Toshiba 431B Manuale Utente

4300 Series Ancillary Cabinets Installation and Operation Manual

12.4 INSTALLATION INSTRUCTIONS

DANGER: HAZARDOUS VOLTAGES MAY EXIST.

Verify all power is removed from the UPS and power cables prior connecting the power cables to

the Auxiliary Cabinet terminals, Maintenance Bypass Switch terminals, or UPS terminals.

The Toshiba Maintenance Bypass Cabinet (431M) can be used in either of two arrangements:

• 431M with the 4300 UPS,

• 431A with the 431M and the 4300 UPS.

431M with 431A and 4300 UPS

Select the proper cable size per Table 12.1.

Table 12.1 - 431M Input/Output Power Cable Sizes

(

Cable sizes for 75°C Copper Cable)

Recommended/Maximum Wire size and Torque Requirement

UPS

Rating

Output Current Ampacity (Four conductors

in conduit)

Phase AWG* Neutral AWG* Tightening

Torque

30 kVA

75 A

117

1 - 250 kcmil

3/0 - 350 kcmil

200 in.-lbs.

50 kVA

125 A

188

3/0 - 250 kcmil

350 kcmil

200 in.-lbs.

* Wire capacity for Phase lugs is 250 kcmil - 6 AWG, Neutral lugs is 350 kcmil - 6 AWG.

Terminate the cable end connecting to the 431M with 0.5 inch bolt hole terminal lugs. See Table 12.2 for recom-

mended torque, and Table 12.3 for examples of NEMA 2-Hole terminations.
The 431M Circuit Breakers are equipped with terminal bus strips pre-drilled in a standard NEMA 2-hole pattern

(0.5 in. bolt holes on 1.75 in. centers) to facilitate installation of power cables. Use of NEMA two-hole cable termi-

nations is recommended.