Confused

[electricelmo]

Having trouble finding information on how to calculate the service size for a tanning salon. Equipment longest run cycle is 20 minutes which makes it a noncontinues load. Can't find anything in code book on what to clasify or if there is any demand factor for tanning beds.

 

[ykee]

There are likely multiple beds, and I wouldn't imagine that they would need any down time, so it is possible that they could be in pretty much continuous use, so I'd use that for any assumptions about the beds.

 

[kingpb]

This topic has come up before, you can look in the archives for the topic. I believe the consensus was to assume no diversity, and that they are continuous.

Could you imagine if little Sally's tanning session was interrupted by a breaker trip. She would be hysterical. You don't want that on your conscious do you?

 

[infinity]

I don't see how those loads can be considered continuous. No one would survive three hours in a tanning bed.

 

[iwire]

Ditto what Kingpb had to say, the NEC does not have any tables for that and if you ask the owner of the salon I bet they want to be able to book sessions on all beds at the same time.

Yeah, it means a big, expensive service with a large monthly bill. That is what happens to any business who's primary energy source is electricity.

 

[Mr. Bill]

I would calculate it as a lighting load. 100% non-continuous. It is possible for all of the beds to be on at one time so size the branch circuits and service accordingly.

It is not possible for any bed to be on for 3 hours non stop. All beds are connected to timers. And there's always the user's dress and undress time needed between use.