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

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

The Miller Electric 251 NT is a highly regarded multi-process welding machine known for its versatility and advanced features, making it an ideal choice for professionals in various industries. With its robust construction and user-friendly interface, the 251 NT provides an efficient solution for MIG, TIG, and Stick welding applications.

One of the main features of the Miller Electric 251 NT is its impressive output range, which allows for welding on a variety of materials and thicknesses. It delivers up to 250 amps of power, enabling users to tackle both thin and thick metals with ease. Additionally, the machine is equipped with an Auto-Set feature, which automatically adjusts the welding settings according to the material thickness and type. This eliminates the guesswork, significantly enhancing productivity and reducing setup time.

Another noteworthy aspect of the Miller Electric 251 NT is its inverter technology. This advanced technology provides a compact, lightweight design without compromising performance. Inverter technology allows for greater energy efficiency, resulting in reduced operational costs over time. The 251 NT also features a Duty Cycle of 60% at 250 amps, which means it can handle demanding tasks while maintaining optimal performance.

The Miller Electric 251 NT is designed with user convenience in mind. The intuitive digital display offers clear visibility of the settings, allowing welders to make quick adjustments. Furthermore, the machine includes a built-in memory function to store frequently used parameters, enhancing workflow efficiency.

Safety is a key component of the 251 NT's design. It comes equipped with various safety features, including overload protection and a thermal overload warning system. These features ensure that the machine operates within safe limits, minimizing the risk of damage and ensuring longevity.

In terms of portability, the Miller Electric 251 NT's lightweight design and integrated handle make it easy to transport between job sites. The durable housing protects the internal components, making it suitable for rigorous use in demanding environments.

Overall, the Miller Electric 251 NT offers a combination of power, flexibility, and ease of use, making it a top choice for welders looking to enhance their capabilities across multiple welding processes. Whether in a professional shop or on a construction site, the 251 NT stands out as a reliable and efficient welding solution.
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