Siemens 3PCI Series, Operation Manual

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Installation 3PCI SCR Power Controller Series Manual
2-2
s
Version 1.2 (19000325)
Wiring rated at 75°C is required for all 3PCI model current ratings.
The 3PCI is phase-rotation insensitive. That is, three-phase input power can be connected in any
sequence to terminals
L1
,
L2
, and
L3
, and will not cause an out-of-phase condition.
Warning! Branch circuit overcurrent protection required is to be provided in accordance with the
national and local codes of the inspecting authority.
AC Input
Load
3
2
1
3
2
1
Figure 2-1. Typical 3PCI Line and Load Connections
Table 2-1. Wire Size Information
Current Rating Smallest Allowable
Conductor Size
Largest Allowable
Conductor Size
60, 90 and 120 A 8 AWG 0 AWG
180 and 255 A 6 AWG 250 MCM
1
350 through 1,200 A n/a n/a
1 - 1 MCM = 1000 CM (circular mils)
*
*
Terminal
Terminal