Operation
26 MMG75D-100D Operating Manual 33701 C
Figure 3-4. Transfer Switch Operation
DANGER
FAILURE TO ISOLATE THE GENERATOR FROM THE NORMAL POWER UTILITY CAN
CAUSE POTENTIALLY LETHAL VOLTAGE TO BACKFEED INTO THE UTILITY LINES.
THIS WILL RESULT IN INJURY OR ELECTROCUTION OF UTILITY WORKERS NEARBY.
MAKE SURE THE GENERATOR IS ISOLATED BY A TRANSFER SWITCH FROM ANY
LOCAL UTILITY LINES. THIS ALSO APPLIES IF THE GENERATOR IS BEING USED
AS A BACKUP TO SOME OTHER TYPE OF POWER SUPPLY.
Installation of such devices must be performed by following all directions supplied by the manufacturer of the switch.
If attaching the unit to a power supply normally serviced by a utility company, notify the utility company and check
state and local regulations. Familiarize yourself with all instructions and warning labels supplied with the switch.
WARNING
ONLY a licensed electrician should perform wiring and related connections to the
generator. Installation should be in compliance with the National Electrical Code
(NEC), state and local regulations. Failure to follow these procedures could result in
property damage, personal injury or death. Before any connections are attempted,
make sure the main circuit breaker and the Control Power switch are in the OFF (O)
position and that the negative (-) battery cable has been disconnected from the battery.
When using the unit as a standby or substitute power supply, make sure the output voltage
and phase rotation of the generator match those of the local power utility. Improper voltage
or phase rotation may cause equipment damage or malfunction.
DERATING FOR ALTITUDE
All units are subject to derating for altitude; this will reduce the available power for operating tools and accessories
connected to the receptacles. Typical reductions in performance are 5% above 10,000 ft (3048 m) of elevation.
Incoming
Utility
Power
Utility
Meter
Transfer
Switch
Main
Distribution Panel
(Utility Power)
Emergency
Distribution Panel
(Generator Power)
Power From
Generator
WHITE = Incoming
Utility Power
GRAY = Normal Utility
Power Circuit
BLACK = Emergency
Generator Power Circuit
00206
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