NFPA 110 Standard Overview on Generator Requirements
Understand NFPA 110 generator requirements for emergency and standby power systems. Learn about generator ratings, transfer switches, and crucial installation guidelines.
The generator cabling is not a service. Only the utility can be a service. “The point of connection between the facilities of the serving utility and the premises wiring.” The definition of service was modified for the 1999 Code to state that electric energy to a service can be supplied only by the serving utility.
For generators located outside, the remote stop station must be located anywhere outside of the generator enclosure. The code does not limit the quantity of remote stop stations to one. Multiple remote stop stations may be provided, but at least one must satisfy the minimum requirements of the code.
If generator synchronizing switchgear is part of the system, the remote stop station may be located on the switchgear as a dedicated stop station. When the remote stop station is not located immediately outside the emergency generator room, a placard should be installed to indicate where the remote stop station is located.
These requirements include such things as where generators can be installed, nameplate markings, conductor ampacity, and disconnecting means. Generators are basically motors that operate in reverse—they produce electricity when rotated, instead of rotating when supplied with elec-tricity.
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