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InfraStruXure System—Installation and Start-Up 11
Electrical Requirements and Specifications
Procedures requiring a licensed electrician
Electrical requirements
Electrical
Hazar
d
Procedures requiring a licensed electrician include:
• Connection of utility conductors
• Installation of a 350-, 150-, or 125-amp circuit breaker
• Connection to the Main Input switch
• Connection to a branch circuit
• Connection to the cross tie output breaker
See als
o
To connect utility conductors, see Certified Electrician’s Instructions (990-1469A)
included with your InfraStruXure PDU documentation.
208VAC 480VAC 600VAC
Upstream circuit breaker
† ‡
350A 150A 125A
Conductors to Main Input switch
† ‡*
3W + G, 4W + G
*
3W + G + GEC to building steel
Conductors to the Bypass Input switch
† ‡
4W + G
Conductors to the Cross Tie Output
breaker
† ‡
4W + G
Recommended wire sizing
‡
L1, L2, L3 400kcmil (350A) 1/0AWG (150A) 2AWG (125A)
N
*
400kcmil 1/0AWG 2AWG
G 3 AWG 6 AWG 6 AWG
GEC 1/0AWG 6 AWG 8 AWG
Torque according to wire size
L1, L2, L3 Underfloor Wiring: 500in-lbs, Overhead Wiring: 160in-lb
(18Nm) of lugs onto the circuit breaker
N 125in-lb
G, GEC 45in-lb if single terminal (ground), 50in-lb if double terminal
(G + GEC)
* Transformerless PDUs only.
† Provided by customer.
‡ Consult local and national codes for sizing requirements.