Electrical Installation
Table 2. Recommended Wire Sizes
Input Circuit Breaker Size | 75°C Copper Wire Size | Conductor Screw Torque |
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25A | 10 AWG (5.3 mm2) | 20 in lb (2.3 Nm) | |
40A | 8 AWG (8.4 mm2) | 25 in lb (2.8 Nm) | |
60A | 4 AWG (21.2 mm2) | 35 in lb (4.0 Nm) | |
80A | 3 AWG (26.7 mm2) | 45 in lb (5.1 Nm) | |
100A | 2 AWG (42.1 mm2) | 55 in lb (6.2 Nm) | |
125A | 1/0 AWG (53.5 mm2) | 65 in lb (7.3 Nm) | |
FOR U.S. INSTALLATIONS, READ THIS IMPORTANT NOTE!
This table lists the AWG and mm2 wire size for each circuit breaker size shown on the wiring diagrams. The minimum recommended circuit breaker sizes for each model and voltage application are listed on the wiring diagrams.
Conductor sizes shall be no smaller than the 75°C wire size based on the ampacities given in Table 31016 of the National Electrical Code, ANSI/NFPA
Bypass switches are available in two types:
An MBB switch makes a new connection before it breaks the original connection. For example, if you turn an MBB switch from UPS to LINE, the bypass switch connects the load to AC input power before disconnecting the load from UPS output power. (As noted in Figure 37 on page 47, MBB switches may not be used in certain system configurations.)
A BBM switch breaks the original connection before it makes a new one. If you turn a BBM switch from UPS to LINE, the switch disconnects the load from UPS output power before connecting the load to AC input power.
The bypass switch has four positions as described in Table 3.
NOTE In the UPS or LINE position, AC input power is still connected to the input terminals inside the UPS.
Powerware® 9170 User's Guide | 27 |