Mich. Admin. Code R. 408.30536a - General requirements
Rule 536a.
Sections E3402.2, E3405.2 and E3407.5 are amended to read as follows:
E3402.2. Penetrations of
fire-resistance-rated assemblies. Electrical installations in hollow spaces,
vertical shafts, and ventilation or air-handling ducts shall be made so that
the possible spread of fire or products of combustion will not be substantially
increased. Electrical penetrations through fire-resistance-rated walls,
partitions, floors, or ceilings shall be protected by approved methods to
maintain the fire-resistance-rating of the element penetrated. Penetrations of
fire-resistance-rated walls shall be limited as specified in Section
R302.4.
E3405.2. Working clearances
for energized equipment and panelboards. Except as otherwise specified in
chapters 34 through 43, the dimension of the working space in the direction of
access to panelboards and live parts likely to require examination , adjustment,
servicing, or maintenance while energized shall be not less than 36 inches (914
mm) in depth. Distances shall be measured from the energized parts where such
parts are exposed or from the enclosure front or opening where such parts are
enclosed. In addition to the 36-inch dimension (914 mm), the work space shall
not be less than 30 inches (762 mm) wide in front of the electrical equipment
and not less than the width of such equipment. The work space shall be clear
and shall extend from the floor or platform to a height of 6.5 feet (1 981 mm)
or the height of the equipment, whichever is greater. In all cases, the work
space shall allow at least a 90-degree (1.57 rad) opening of equipment doors or
hinged panels. Equipment associated with the electrical installation located
above or below the electrical equipment shall be permitted to extend not more
than 6 inches (152 mm) beyond the front of the electrical equipment.
[110.26(A)]
Exception:
1. In
existing dwelling units, service equipment, and panelboards that are not rated
in excess of 200 amperes may be in spaces where the height of the working space
is less than 6.5 feet (1 981 mm), but greater than 5 feet (1 524 mm).
[110.26(A)(3) Exception 1 amended]
2. Meters that are installed in meter sockets
may extend beyond the other equipment. Meter sockets shall not be exempt from
the requirements of this section. [110.26(A)(3) Exception 2] E3407.5. Polarity
of connections. No grounded conductor shall be attached to any terminal or lead
so as to reverse the designated polarity.
Notes
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