Lighting Load calculation

[gmayeux]

in calculating a commercial service to determine lighting loads I am applying 220.12 and table 220.12, the floor area multiplied by the appropriate Volt-amp/ft2, the question once you determine lighting total VA , do you then multiply that by 1.25 for a continuous load?

 

[Dennis Alwon]

I have never seen a calculation that added 25% to the load. I assume the wattage/sq.ft takes that into consideration.

Look at annex D- example D3 in the back of the nec

 

[MyCleveland]

I have never seen a calculation that added 25% to the load. I assume the wattage/sq.ft takes that into consideration.

Look at annex D- example D3 in the back of the nec

Dennis
Please read to the end of example where they size the service....continuous x 1.25

 

[Adamjamma]

If the lights would be considered continuous, and are over 75 Watts, then you would need to use the 125 rule as I understand it, as the square foot rule was based on 100 watt lightbulbs...
and non continuous usage...
but, most lights are now LED or Halogen, so use less than 20 Watts. Thus, the wattage times 1.25 will not be above 100 Watts per outlet.

Unless i I have misunderstood the rules for design here.

i know you can get into continuous load rules on lights that stay on all the time such as in stores.