Siemens Industry, Inc.
Building Technologies Division
A6V10328630_en--_b
8
When installing power limited field wiring, the installer must comply with NEC article
760, which states:
The fire alarm power-limited circuits are installed using Types FPL, FPLR, FPLP or
permitted substitute cable, provided these power-limited cable conductors extending
beyond the jacket are separated by a minimum of 0.25 in. (6.35 mm) or by a noncon-
ductive sleeve or nonconductive barrier from all other conductors.
If energy limited cable or equivalent is not used within the enclosure, then the following
guidelines do not apply. In that case, be sure to follow standard wiring practices.
Wiring Entering Enclosure
Non-Power Limited Wiring
Wiring entering the enclosure from the bottom and right side of the backbox is
considered non-power limited wiring. Wiring must be in the shortest route and must
not overlap any other wiring.
Power Limited Wiring
Wiring entering the enclosure from the top and the left side of the backbox is
considered power limited. Wiring must be in the shortest route and must not overlap
any other wiring.
Use the existing lances in the backbox to dress the wires as needed to maintain
separation of power limited and non-power limited wiring.
Use the existing lances on the adapter plate to dress the wires as needed to main-
tain separation of power limited and non-power limited wiring.
Install Wiring
The primary mains input must have a separate or dedicated circuit breaker. Wire in
accordance with local codes and Article 760 of NEC.
1.
Remove the knockouts in the backbox for the entry of field wiring.
2.
Pull all field wiring into the backbox. Do not dress the wiring until the
location of all the equipment is known.
3.
Install the wiring from the external power source to the approximate
location of the power supply.
