Inverter output OCPD

[Twoskinsoneman]

Got a situation where an inverter feeds a couple of branch ciruits.
The inverter is fed by batteries that are kept charge by utility power. When the power goes out the inverter runs the circuits for as long as the batteries last and that is it.

Does the inverter output need OCPD if the output conductors are sized of an ampacity that is greater than the outpur rating of the inverter?

 

[acrwc10]

Got a situation where an inverter feeds a couple of branch ciruits.
The inverter is fed by batteries that are kept charge by utility power. When the power goes out the inverter runs the circuits for as long as the batteries last and that is it.

Does the inverter output need OCPD if the output conductors are sized of an ampacity that is greater than the outpur rating of the inverter?

Yes, it is a separately derived source. All branch circuits need OCP. IMO

 

[bhsrnd]

DC side - In accordance with Article 480 and 240.21(H). (2008 NEC)

AC side - Anything on the load side of the inverter must have OCPD installed as per Article 240.



Is this a UPS module? If so, the installation could be subject to one of the Articles in Chapter 7.

 

[mdshunk]

I havn't really seen such an inverter in a long time that didn't have branch breakers in it already.

 

[beanland]

Ocpd

Ocpd

Code requires over current protection but cannot specify what device is used. If the inverter has built-in current limiting, it is the OCPD so a separate device may not be required.

A disconnect to isolate energy is always required.