lighting demand load

[techelec]

This might be an obsolete question but, if someone could please let me know where to find, in the NEC, the demand factor of 125% for lighting loads. Thank-you

 

[Dennis Alwon]

Not sure but could this be it

210.20 Overcurrent Protection.
Branch-circuit conductors and equipment shall be protected by overcurrent protective devices that have a rating or setting that complies with 210.20(A) through (D).
(A) Continuous and Noncontinuous Loads. Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.

Thus if the lighting load is continuous then you must apply the 125% RULE.

 

[wawireguy]

I struggled with the same question as techelec and haven't found a good answer yet. Seems it would be nice if ,in 220, it instructed you to calculate lighting at 125% since you are supposed to but the writers of the code decided that somehow you would find that one little snippet of code somewhere that shows it should be calculated as continous.

 

[Dennis Alwon]

Not all lighting loads need to be figured at 125%. Only the loads that will be on for more than 3 hours at a time. Commercial lighting will generally fall into this category.

 

[techelec]

Thanks Dennis and Wawireguy, I appreciate your help.