II. Circuit Wiring
700.10 Wiring, Emergency System.
(B) Wiring. Wiring of two or more emergency circuits supplied
from the same source shall be permitted in the same
raceway, cable, box, or cabinet. Wiring from an emergency
source or emergency source distribution overcurrent protection
to emergency loads shall be kept entirely independent of
all other wiring and equipment, unless otherwise permitted in
(1) through (5):
(1) Wiring from the normal power source located in transfer
equipment enclosures
(2) Wiring supplied from two sources in exit or emergency
luminaires
(3) Wiring from two sources in a listed load control relay
supplying exit or emergency luminaires, or in a
common junction box, attached to exit or emergency
luminaires
(4) Wiring within a common junction box attached to unit
equipment, containing only the branch circuit supplying
the unit equipment and the emergency circuit supplied
by the unit equipment
(5) Wiring from an emergency source to supply any combination
of emergency, legally required, or optional loads in
accordance with (a), (b), (c), and (d):
a. From separate vertical switchboard sections, with or
without a common bus, or from individual disconnects
mounted in separate enclosures.
b. The common bus or separate sections of the switchboard
or the individual enclosures shall be permitted
to be supplied by single or multiple feeders without
overcurrent protection at the source.
Exception to (5)(b): Overcurrent protection shall be permitted
at the source or for the equipment, provided the overcurrent
protection complies with the requirements of 700.27.
c. Legally required and optional standby circuits shall
not originate from the same vertical switchboard
section, panelboard enclosure, or individual disconnect
enclosure as emergency circuits.
d. It shall be permissible to utilize single or multiple
feeders to supply distribution equipment between an
emergency source and the point where the combination
of emergency, legally required, or optional loads
are separated.
