Exterior Lighting Calculation

[onemarketplace]

Ok, I need to calculate the load for 11 light fixtures which are installed in an exterior canopy but I can't find the Volt-Amp value on table 220.12 for this application. Can someone tell me if there is a standard value like 1200VA or other number for this applications. Thanks

These fixtures will be continuos loads and will be devided into (3) 20 Amps existing circuits, 120, 240 1phase.

 

[JohnJ0906]

Ok, I need to calculate the load for 11 light fixtures which are installed in an exterior canopy but I can't find the Volt-Amp value on table 220.12 for this application. Can someone tell me if there is a standard value like 1200VA or other number for this applications. Thanks

These fixtures will be continuos loads and will be devided into (3) 20 Amps existing circuits, 120, 240 1phase.

Use the rating of the lights. 220.14(D)

 

[Mr. Bill]

What are these 11 lights? If it's incandescent then the Wattage of these lamps is equal to the VA. (11) 100W lamps would equal 1,100VA.

If these are fluorescent or HID then you need to look at the combination of the lamp and ballast. An HID ballast with a 100W MH lamp may draw 0.55A @ 240V. (11) * 0.55A * 240V would equal 1,452VA. Different ballasts will have slightly different amp draws.

Why are they on 3 separate circuits? It's only 6A at 240V. Or 12.1A at 120V. Voltage drop shouldn't be a concern for a canopy.

Why do you care about the canopy VA? I wouldn't worry too much about table 220.12. Most energy Codes are 2 to 3 times more strict. Yes, burn me at the stake, I'm ignoring a portion of the Code. Do I really need to provide (2) 120V circuits for lighting in a 900sf classroom if the State's energy code limits the room to 1350W? Does HVAC also need to use this table for heat load calculations? I'll start a new thread so as not to divert from this original post.