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Old 07-18-2010, 07:56 PM   #1
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Number of can lights on one circut


Looking for the max number of can lights on one 20 amp circut. Will probably be using 60 watt bulbs.
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Old 07-18-2010, 07:58 PM   #2
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What's the maximum wattage rating of the high hat?

Why are you using a 20A circuit for lighting? #12 wire in those little junction boxes is a pain.
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Old 07-18-2010, 08:15 PM   #3
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20a = 2400w /60w bulb = 40 bulbs
I never max out a lighting circuit, always leave some spare wattage

Canada has limits on the number of devices

Where are you located ?



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Old 07-18-2010, 08:17 PM   #4
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If the fixtures are rated for 75 watt max, I would stay under 25 fixtures. If 60 watt rated fixtures, I would stay under 32 fixtures. Of course that is with no other loads on the circuit.

calculate the load with the max rating of the fixture. Never know if you might end up putting the max lamp size in the fixture.

the above numbers are figured with an 80% load on the circuit.
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Old 07-18-2010, 08:19 PM   #5
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I agree with nap, you are best to keep it at 80% and to go by the max wattage of the fixture, not the bulb you plan on using.
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Old 07-18-2010, 08:21 PM   #6
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Quote:
Originally Posted by Scuba_Dave View Post
20a = 2400w /60w bulb = 40 bulbs
I never max out a lighting circuit, always leave some spare wattage

Canada has limits on the number of devices

Where are you located ?
I'm in Anchorage, AK
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Old 07-18-2010, 08:41 PM   #7
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Quote:
Originally Posted by Proby View Post
I agree with nap, you are best to keep it at 80% and to go by the max wattage of the fixture, not the bulb you plan on using.
Sizing the circuit is required to be on the maximum bulb rating of the fixture.
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Old 07-18-2010, 10:18 PM   #8
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It is my SOP is sized the circuit by maxuim wattage lumiaire rating so some luminaire I have ran into take much higher wattage so I have to go by the rating of them.

Merci.
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Old 07-18-2010, 10:26 PM   #9
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Quote:
Originally Posted by Jim Port View Post
Sizing the circuit is required to be on the maximum bulb rating of the fixture.
Do you know the code reference for that by chance ?
I've looked for it but unable to find it
The cans I buy have a max wattage of 150w (I think) depending upon bulb/trim
So I have always gone by my load



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Old 07-18-2010, 10:30 PM   #10
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Quote:
Originally Posted by Scuba_Dave View Post
Do you know the code reference for that by chance ?
I've looked for it but unable to find it
The cans I buy have a max wattage of 150w (I think) depending upon bulb/trim
So I have always gone by my load


Dave.,

I know it did mention in the NEC and for sure it do stated clear in French Electrical codes as well they will stated

"The luminaire circuit will be sized by maxuim wattage of the luminaires "

I am sure Jim can quote the excat number for NEC code on 2008 Editon for you.

Merci.
Marc
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Old 07-18-2010, 10:46 PM   #11
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Quote:
Originally Posted by Scuba_Dave View Post
Do you know the code reference for that by chance ?
I've looked for it but unable to find it
The cans I buy have a max wattage of 150w (I think) depending upon bulb/trim
So I have always gone by my load
can't say I've seen to many fixtures rated for 150 watt lamps either.

I can't cite code either but as I stated before, you need to use fixture rating. If not, you might end up putting in bigger lamps and if you calculated it on (you said yours are 13 watt, right?) and then put 150's in there, you can use less than 1/12 of the quantity on the same circuit. Could become a problem real easily.
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Old 07-18-2010, 10:57 PM   #12
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Quote:
Originally Posted by Jim Port View Post
Sizing the circuit is required to be on the maximum bulb rating of the fixture.
Are you agreeing or disagreeing with what I said? I'm not sure brother

Quote:
Originally Posted by Scuba_Dave View Post
Do you know the code reference for that by chance ?
220.14 (D) Luminaires. An outlet supplying luminaire(s) shall be calculated based on the maximum volt-ampere rating of the equipment and lamps for which the luminaire(s) is rated.

Last edited by Proby; 07-18-2010 at 11:12 PM.
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Old 07-19-2010, 04:27 AM   #13
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I was agreeing with both yourself and NAP. Thanks for posting the correct Article.
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Old 07-19-2010, 08:33 AM   #14
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Thanks....I must have skipped past that section at least a dozen times
I actually do have my can ratings in a sprads sheet
I have 3 lighting circuits...one only has 1000w on it by the load calc
--this is the original lighting circuit in the house
--actual load w/CFLs/mix is 700w
But it has 2 old outlets in the dining room on the circuit



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