Routings for Power-Limited and Non-Power-Limited Wiring
P/N 06-237041-001 E-1 February 2011
APPENDIX E
ROUTINGS FOR POWER-LIMITED AND NON-POWER-
LIMITED WIRING
This appendix provides guidelines for power-limited and non-power-limited wiring requirements.
The following wiring requirements shall be observed:
• Power-limited and non-power-limited wiring must be physically separated within the control unit
enclosure.
• All power-limited wiring must be separated by at least 1/4-inch (6 mm) from any
non-power-limited wiring.
• Non-power-limited wiring must be placed inside a conduit.
• Power-limited and non-power-limited wiring cannot enter and exit the control unit enclosure
through the same knockout or conduit.
• Cables from switching power supply units must be kept a minimum of 1/4-inch (6 mm) away
from field wiring coming into the Main Controller Board (MCB) and any installed Expansion
Cards.
• Location of expansion cards in the Expansion Card Cage, combined with configuration of their
output circuits (available optionally for either power-limited or non-power-limited applications),
MUST take into consideration maintaining minimally 1/4-inch of separation between wiring to
these circuits.
Figure E-1 shows wiring from the Audible PMU Trouble Sounder to the PMU Board. Figure E-2 and
Figure E-3 show examples of typical wiring for power-limited and non-power-limited circuits in a
3-Tiered Enclosure and location of enclosure knockouts. Figure E-4 shows typical wiring for power-
limited and non-power-limited circuits in a 2-Tiered Enclosure with location of knockouts also noted.
Figures E5 through E7 are photographs of a FenwalNET 8000-ML control unit where standard
electrical tie wraps and clamps, in addition to the enclosure’s standoffs, brackets and card cage
frame, are used to properly dress power-limited and non-power-limited wiring with the required
1/4-in. minimum separation.
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