02-658 C.M.R. ch. 13, § 8 - Electrical Wiring and Equipment

Current through 2022-14, April 6, 2022

13.8.1 Code Compliance; General Requirements

The following requirements must be met with respect to the electrical wiring and equipment used in connection with propane or natural gas burning equipment:

1. The electrical wiring and equipment used must be installed in accordance with NFPA #70, National Electrical Code(2011 edition);
2. Safety control circuits must be two-wire, one side grounded, having a nominal voltage not exceeding 150 Volts. A safety control or protective device must be connected so as to interrupt the ungrounded conductor; and
3. The control circuit must be connected to a power supply branch circuit fused at not more than the value appropriate for the rating of any control or device included in the circuit.
13.8.2 Emergency Switch
13.8.2.1 For central heating equipment and water heating appliances where the interruption of an electrical circuit will arrest the combustion process, an identified emergency shutdown switch must be placed outside of and adjacent to the entrance of the room where the appliance is located.
13.8.2.2 An emergency switch shall not be placed out side of any building.
13.8.2.3 If the entrance to the boiler room is only accessible from the outside, the emergency switch may be place date the inside not more than one foot beyond the door opening.
13.8.2.4 On multi-unit installations of commercial and industrial equipment, the emergency switch must be installed in accordance with Figure13-1.
13.8.2.5 On multi-unit installations in other than one- and two-family residences, the emergency shut-off switch must be placed at the outside entrance of the room containing the appliances. The emergency switches and the thermal cut-off switches must be wired in series through individual unit relays so that, if the emergency switch is opened, all heating equipment in the room and any electrically operated gas valves will be rendered inoperable. This application also applies if there are two or more appliance rooms in the same building that are connected to a common fuel supply system.

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13.8.3 Service Switch

For central heating equipment and water heating appliances where the interruption of an electrical circuit will arrest the combustion process, a service disconnect switch for control of the burner while observing the flame must be placed at the unit, within 3 of the burner.

13.8.4 Thermal Cut-Off Switches
13.8.4.1 For central heating equipment and water heating appliances where the interruption of an electrical circuit will arrest the combustion process, athermalcut-off switch must be wired in to the burner circuit to shut off the burner in the event of a fire at the unit. The switch must be placed at the highest point directly above the unit to be fired with the ther male lement pointed downwards, and must be placed on the bottom of the floor joist or stringer at the front of the unit. In no cases hall it be lower than the point where the flue connect or enters the chimney. The switch must be wired to shut off the burner, circulating fan, forced or induced draft fan and any electrically-operated gas valves. Athermale lectric switch is required for each electrically-powered gas-fired unit in a multi-appliance installation.
13.8.4.2 On multi-unit installations other than one- and two-family residences the emergency and ther male lectrical switches must be wired in series through individual unit relays so that, if one switch is opened, all equipment will be rendered inoperable whenever the "EMERGENCY" switch is opened.
13.8.5 Controls Containing Mercury

Thermostats containing mercury must be disposed of according to all federal and state regulations. (Refer to 38 MRSA §1663 and check with your local supplier.)

Notes

02-658 C.M.R. ch. 13, § 8

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