 90.10 to read:
90.10. References to Commonwealth of Massachusetts Codes, Regulations, and Laws. References are included in Appendix A for Building Codes, Elevator Regulations, Plumbing and Fuel Gas Code, Board of Fire Prevention Regulations, Division of Industrial Safety, State Sanitary Code, Fire Safety Code, Permit Applications, and Chapters of the General Laws. See Appendix A.

Article 100. Coordination, Selective (Selective Coordination). Revise this definition to read as follows:

Localization of an overcurrent condition to restrict outages to the circuit or equipment affected for fault current events that extend beyond 0.1 second, and accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the range of available overcurrents under such conditions, whether originating from overload, ground-fault, or short circuit, and for the full range of overcurrent protective device opening times applicable to such events.

110.13(B). Revise the second paragraph to read as follows:

Electrical equipment provided with ventilating openings shall be installed so that walls, ceilings or other obstructions do not prevent free air circulation of air through the equipment.

110.14(A). Delete the last sentence of the first paragraph and insert the following two sentences in its place:

Connection by means of wire binding screws or studs and nuts having upturned lugs or equivalent shall be permitted for 10 AWG or smaller solid conductors. Where stranded conductors are terminated on and not looped through such terminals, the terminals shall be identified for such use, or the strands at the terminals shall be made solid.

110.16(B). Delete this subsection.
110.24. Insert an additional informational note as follows:

Informational Note No. 3. The marking required in this section is useful in determining compliance with 110.9, but must be understood as transitory and requiring reconfirmation prior to the performance of additional electrical work. This and numerous other locations in the NEC require field markings of the available fault current. A major component of this current is usually that contributed by the utility through the service. The utility contribution is inherently dynamic in value, particularly on the medium voltage portions of their distributions. Without notice, automatic line sectionalizing can transfer a service from the tail end of one circuit to the head end of an adjacent circuit, with a significant increase in available fault current. In addition, there are numerous sources of on-site contributions to available fault current.

110.26(A)(1). Add a fourth paragraph (d) as follows:
(d) Adequate Accessibility. By special permission, smaller spaces may be permitted where it is judged that the particular arrangement of the installation will provide adequate accessibility.
110.26(A)(4)(4). Revise to read as follows:

The space in front of the enclosure shall comply with the depth requirements of Table 110.26(A)(1), and shall be unobstructed to the floor by fixed cabinets, walls, or partitions. Space reductions in accordance with 110.26(A)(1)(b) shall be permitted. The maximum height of the working space shall be the height necessary to install the equipment in the limited space. A horizontal ceiling structural member or access panel shall be permitted in this space provided the location of weight-bearing structural members does not result in a side reach of more than 150 mm (6 in.) to work within the enclosure.

210.8. Revise the second paragraph to read as follows:

For the purposes of this section, when determining distance from receptacles the distance shall be measured as the shortest path the supply cord of equipment connected to the receptacle would follow without piercing a floor, wall, ceiling, fixed barrier, or without passing through a cabinet door opening, doorway, or window.

210.8(A)(7). Revise to read as follows:
(7) Sinks - where receptacles are installed within 1.8 m (6 ft.) from the top inside edge of the bowl of the sink, or where located within a cabinet supporting a sink.
210.8(B)(5). Revise to read as follows:
(5) Sinks - where receptacles are installed within 1.8 m (6 ft.) from the top inside edge of the bowl of the sink, or where located within a cabinet supporting a sink.
210.8(F). Delete this requirement.
210.12(A). Revise the parent text to read as follows:

All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices installed in dwelling units shall be protected by any of the means described in 210.12(A)(1) through (A)(6).

210.21(B). Insert a new fifth paragraph as follows:
(5) Receptacles on Individual Branch Circuits. A receptacle outlet installed to comply with a requirement for an individual branch circuit shall contain a single receptacle, or a multiple receptacle if, and then only to the extent that, the supplied equipment includes multiple supply cord connections.
210.25(B). Add an exception as follows:

Exception: Branch circuits supplying lighting outlets in common areas on the same floor as a dwelling unit in a new or existing two-family or an existing three-family building shall be permitted to be supplied from equipment that supplies one or more of those dwelling units.

210.52(A)(2)(1). Revise to read as follows:

Any space 600 mm (2 ft.) or more in width (including space measured around corners) and unbroken along the floor line by doorways, fireplaces, and similar openings.

210.52(A)(4). Delete 210.52(A)(4) in its entirety.
210.52(C). Make the following three revisions:
I. In the parent language, delete the clause "and shall not be considered as the receptacle outlets required by 210.52(A)."
II. In 210.52(C)(2), revise (b) by adding the following sentence at the end:

"A receptacle in a wall countertop or work surface that directly faces a peninsular countertop or work surface shall be permitted to serve as the receptacle for the peninsular space where the spaces are contiguous and the receptacle is located within 1.8 m (6 ft.) of its most distant edge."

III. At the end of 210.52(C)(2) insert an exception as follows:

Exception: Any portion of an island or peninsular countertop or work surface that permanently allows for seating and extends 300 mm (1 ft.) or more from its supporting cabinet or other structure shall not be required to be served by receptacle outlets, and shall be excluded from the area calculation in (a). The portion excluded shall be 750 mm (30 in.) in depth as measured perpendicular to the countertop edge. Where the entire surface of an island countertop or work surface permanently allows for seating there shall be at least one receptacle outlet installed at a location determined by the installer, designer, or building owner in accordance with 210.52(C)(3).

210.52(C)(3). Revise to read as follows:
(3) Peninsular Countertop Spaces. At least one receptacle outlet shall be installed at each peninsular countertop long dimension space with a long dimension of 600 mm (24 in.) or greater and a short dimension of 300 mm (12 in.) or greater. A receptacle in a wall countertop space that directly faces a peninsular countertop shall be permitted to serve as the receptacle for the peninsular space where the spaces are contiguous and the receptacle is located within 1.8 m (6 ft) of its most distant edge.
220.12. Revise the second exception to read as follows:

Exception No. 2: Where a building is designed and constructed to comply with an energy code adopted by the local authority and specifying an overall lighting density of less than 13.5 volt-amperes/m2 (1.2 volt-amperes/ft2), the unit lighting loads in Table 220.12 for office and bank areas within the building shall be permitted to be reduced by 11 volt-amperes/m2 (1 volt-amperes/ft2).

225.30(E). Revise to read as follows:
(E) Documented Switching Procedures. Additional feeders or branch circuits shall be permitted to supply large capacity multibuilding industrial or institutional installations under single management where documented safe switching procedures are established and maintained for disconnection.
225.30(F). Revise to read as follows:
(F) Documented Switching Procedures. Additional feeders or branch circuits shall be permitted to supply large capacity multibuilding industrial or institutional installations under single management where documented safe switching procedures are established and maintained for disconnection.
225.32 Exception No. 1. Revise to read as follows:

Exception No. 1: For large capacity multibuilding industrial or institutional installations under single management where documented safe switching procedures are established and maintained for disconnection, and where the disconnection is monitored by qualified individuals, the disconnecting means shall be permitted to be located elsewhere on the premises.

230.85. Revise to add the following exceptions:

Exception to (1), (2), and (3): A building requiring an emergency disconnect(s) supplied by a service lateral or by underground service conductors which terminate inside the building shall be permitted to be capable of disconnection from a readily accessible location outside of the dwelling by using a method providing remote control of the service disconnecting means, and marked: REMOTE EMERGENCY ELECTRICAL DISCONNECT and NOT SERVICE EQUIPMENT.

Markings shall comply with 110.21(B). This section shall only apply to the following:

(1) New one- and two-family dwellings, or new buildings of double occupancy, at least one of which is a dwelling unit.
(2) Two-family dwellings or buildings of double occupancy at least one of which is a dwelling unit, and newly created by subdivision of an existing one-family dwelling.
(3) One- and two-family dwellings where the service equipment in either or both dwelling units is entirely replaced.
(4) One- and two-family dwellings where the service equipment in either or both dwelling units is being increased in capacity in terms of its rating in amperes.
240.24(A). Revise the exception to read as follows:

Exception: The use of a tool shall be permitted to access overcurrent devices located within listed industrial control panels, or within enclosures designed for hazardous (classified) locations or adverse environmental conditions. An enclosure within the scope of this exception, and all overcurrent device(s) within such enclosures as judged with the enclosure open, shall comply with the accessibility provisions of 240.24(A).

250.130(C). Delete this subsection.
300.4(D). Delete this subsection.
300.5(A). Add an informational note to this subsection as follows:

Informational Note: Cables suitable for direct burial are often sleeved in various raceways for design reasons. If such cable is installed with sufficient cover for direct burial, then the characteristics of that raceway need not be evaluated. Other rules of this Code that apply to raceways generally may apply. See 300.5(H).

300.5(D). Revise to read as follows:
(D) Protection from Damage. Direct-buried conductors and cables shall be protected from damage in accordance with 300.5(D)(1) through 300.5(D)(4). Buried raceways enclosing service conductors shall additionally meet the requirement in 300.5(D)(3).
300.11(B). Revise this subsection as follows:
I. Delete the second sentence in 300.11(B) which reads: "Support wires and associated fittings that provide secure support and that are installed in addition to the ceiling grid support wires shall be permitted as the sole support."
II. Revise 300.11(B)(2) to read as follows:
(2) Nonfire-rated Assemblies. Branch-circuit wiring associated with equipment that is located within, supported by, or secured to a suspended ceiling that is not an integral portion of a fire-rated floor/ceiling or roof/ceiling assembly shall be permitted to be supported by the ceiling support wires.
III. Delete 300.11(B)(2) Exception.
300.17. Add a second paragraph as follows:

Where different raceway wiring methods are joined together without a pull point at the transition, there shall not be more than the equivalent of four quarter bends (360 E total) between pull points, e.g., conduit bodies and boxes.

300.50. In Note 3 to Table 300.50, insert the words "or institutional" after the word "industrial".
310.12. Delete the second paragraph.
310.15(B)(2). Change the strut thickness dimension in the second paragraph from "23 mm ( f in.)" to "19 mm (¾ in.)".
310.15(C)(1). Delete the fourth itemized adjustment provision (d) covering AC and MC cable.
310.15(C)(1). Revise Table 310.15(C)(1) to read as follows:

Number of Conductors1

Percent of Values in Tables 310.16 through 310.19, as Adjusted for Ambient Temperature if Necessary

4 through 6

80

7 through 24

70

25 through 42

60

43 and above

50

1 Number of Conductors is the total number of conductors in the raceway or cable, including spare conductors. The count shall be adjusted in accordance with 310.15(E) and (F), and shall not include conductors that are connected to electrical components, but that cannot be simultaneously energized.

Informational Note: Overheating may occur where continuous, fully loaded conductor diversity is less than 50% and the number of current-carrying conductors exceeds nine. See 310.15(C).

320.80(A). Delete the last sentence of the first paragraph, which reads: "The 90°C (194°F) rating shall be permitted to be used for ampacity adjustment and correction calculations; however, the ampacity shall not exceed that for a 60°C (140°F) rated conductor."
334.10. Insert an exception to follow (3) to read as follows:

Exception to (2) and (3): For buildings or structures required to be of Type I or Type II construction, Type NM, or Type NMC cables shall be permitted to be used, provided that where so applied in buildings or structures exceeding three stories above grade, circuits run in Type NM or NMC cable shall not leave the floor or dwelling unit from which the circuits originate. Cables shall be installed within walls, floors, or ceilings that provide a thermal barrier of material that has at least a 15-minute finish rating as identified in listings of fire-rated assemblies.

334.12(A)(2) Revise to read as follows:
(2) In dropped or suspended ceilings in other than one- and two-family and multifamily dwellings, unless run so as to closely follow the surface of framing members, running boards, or the equivalent, or unless connected to luminaires or other pieces of electrical equipment in accordance with 334.30(B)(2).
334.17 Revise to read as follows:
334.17 Through or Parallel to Framing Members and Furring Strips. Types NM and NMC cable shall comply with 300.4 where installed through studs, joists, rafters, and similar members. Grommets or bushings shall be used in metal studs as required in 300.4(B)(1), shall remain in place during the wall finishing process, shall cover the complete opening, and shall be listed for the purpose of cable protection.

In both exposed and concealed locations, where the cable is installed parallel to framing members, such as joists, rafters, or studs, or is installed parallel to furring strips, the cable shall be secured so that the nearest outside surface of the cable is not less than 19 mm (¾ in.) from the nearest edge of the framing member or furring strip where nails or screws are likely to penetrate. Where this distance cannot be maintained, the cable shall be protected from penetration by nails or screws by a steel plate, sleeve, or equivalent at least 1.6 mm (1/16 in.) thick. A listed and marked steel plate less than 1.6 mm (1/16 in.) thick that provides equal or better protection against nail or screw penetration shall be permitted for this purpose.

Exception: For concealed work in finished buildings, or finished panels for prefabricated buildings where such supporting is impracticable, it shall be permitted to fish the cable between access points.

334.30. Revise 334.30 as follows [(A), (B), and (C) unchanged from the NEC]:
334.30 Securing and Supporting. Nonmetallic-sheathed cable shall be secured by staples, cable ties, straps, or similar fittings so designed and installed as to not damage the cable. The cable length between the cable entry and the closest cable support shall not exceed 450 mm (18 in.). Where staples are used for cable sizes smaller than three 8 AWG conductors, they shall be of the insulated type, or listed noninsulated staples driven by staple guns shall be permitted. Cable shall be secured in place at intervals not exceeding 1.4 m (4½ ft.) and within 300 mm (12 in.) from every cabinet, box, or fitting. Where the cable is run diagonally behind strapping of a nominal 19 mm (¾ in.) thickness it shall be considered supported, secured, and in compliance with 334.17 where it is not pulled taut. For other than within 300 mm (12 in.) of a cable termination at a cabinet, box, or fitting, cables passing through successive holes in adjacent framing members no more than 600 mm (24 in.) apart shall be considered to be secured.

Sections of cable protected from physical damage by raceway shall not be required to be secured within the raceway.

334.80. Delete the second paragraph and revise the first paragraph to read as follows:
334.80 Ampacity. Type NM and NMC cables shall have conductors rated at 90°C (194°F). Where installed in thermal insulation, the ampacity of conductors shall be that of 60°C (140°F) conductors. The ampacity of Types NM and NMC cables installed in cable tray shall be determined in accordance with 392.11.
336.10(9). Revise to read as follows (exception unchanged):
(9) In one- and two-family dwelling units, Type TC-ER cable containing both power and control conductors that is identified for pulling through structural members shall be permitted. Type TC-ER cable used as interior wiring shall be installed in accordance with the requirements of Part II of Article 334 and Article 725, and where installed as exterior wiring, shall be installed in accordance with the requirements of Part II of Article 340.
338.10(B)(4). Insert a third informational note as follows:

Informational Note No. 3: This section includes service entrance cables with a round configuration commonly known as SER cable. The interior installation of this cable is governed by the same rules as apply to nonmetallic sheathed cable.

338.10(B)(4)(a). Revise the second paragraph to read, and add a third informational note as follows:

Where installed in thermal insulation, the ampacity shall be in accordance with the 60°C (140°F) conductor temperature rating. The maximum conductor temperature rating shall be permitted to be used for ampacity adjustment and correction purposes, if the final derated ampacity does not exceed that for a 60°C (140°F) rated conductor.

Informational Note No. 3: This section includes service entrance cables with a round configuration commonly known as SER cable. The interior installation of this cable is governed by the same rules as apply to nonmetallic sheathed cable.

338.10(B)(4)(a)(3). Revise to read as follows:

Where installed in thermal insulation, the ampacity shall be in accordance with the 60°C (140°F) conductor temperature rating. The maximum conductor temperature rating shall be permitted to be used for ampacity adjustment and correction purposes, if the final derated ampacity does not exceed that for a 60°C (140°F) rated conductor.

344.6. Add an exception as follows:

Exception: Rigid metal conduit made from stainless steel or from nonferrous metals other than aluminum shall be permitted to be approved.

350.10(4). Delete the words "per 110.14(C)" from the end of the requirement.
352.12. Add a new (F) to read as follows:
(F) High-rise Buildings. Where used in buildings more than 21 m (70 ft.) above mean grade, rigid nonmetallic conduit shall not be used unless the building is protected by an approved fire sprinkler system(s) installed on all floors as a complete system, or the conduit is concealed behind a thermal barrier as described in 362.10(2) or 362.10(5), or the conduit is encased in not less than 50 mm (2 in.) of concrete.
368.8. Insert a new Section 368.8 in Part I of Article 368 as follows:
368.8 Tests Prior to Energizing. Busway system joint tightness, phasing, and insulation resistance shall be verified by test prior to energizing the system for the first time. Joint resistance shall be evaluated by a qualified person using equipment identified for the specific function. A written record of these tests shall be made available to the authority having jurisdiction.
368.14. Insert a new Section 368.14 in Part II of Article 368 as follows:
368.14 Protection from Liquids, Moisture and Other Contaminants. Busway shall be protected from liquids, moisture, and other contaminants or corrosion that may result in electrical failure.
(A) During Construction. Indoor busways shall be protected from moisture during storage as well as during or after installation. Special consideration shall be given to riser busways to protect them from moisture from uncompleted roofs, walls, etc.

Outdoor busways shall be treated the same as indoor busways until after busway is properly installed, as it is not weather resistant until completely and properly installed.

Busway shall have the exposed ends of uncompleted runs protected to prevent accidental contamination during the construction period.

(B) Protection from Snow Buildup. Outdoor busway shall be mounted in such a manner as to prevent snow or ice buildup forcing water into the busway through weep holes. This may require that consideration be given to horizontal snow or ice buildup or drifting of snow.
(C) Protection from Falling Liquids. Slant shields, drip pans, or other approved protective shields shall be installed to protect indoor busway in locations where there is a possibility of water spillage or dripping condensate from roof drains, water pipes, and the like.
368.56(B). Revise the rule in list item (2) and the exception to (B)(2) to read as follows:
(2) The length of the cord or cable from a busway plug-in device to a suitable tension take-up support device shall not exceed 2.5 m (8 ft).

Exception to (B)(2): By special permission in industrial establishments only, where the conditions of maintenance and supervision ensure that only qualified persons will service the installation, flexible cord suitable for hard usage or extra hard usage or bus drop cable shall be permitted to extend horizontally greater lengths than 2.5 m (8 ft.) where the longer length is essential for periodic repositioning of equipment. The flexible cord or bus drop cable shall be supported at intervals not to exceed 2.5 m (8 ft.), and suitable tension take-up device(s) shall be installed at the end of the horizontal run to relieve strain in both the horizontal and vertical directions.

372.23. Revise this section to read as follows:
372.23 Ampacity of Conductors. The ampacity adjustment factors in 310.15(C)(1) shall not apply where 30 or fewer current-carrying conductors occupy no more than 20% of the interior cross-sectional area of cellular concrete floor raceways.
374.23. Revise this section to read as follows:
374.23 Ampacity of Conductors. The ampacity adjustment factors in 310.15(C)(1) shall not apply where 30 or fewer current-carrying conductors occupy no more than 20% of the interior cross-sectional area of cellular metal floor raceways.
390.17. Revise this section to read as follows:
390.17 Ampacity of Conductors. The ampacity adjustment factors in 310.15(B)(3)(a) shall not apply where 30 or fewer current-carrying conductors occupy no more than 20% of the interior cross-sectional area of underfloor raceways.
390.23. Revise this section to read as follows:
390.23 Ampacity of Conductors. The ampacity adjustment factors in 310.15(C)(1) shall not apply where 30 or fewer current-carrying conductors occupy no more than 20% of the interior cross-sectional area of underfloor raceways.
400.5. Revise Table 400.5(A)(3) to read as follows:

Number of Conductors

Percent of Values in Tables 400-5 (A) and 400-5(B)

4 through 6

80

7 through 24

70

25 through 42

60

43 and above

50

Informational Note: Overheating may occur where continuous, fully loaded conductor diversity is less than 50% and the number of current-carrying conductors exceeds nine. See 310.14(A)(3).

400.12(4). Revise the existing exception as follows:

Exception to (4): Flexible cord and cable shall be permitted to be installed in accordance with 368.56(B) and 590.4. For other applications, where the length of the cord from the supply termination to a suitable tension take-up device is limited to 2.5 m (8 ft.), flexible cord shall be permitted to have one connection to the building surface.

400.17. Revise the second paragraph to read as follows:

Flexible cords and cables shall be permitted to be installed in raceways not longer than 15 m (50 ft.) in length where required to protect the flexible cord or cable from physical damage. The ampacity of the conductors within a raceway shall be adjusted in accordance with Table 400.5(A)(3) based on the total number of current-carrying conductors within the raceway, and then further derated by a factor of 0.8, or the ampacity shall be calculated in accordance with 310.14(B). The raceway shall be exposed over its entire length.

406.4(D)(3). Delete the exception.
406.4(D)(4). In Exception No. 2, correct the reference to read "210.12(D)."
410.16(C). Revise items (1) through (4) to read as follows:
(1) 300 mm (12 in.) for surface-mounted incandescent luminaires with a completely enclosed light source, or for LED luminaires not covered in (2) following, that are installed on the wall above the door or on the ceiling.
(2) 150 mm (6 in.) for surface-mounted fluorescent luminaires, or for surface-mounted LED luminaires that are factory wired with their drivers, and that are installed on the wall above the door or on the ceiling.
(3) 150 mm (6 in.) for recessed incandescent luminaires, or for LED luminaires not covered in (4) following, with a completely enclosed light source, and that are installed in the wall or the ceiling.
(4) 150 mm (6 in.) for recessed fluorescent luminaires, or for recessed LED luminaires that are factory wired with their drivers, and that are installed in the wall or the ceiling.
410.36(B). Add a second paragraph as follows:

In addition to, or in lieu of, the mechanical fastening means, luminaires equaling or exceeding 1.8 kg (4 lb.) shall be directly supported to the building structure or to approved intermediate supports rigidly secured to the building structure. The luminaire support shall be by wire, chain, or threaded rod of sufficient strength to carry the luminaire. Luminaires equal to or greater than 600 mm (2 ft.), nominal, on a side shall be supported at each end of a diagonal axis, regardless of weight.

440.14. Insert a third informational note as follows:

Informational Note No. 3: See 440.3(B) for general provisions regarding the inapplicability of Article 440 to equipment that does not incorporate hermetic refrigerant motor- compressors. See also 430.109(B) for specific provisions governing the disconnecting requirements for such equipment, wherever located, that uses a motor that is 1/8 hp or less.

505.9(E)(2). Revise the second paragraph to read as follows:

Metric threaded fittings installed into explosionproof or flameproof equipment entries shall have a class of fit of at least 6g/6H and be made up with at least five threads fully engaged.

517.13(B)(1). Delete Exception No. 2.
517.26. Delete (2), which would otherwise read: "Section 700.10(D) shall not apply."
550.2 Manufactured Home, Informational Note No. 2. Add the following sentence:

Manufactured housing that is not designed to be transportable on running gear, and that is not produced under regulations that expressly cover such housing, is classified under Article 545.

551.71. Revise (F) to read as follows:
(F) GFCI Protection. Ground fault circuit interrupter protection shall be provided for 125-volt, 15 and 20 ampere receptacles. Receptacles within recreational vehicle site equipment of a higher amperage or voltage rating shall not be subject to the GFCI provisions in 210.8(B).

Informational Note No 1: Appliances used within the recreational vehicle can create leakage current levels at the supply receptacle(s) that could exceed the limits of a Class A GFCI device.

Informational Note No 2: The definition of power supply assembly in 551.2 and the definition of a feeder in Article 100 clarify that the power supply cord to a recreational vehicle is considered a feeder.

555.2. Insert two new definitions as follows:

Docking Facility. A covered or open, fixed or floating structure that provides access to the water and to which boats are secured.

Marina. A facility, generally on the waterfront, that stores and services boats in berths, on moorings, and in dry storage or stack storage.

555.3. Revise this section to read as follows:
555.3 Ground-fault Protection. For other than floating buildings covered by 553.4, ground-fault protection for docking facilities shall be provided in accordance with (A) and (B).
(A) Feeder and Branch Circuit Conductors. Feeder and branch circuit conductors that are installed on docking facilities shall be provided with ground-fault protection set to open at currents not exceeding 30 mA. Coordination with downstream ground-fault protection shall be permitted at the feeder overcurrent protective device.

Exception: Transformer secondary conductors of a separately derived system that do not exceed 3 m (10 ft) and are installed in a raceway shall be permitted to be installed without ground-fault protection. This exception shall also apply to the supply terminals of the equipment supplied by the transformer secondary conductors.

(B) Receptacles Providing Shore Power. In lieu of the requirement of 210.8, receptacles installed in accordance with 555.19(A) shall be permitted to have ground-fault protection set to open at currents not exceeding 30 mA.
590.4(G). Revise to read as follows:
590.4(G) Splices. A box, conduit body, or other enclosure, with a cover installed, shall be required for all splices.

Exception: On construction sites, a box, conduit body, or other enclosure shall not be required for either of the following conditions:

(1) The circuit conductors being spliced are all from nonmetallic multiconductor cord or cable assemblies, provided further that the equipment grounding continuity is maintained with or without the box.
(2) The circuit conductors being spliced are all from metal sheathed cable assemblies terminated in listed fittings that mechanically secure the cable sheath to maintain effective electrical continuity.
620.51(D)(2). Delete this requirement.
625.17(B). Revise to read as follows:
(B) Output Cable to the Electric Vehicle. The output cable to the electric vehicle shall be one of the following:
(1) Listed Type EV, EVJ, EVE, EVJE, EVT, or EVJT flexible cable as specified in Table 400.4
(2) An integral part of listed electric vehicle supply equipment

Informational Note: For information and listing requirements for electric vehicle supply equipment, see UL Standards 2594-2016, Standard for Electric Vehicle Supply Equipment, and UL 2202-2009, Standard for Electric Vehicle (EV) Charging System Equipment.

625.44(A). Revise to read as follows:
625.44(A) Portable Equipment. Portable equipment shall be connected to the premises wiring systems by one or more of the following methods:
(1) A nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated 125-volts, single-phase, 15- or 20-amperes.
(2) A nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated 250-volts, single-phase, 15- or 20-amperes.
(3) A nonlocking, 2-pole, 3-wire or 3-pole, 4 wire grounding-type receptacle outlet rated at 250-volts, single-phase, 30- or 50-amperes.
(4) A nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated 60-volts dc maximum, 15- or 20-amperes

The length of the power supply cord, if provided, between the receptacle outlet and the equipment shall be in accordance with 625.17(A) (3).

625.54. Insert a new section as follows:
625.54 Ground-fault Circuit-interrupter Protection for Personnel. All single-phase receptacles installed for the connection of electric vehicle charging that are rated 150 volts to ground or less, and 50 amperes or less shall have ground-fault circuit-interrupter protection for personnel.
625.56. Insert a new section as follows:
625.56 Receptacle Enclosures. All receptacles installed in a wet location for electric vehicle charging shall have an enclosure that is weatherproof with the attachment plug cap inserted or removed.
680.4. Delete this requirement.
680.8. Insert an informational note ahead of 680.8(A) as follows:

Informational Note: Unlisted swimming pool pump motors have been observed in the field as having been supplied by their manufacturer with undersized cords, cords of excessive length, cord connectors on outdoor applications that are unsuitable for wet locations, and other violations of this Code. The fact that a manufacturer may supply them in this form does not excuse compliance with the rules of this Code.

Listed storable swimming pool pump motors with long factory-supplied cords are prominently marked as such and are not covered in Part II of Article 680. They are not manufactured for use with permanently installed pools and they need not be bonded where used as intended. See 680.31.

680.21(A)(1). Revise the second paragraph to read as follows:

Where installed in dry, noncorrosive environments, branch circuits shall comply with the general requirements in Chapter 3. Any wiring method employed shall contain an insulated or covered equipment grounding conductor of a wire type, sized in accordance with 250.122, but not smaller than 12 AWG.

680.23(F)(1). Wiring Methods. Revise the requirement to read as follows:

Branch circuit wiring on the supply side of enclosures and junction boxes connected to underwater luminaires and running in corrosive, wet, or below-grade locations shall comply with 680.14 or shall be liquidtight flexible nonmetallic conduit. Wiring methods in dry, noncorrosive locations within or on buildings shall be selected and run in accordance with the applicable requirements in Chapter 3. Wiring in all locations shall include an insulated or covered equipment grounding conductor of a wire type, sized in accordance with 250.122, but not smaller than 12 AWG.

(Exception unchanged from the NEC.)

680.26(B)(2)(b). Insert an additional paragraph to follow the five item list and reading as follows:

"This method shall only be permitted for above-ground pools."

680.74(A). Delete numbered paragraphs (3), (4), and (5). Delete Exception No. 1 and designate Exception No. 2 as Exception No. 1.
690.31(D)(2). Revise the second sentence of the second paragraph to read as follows:

The labels shall be reflective, all letters shall be capitalized, and the letters shall have a minimum height of 9.5 mm (% in.) in white on a red background.

690.56. Insert the following Informational Note after the section title and before 690.56(A):

Informational Note: The Massachusetts Comprehensive Fire Code, 527 CMR 1.00, requires signage adjacent to the building or service disconnect that provides contact information and identifies the party responsible for the operation of the PV system.

Article 691. Delete this article.

682.2. Insert a new definition as follows:

Pier. A structure extending over the water and supported on a fixed foundation, or on flotation, that provides access to the water.

682.15. Revise to read as follows:
682.15 Ground-Fault Protection. Ground-fault protection shall be provided in accordance with (A) and (B).
(A) Receptacles. Fifteen- and 20-ampere single-phase, 125-volt through 250-volt receptacles installed outdoors and in or on floating buildings or structures within the electrical datum plane area shall be provided with GFCI protection for personnel. The GFCI protection device shall be located not less than 300 mm (12 in.) above the established electrical datum plane.
(B) Feeder and Branch Circuit Conductors. Feeder and branch circuit conductors that are installed on piers shall be provided with ground-fault protection set to open at currents exceeding 30 mA. Coordination with downstream ground-fault protection shall be permitted at the feeder overcurrent protective device.

Exception: Transformer secondary conductors of a separately derived system that do not exceed 3 m (10 ft) and are installed in a raceway shall be permitted to be installed without ground-fault protection. This exception shall also apply to the supply terminals of the equipment supplied by the transformer secondary conductors.

700.10. Make the following three revisions:"
I. Revise (D) to read as follows: "Emergency systems shall meet the additional requirements in (D)(1) through (D)(3)."
II. Revise (D)(1) by deleting (1) and renumbering the remaining numbered items accordingly.
III. Revise the resulting (D)(1)(2) to read as follows: "The cable or raceway is a listed fire-resistive cable system with a minimum two-hour fire rating."

Article 691. Delete this article.

700.10(D). Revise as follows:
I. Insert the following title and parent wording:

Fire Protection. Emergency systems shall meet the additional requirements in 700.10(D)(1) through (D)(3).

II. Delete (D)(1); renumber (D)(2) through (D)(4) as (D)(1) through (D)(3).
III. Delete (1) in the resulting (D)(1); renumber (2) through (5) as (1) through (4).
700.12. Add an exception after the first paragraph as follows:

Exception: A fire pump shall be permitted to use a connection ahead of the service disconnecting means in accordance with 695.3(A)(1).

700.12(F)(2)(2). Delete the second sentence that reads:

Flexible cord- and plug-connection shall be permitted provided that the cord does not exceed 900 mm (3 ft) in length.

701.12(G). Delete the second sentence of the second paragraph which reads:

Flexible cord- and plug-connection shall be permitted provided that the cord does not exceed 900 mm (3 ft) in length.

700.12(I)(2)(2). Delete the second sentence that reads:

Flexible cord- and plug-connection shall be permitted provided that the cord does not exceed 900 mm (3 ft.) in length.

701.12(J). Delete the second sentence of the second paragraph which reads:

Flexible cord- and plug-connection shall be permitted provided that the cord does not exceed 900 mm (3 ft.) in length.

725.2. Insert a new definition and informational note as follows:

Nominal Current. The designated current per conductor as specified by equipment design.

Informational Note: One example of nominal current is 4-pair Power over Ethernet (PoE) applications based on IEEE 802.3-2015, IEEE Standard for Ethernet, that supplies current over 2 or 4 twisted pairs. The nominal current for 60-watt PoE power-sourcing equipment is 0.3 amperes per conductor, where the current in one conductor can be 0.36 amperes and another conductor can be 0.24 amperes.

725.121(C). Revise to read as follows:
725.121(C) Marking. The power sources for limited power circuits in 725.121(A)(3) and limited power circuits for listed audio/video, information, and communications technology (equipment), and listed industrial equipment in 725.121(A)(4) shall have a label indicating the maximum voltage and maximum current or maximum voltage and nominal current output for each connection point. Where multiple connection points have the same rating, a single label shall be permitted to be used. The effective date shall be January 1, 2018.

Exception: Marking shall not be required for power sources providing 0.3 amperes nominal current or less per conductor.

725.144(A). Revise to read as follows:
725.144(A) Use of Class 2 or Class 3 Cables to Transmit Power and Data. Where Types CL3P, CL2P, CL3R, CL2R, CL3, or CL2 transmit power and data, the ampacity ratings in Table 725.144 shall apply to the nominal current at an ambient temperature of 30°C (86°F). For ambient temperatures above 30°C (86°F), the correction factors of 310.15(B)(2) shall apply.

Exception: Compliance with Table 725.144 shall not be required for installations where the nominal current does not exceed 0.3 amperes in any conductor.

725.144(B). Revise the first paragraph to read as follows:
725.144(B) Use of Class 2-LP or Class 3-LP Cables to Transmit Power and Data. Types CL3P-LP, CL2P-LP, CL3R-LP, CL2R-LP, CL3-LP, or CL2-LP shall be permitted to supply power to equipment at a current level up to the marked ampere limit located immediately following the suffix LP and shall be permitted to transmit data to the equipment. For ambient temperatures above 30°C (86°F), the correction factors of 310.15(B)(2) shall apply. The Class 2-LP and Class 3-LP cables shall comply with the following, as applicable:
770.110(A)(2). Revise to read as follows:
770.110(A)(2) Communications Raceways. Optical fiber cables shall be permitted to be installed in plenum communications raceways, riser communications raceways, and general-purpose communications raceways selected in accordance with Table 800.154(b), listed in accordance with 800.182, and installed in accordance with 800.113 and 362.24 through 362.56, where the requirements applicable to electrical nonmetallic tubing (ENT) apply.
840.2. Insert a new definition and informational note as follows:

Nominal Current. The designated current per conductor as specified by equipment design.

Informational Note: One example of nominal current is 4-pair Power over Ethernet (PoE) applications based on IEEE 802.3-2015, IEEE Standard for Ethernet, that supplies current over 2 or 4 twisted pairs. The nominal current for 60-watt PoE power-sourcing equipment is 0.3 amperes per conductor, where the current in one conductor can be 0.36 amperes and another conductor can be 0.24 amperes.

840.160. Revise to read as follows:
840.160 Powering Circuits. Communications cables, in addition to carrying the communications circuit, shall also be permitted to carry circuits for powering communications equipment. Installations of listed communications cables shall comply with 725.144 where listed communications cables are used in place of Class 2 and Class 3 cables.

Exception: Compliance with 725.144 shall not be required for installations of listed 4-pair communications cables where the nominal current does not exceed 0.3 amperes in any conductor.

Notes

Amended by Mass Register Issue 1270, eff. 9/26/2014. Amended by Mass Register Issue 1329, eff. 12/30/2016. Amended by Mass Register Issue S1331, eff. 12/30/2016. Amended by Mass Register Issue 1344, eff. 12/30/2016. Amended by Mass Register Issue 1372, eff. 8/24/2018. Amended by Mass Register Issue 1407, eff. 12/27/2019. Amended by Mass Register Issue 1420, eff. 6/10/2020. Amended by Mass Register Issue 1427, eff. 9/10/2020.

REGULATORY AUTHORITY

527 CMR 12.00: M.G.L. c. 143, § 3L.

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