I have never designed a space that involved theatre lighting before so I am hoping somebody reading this could clarify. The theatre lighting consultant had mentioned that theatre lighting has a diversity factor of 50%, what does this mean for the electrical calculation on the panel...do I size a 20A circuit and then only use half of the allowed wattage in my calculation? Does the NEC mention this anywhere, I have not been able to find it.
Diversity of Theatre lighting
- Thread starter jself
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bphgravity
Senior Member
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Re: Diversity of Theatre lighting
The term "diversity" only shows up once in the NEC back in Annex B, but is not generally used. The more proper term would be "demand". I am not aware of a 50% demand factor for theater lighting.
The term "diversity" only shows up once in the NEC back in Annex B, but is not generally used. The more proper term would be "demand". I am not aware of a 50% demand factor for theater lighting.
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- Retired Electrical Engineer
Re: Diversity of Theatre lighting
Do you think they might be trying to take advantage of 520.27(C)? If they are asserting that only 50% of the stage lights will be on at a time, and wish you to factor that into the "maximum load that the switchboard is intended to control in a given installation," it might be OK. But look at the constraints that follow this article.
Do you think they might be trying to take advantage of 520.27(C)? If they are asserting that only 50% of the stage lights will be on at a time, and wish you to factor that into the "maximum load that the switchboard is intended to control in a given installation," it might be OK. But look at the constraints that follow this article.
Re: Diversity of Theatre lighting
Thats what I thought, I called the designer that mentioned the load up and he said that he remembers that distinctivley in his electrical fundementals as something refering to the NEC, however he is a layman when it comes to the actual word of the code.
I gave him that theory and he didn't have an argument for it.
Thats what I thought, I called the designer that mentioned the load up and he said that he remembers that distinctivley in his electrical fundementals as something refering to the NEC, however he is a layman when it comes to the actual word of the code.
I gave him that theory and he didn't have an argument for it.
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