Windsor-Severence Fire Protection District
Heavy Rescue
Production Specification
SVI #774 Page 121 of 126 April 19, 2010
Power Supply Assembly
The conductors used in the power supply assembly between the output terminals of the power source and the main
overcurrent protection device shall not exceed 12 ft (4 m) in length.
All power supply assembly conductors, including neutral and grounding conductors, shall have an equivalent amperage
rating and shall be sized to carry not less than 115 percent of the amperage of the nameplate current rating of the power
source.
If the power supply assembly connects to the vibrating part of a generator (not a connection on the base), the conductors
shall be flexible cord or other fine-stranded conductors enclosed in metallic or nonmetallic liquid tight flexible conduit rated
for wet locations and temperatures not less than 194°F (90°C).
Overcurrent Protection
Manually resettable overcurrent devices shall be installed to protect the line voltage electrical system components.
Power Source Protection
A main overcurrent protection device shall be provided that is either incorporated in the power source or connected to the
power source by a power supply assembly.
The size of the main overcurrent protection device shall not exceed 100 percent of the rated amperage stated on the
power source specification label or the rating of the next larger available size overcurrent protection device, where so
recommended by the power source manufacturer.
If the main overcurrent protection device is subject to road spray, the unit shall be housed in a Type 4–rated enclosure.
Branch Circuit Overcurrent Protection
Overcurrent protection devices shall be provided for each individual circuit and shall be sized at not less than 15 amps in
accordance with 240.4, “Protection of Conductors,” of NFPA 70.
Any panelboard shall have a main breaker where the panel has six or more individual branch circuits or the power source
is rated 8 kW or larger.
Each overcurrent protection device shall be marked with a label to identify the function of the circuit it protects.
Dedicated circuits shall be provided for any large appliance or device (air conditioning units, large motors, etc.) that
requires 60 percent or more of the rated capacity of the circuit to which it is connected, and that circuit shall serve no other
purpose.
Panelboards
All fixed power sources shall be hardwired to a permanently mounted panelboard unless one of the following conditions
exists:
1. All line voltage power connections are made through receptacles on the power source and the receptacles are
protected by integrated overcurrent devices.
2. Only one circuit is hardwired to the power source, which is protected by an integrated overcurrent device.
The panel shall be visible and located so that there is unimpeded access to the panelboard controls. All panelboards shall
be designed for use in their intended location. The panel(s) shall be protected from mechanical damage, tool mounting,
and equipment storage.
(112 Seiten)
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