Miller Electric Big Blue 251D - Manual (Page 45)

OM-480 Page 41
11-10. Typical Connections To Supply Standby Power
Y Have only qualified persons perform
these connections according to all
applicable codes and safety practic-
es.
Y Properly install and ground this
equipment according to its Owner’s
Manual and national, state, and local
codes.
.
Customer-supplied equipment is re-
quired if generator will supply standby
power during emergencies or power out-
ages.
1 Utility Electrical Service
2 Transfer Switch (Double-Throw)
Switch transfers the electrical load from
electric utility service to the generator. Trans-
fer load back to electric utility when service is
restored.
Install correct switch (customer-supplied).
Switch rating must be same as or greater
than the branch overcurrent protection.
3 Fused Disconnect Switch
Install correct switch (customer-supplied) if
required by electrical code.
4 Welding Generator Output
Generator output voltage and wiring must be
consistent with regular (utility) system volt-
age and wiring.
Connect generator with temporary or perma-
nent wiring suitable for the installation.
Turn off or unplug all equipment connected to
generator before starting or stopping engine.
When starting or stopping, the engine has
low speed which causes low voltage and
frequency.
5 Essential Loads
Generator output may not meet the electrical
requirements of the premises. If generator
does not produce enough output to meet all
requirements, connect only essential loads
(pumps, freezers, heaters, etc. − See Sec-
tion 11-4).
Y Properly install and ground this equipment according to
its Owner’s Manual and national, state, and local codes.
Transfer Switch
Essential
Loads
Fused
Disconnect
Switch
(If Required)
Utility
Electrical
Service
1 2 3 4
5
Welding
Generator
Output
Notes
Work like a Pro!
Pros weld and cut
safely. Read the
safety rules at
the beginning
of this manual.