Nfpa 110

[jmd445]

What are the differences (Definitions) between an Emergency Generator and a Stand-by Generator? NFPA refers to Level 1 and level 2 but I can find where it defines Emergency and Stand-by.

Is level I Emergency and Level 2 Stand-by or is there still another classification?

This I know :

4.4* Level.

This standard recognizes two levels of equipment installation, performance, and maintenance.

4.4.1* Level 1 systems shall be installed when failure of the equipment to perform could result in loss of human life or serious injuries.

4.4.2* Level 2 systems shall be installed when failure of the EPSS to perform is less critical to human life and safety and where the authority having jurisdiction shall permit a higher degree of flexibility than that provided by a Level 1 system.

4.4.3 All equipment shall be permanently installed.

Jim

 

[Mr. Bill]

A generator can either be Prime power or Stand-By power. Most manufacturers have different power capacities for these. Prime power means that it is the prime source of power, usually running continuously. Stand-By generator means there is another source that is prime and the generator will only start when the prime source fails.

It's possible for an emergency generator to be Prime power or Stand-By power. I think it's safe to call an emergency generator the same as a Level 1 generator. Typical loads on a Level 1 generator is the fire pump, emergency lighting, and the emergency system in a health care facility.

 

[iwire]

As far as the NEC is concerned I would look at 700.1, 701.1 and 702.1.

Those are the scopes of Article 700, 701 and 702.

A generator supplying the loads under the scope of 700 is an 'Emergency Generator'.

A generator supplying loads under the scope of 701 or 702 is a 'standby generator'.