NEC 2017 Article 700.3(F)

[hhsting]

I have emergency system and the engineer of this project is providing Asco series 300 dual purpose quick connect power panel for NEC 2017 Article 700.3(F). See below snapshot from engineering drawing and from manufacturer datasheet.

Does anyone familar with this equipment know why they have male camlock and female camlock? If the Male
Camlock is used for temp generator then what is female camlock used for? I am just confuse.

Engineer drawing snapshot:

Manufacturer datasheet:

 

[don_resqcapt19]

The female camlocks are for load testing of the generator. You connect the load bank and manually start the generator.

 

[hhsting]

The female camlocks are for load testing of the generator. You connect the load bank and manually start the generator.

I dont see how permanent generator can be used for load testing from female camlock since their is interlock between permanent generator main breaker and the male camlock? If you connect temp generator in male camlock and interlock would open permanent main generator breaker. How can you use female camlock for permanent generator load testing?

 

[tom baker]

If it’s listed asco product there is no issue

 

[don_resqcapt19]

I dont see how permanent generator can be used for load testing from female camlock since their is interlock between permanent generator main breaker and the male camlock? If you connect temp generator in male camlock and interlock would open permanent main generator breaker. How can you use female camlock for permanent generator load testing?

Pay attention to the drawing...the female camlocks are directly connected to the output conductors from the generator. With the transfer switch in the normal position, a manual start of the generator, any load connected to the female camlocks would be supplied by the generator. The interlock has nothing to do with the connection to the female camlocks. Even while the permanent generator is being load tested, it is still available to supply power to the emergency loads if the transfer switch would operate. In this case the person doing the load testing would immediately disconnect the test load from the generator, using the disconnect switch on the test load, so that all of the generator power is available to supply the emergency loads.
The male camlocks are to provide a way to connect a temporary generator to the system so that the permanent generator can be taken out of service for maintenance. In this case the output of the generator is isolated from the system. The kirk key at the generator breaker can only be removed with the generator breaker in the open position. That key is then used to open the cover at the male camlocks to permit the temporary generator to be connected to the system. The temporary generator is either left running while the permanent generator is being worked on, or the transfer switch generator start contacts are connected to the temporary generator.

This is how all emergency generators should be installed, but they are not required to be installed in this manner by the code.