240.24(E) interpretation (2017 NEC)

[Fred B]

240.24(E) states that regarding overcurrent protection shall not be located in a bathroom, other than supplemental overcurrent protection. Never noticed that added exception. Does that allow for a "subpanel" to be in the bathroom? Or what would an example of a supplemental overcurrent protection be?

 

[petersonra]

240.24(E) states that regarding overcurrent protection shall not be located in a bathroom, other than supplemental overcurrent protection. Never noticed that added exception. Does that allow for a "subpanel" to be in the bathroom? Or what would an example of a supplemental overcurrent protection be?

Ul 1077 covers supplementary protectors. Usually used to protect a specific device as opposed to a circuit. So it could be something built in to a device.

 

[retirede]

IMO, the breakers in a subpanel are primary OCP for branch circuits originating there and cannot be considered supplementary.

An example of supplementary would be a fuse commonly located at a gas furnace disconnect switch. The branch circuit is already protected at its ampacity, so the fuse is supplementary.

 

[Fred B]

Thanks, had someone argue that they could put a subpanel in the bathroom trying to use that section and I've never noticed that little piece. I didn't think that would be allowed but couldn't think of an example of what IS a "supplemental overcurrent protection".

 

[Fred B]

So it could be also be the fusible switch used in like an AC Compressor?

 

[petersonra]

So it could be also be the fusible switch used in like an AC Compressor?

No

 

[infinity]

Thanks, had someone argue that they could put a subpanel in the bathroom trying to use that section and I've never noticed that little piece. I didn't think that would be allowed but couldn't think of an example of what IS a "supplemental overcurrent protection".

I agree. That would be a stretch.

 

[don_resqcapt19]

The most common supplemental overcurrent protection that I have come across is the fuses sometimes specified in luminaires with ballasts to keep the branch circuit OCPD from opening when the ballast fails.

Note that where the code requires OCPD, it must be suitable for use as "branch circuit overcurrent protection". OCPDs that are marked "supplemental overcurrent protection" are not permitted to provide the protection that the code requires for branch circuits.

 

[Dennis Alwon]

240.24(E) states that regarding overcurrent protection shall not be located in a bathroom, other than supplemental overcurrent protection. Never noticed that added exception. Does that allow for a "subpanel" to be in the bathroom? Or what would an example of a supplemental overcurrent protection be?

If you are in a building other than those mentioned, ie a commercial area bathroom, then you can have a sub panel in the bathroom. The nec does not allow service equipment in the bathrooms of these other places.