Alpha Technologies CFR 3000, CFR 3000RM - Manual (Page 18)

2 Installation 12
The unit should be wired to dedicated circuit equipped with a properly sized circuit breaker.
The breaker’s size is the unit’s maximum input current (as given in the specifications) plus
25%.
For example if the unit draws 32.0 Amps of current at 208 VAC, adding 25% the input
current becomes 40.0 Amps. A 40 Amp circuit breaker would be OK. Always follow the
local electrical code when installing or sizing circuit breakers.
2.1.3 Standby Generator
The unit has frequency sense circuits for operation with most standby generators. Use a
generator equipped with electronic speed and voltage controls since the unstable frequen-
cies created by a mechanical governor can make the unit run continuously in line failure
mode, draining the batteries.
Before installation see that the generator’s output voltage meets the unit’s input voltage
requirements as shown on both nameplates. A 240 VAC unit must be attached to a 240
VAC generator.
2.1 Pre–Installation Checklist (Continued)