Installation Guide
26/34 94-1100-00002873 A0 EN
│
TruFit
®
Power Distribution Unit
4.9.3
Main/Power circuit installation
All wiring methods and materials must comply with the NEC and applicable local codes, and be installed by a
qualified electrician.
Cable entrance/exit is from either the top or bottom of the unit via removable conduit plates. Conduit openings
and fittings are to be provided by the installer, refer to the outline drawing for permitted opening locations.
Consult the factory if other NEC compliant methods are intended to be used for the connection of power circuits.
Wiring shall be sized in accordance with the NEC, on the basis of 75
°
C rated, copper conductors and the
applicable installation and environmental conditions; see table below for maximum recommended wire sizes and
lugs. Equipment grounding conductors shall be provided for each input and output power feed, sized in
accordance with the NEC based on the upstream overcurrent protective devices.
PDU kVA
Main CB /
upstream
OCPD Amps
Cable type
(per phase)
Thomas & Betts
Lug
Ground Cable
Thomas & Betts
Lug
50
125AF / 75AT
1 x #4
256-30695-733PH
#6
256-30695-868PH
75
125AF /
125AT
1 x 1/0
256-30695-593PH
#6
256-30695-868PH
125
250AF /
200AT
1 x 4/0
54868BEPH
#6
256-30695-868PH
150
250AF /
225AT
1 x 300kcmil
54870BEPH
#4
256-30695-733PH
225
400AF /
350AT
2 x 3/0
54864BEPH
#3
54811BEPH
300
600AF /
450AT
2 x 250MCM
54870BEPH
#1
54857BEPH
Maximum Recommended Cable Sizes and Compression Lugs - Main Breaker
Use lugs consistent with applicable codes; ABB recommends the long barrel, NEMA 2-Hole compression lugs
shown in Table 3-1 for connections to the TruFit using code stranded copper conductors. For all input and output
power circuit connections, ABB recommends using SAE Grade 5 hardware with Belleville spring washers. Always
use two (2) wrenches when tightening connections to prevent distortion or damage. Refer to Section 5.2 for
standard hardware torque specifications. Refer to individual electrical components’ labels (e.g. molded case
switches) for component specific torque specifications.
4.9.4
Control/Auxiliary circuit installation
Control wiring must comply with the NEC and applicable local codes. A qualified electrician must install all wiring.
Two suggested routes for incoming control power are shown below. Control wire & cables should be routed such
that installation and removal of barriers should not be hindered, and access to components and wiring shall not
be prevented. Installer is responsible to maintain separation between control wiring and power cables.