Routings for Power-Limited and Non-Power-Limited Wiring
P/N 06-237058-001 E-1 February 2012
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 and Figure E-2 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-3 shows typical
wiring for power-limited and non-power-limited circuits in a 2-Tiered Enclosure with location of
knockouts also noted.
Figures E4 through E6 are photographs of an ARIES NETLink 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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