# Watts or Amps for Wiring a Lighting Circuit

• 04-02-2012, 10:02 AM
hagler
Watts or Amps for Wiring a Lighting Circuit
15 Amp circuit for lighting in a horse barn

Fixtures will be as follows (from Orion West Lighting - Equine):
Round Light Fixtures = 36 Watts 0.3 Amps (CFL)..........output = 200 watts
4' Fluorescent Fixtures = 84 Watts 0.7 Amps (CFL).......output = 500 watts

Using the Round Light Fixtures as an Example:
Can I figure out how many fixtures to be placed on the circuit by keeping the ACTUAL Amp TOTAL below 12 Amps (if using 80% rule..there is a possibility of all of the lights being on continuosly in the barn) ??? ..... could put many lights on the circuit drawing only 0.3 Amps per fixture....

Or, do I have to go by the output of 200 watts, even though CFLs are being used?
----this would limit me to about 7 Round Lights per 15 Amp circuit (1400 watts of 1440....80% rule)

Thank you!
• 04-02-2012, 10:46 AM
Speedy Petey
The "output" watts is a rough equivalent of light output, NOT draw,. so that number is meaningless as far as circuitry goes.

Also, a continuous load circuit is not one where the load may possibly be on for three hours or more. It is one where the load is expected to be on for three hours or more. If it were the form,er then every circuit would be continuous.
That said, a lighting circuit in a horse barn may very well be considered a continuous load, so wiring it that way would never be a bad thing. Considering the low wattages involved here I don't think it is a big deal either.
• 04-02-2012, 10:47 AM