Re: flourescent light

Posted by John T on September 15, 2006 at 07:19:27 from (66.244.90.5):

In Reply to: Re: flourescent light posted by 1 Denny on September 15, 2006 at 05:25:28:

Denny, Thanks for clarifying the 80% rule time requirements, I wasnt sure what it took for a load to be NEC considered as "continuous". I was an electrical design enginner but have been retired for some time and am rustyyyyyyyy on the NEC, but was sure of the 80% load rules for "continuous" loads just unsure of the time lol

Its actually a good rule if one considers the use of Thermal Magnetic breakers and their design. The thermal portion trips after a long sustained curent draw near its rated load while the magnetic portion is for clearing a sudden high current shorting type fault. When I built my home in 1979 the arc fault circuit breakers werent around but I may install them now

I still didnt design right up to the limit and seldom used the maximum NEC allowable current draw even considering the 80% rule, 8 to 10 lights is all I liked on a single branch circuit as switchign and zoning are other practical factors that play a role in lighting design.

Take care now

John T

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