Miller Electric 251 NT manual Typical Connections To Supply Standby Power, 240 120 Ground

9-10. Typical Connections To Supply Standby Power

.Customer-supplied equipment is required if generator is to supply standby power during emergencies or power outages.

1

1Power Company Service Meter

2Main and Branch Overcurrent Protection

3Double-Pole, Double-Throw Transfer Switch

Obtain and install correct switch. Switch rating must be same as or greater than the branch overcurrent protection.

4Circuit Breakers or Fused Disconnect Switch

120/240 Volt

60Hz

Three-Wire Service

2

Load

7

6

120/240 Volt

Single-Phase

Three-Wire

Generator Output

Connection

240 V		Obtain and install correct circuit
		breakers or switch.
120 V		5	Extension Cord
		Select as shown in Section 9-11.
120 V
		6	Generator Connections
Neutral		Connect terminals or plug of ade-
		safety practices.
		quate amperage capacity to cord.
	3	Follow all applicable codes and
240 V		Turn off or unplug all equipment
		connected to		generator before
		starting or stopping engine. When
120 V		starting or stopping, the engine has
		low speed which causes low volt-
120 V		age and frequency.
		7	Load Connections
	4
CB
or		Item 4 is not necessary if circuit
F1		protection is already present in
		welding	generator	auxiliary
		power output circuit.
	5
240 V
120 V
120 V
Ground

S-0405-A

OM-486 Page 37