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Old 11-30-2012, 12:18 AM   #31
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15 or 20amp for basement finishing


The other thing I did not see in the plan is the luminaires.

How many are you plan to use and what type they are ??

I will give you a quick head up if you going to use the recessed cans luminaires size the circuit by the maxuim wattage it listed in the recessed cans the reason why I say that due some case you may put in 75 watt light bulb for a example but in fact you may use the CFL ( compact flourscent lamp ) which it will be 18 or 23 watts or use lower wattage indentscent bulbs.

And are you going to use them with dimmer as well ? if so please pay attetion to the wattage rating on the dimmer.

Most common dimmer wattage useally 600 watts rated but there are higher dimmer wattage rated like 1000 watts or 1500 watts.

But just be aware if you going to run multigang box with dimmer the derating may kick in depending on how many fins it have to be removed or numbers of gang in the box ( the dimmer installment instruction will mention that clear.)

Expect the dimmer to be warm when they are using ( my favour soluation is use the metal switch plate cover they act like big heat sink to keep it cooler )

Merci,
Marc

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Old 11-30-2012, 07:05 AM   #32
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15 or 20amp for basement finishing


I'm using (6) 5in IC rated recessed lights on a 600w dimmer switch. I plan on using dimmable CFL bulbs (75w equiv), so my wattage shouldn't even be close, correct?
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Old 11-30-2012, 08:03 AM   #33
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15 or 20amp for basement finishing


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Originally Posted by Trucon01 View Post
I'm using (6) 5in IC rated recessed lights on a 600w dimmer switch. I plan on using dimmable CFL bulbs (75w equiv), so my wattage shouldn't even be close, correct?
I think you have to size the circuit based on what you could use, not what you plan to use. If the recessed light fixtures are rated for 150W each, 6x150 = 900W, then you're over the rating of your 600W dimmer, even though you intend to only have ~150W of actual load using the CFLs..
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Old 11-30-2012, 09:40 AM   #34
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15 or 20amp for basement finishing


The housings are rated for 75w each. The CFL bulbs are 14 watts each but a 75 watt equiv. With CFL, you use the actual wattage of the bulb, not the equiv, correct?

14w x 6 = 84 watts
75w x 6 = 450 watts

Either way, I'm still under the 600w max on the dimmer.

This brings up a good question though...

I'll have a 15a circuit just for the main 6 lights in the room on a 600w dimmer. The dimmer will be in a 2 gang box with another 600w dimmer that will control 2 smaller recessed lights for a book shelf, all on the same 15a circuit. Is this ok?

Since the dimmers will be in the same box, sharing the same 15a circuit, will the wattage between them also be shared?
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Old 11-30-2012, 09:44 AM   #35
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15 or 20amp for basement finishing


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Originally Posted by redman88 View Post
run the 12/2 and just use 15amp breaker untill you need the 15amp
The wire size determines the breaker size.

14-2 you must use a 15 amp breaker

12-2 you have to use a 20 amp breaker

Think about it from a practical standpoint. Lights on, tv on, now out comes the vacuum cleaner and the breaker trips.

Makes no sense to run 20 amp wire and install a 15 amp circuit breaker, not to mention it is also against the NEC code.

Nope, I was wrong, just double checked, it is ok to put a 15 amp breaker on 12 wire. oops!

Last edited by TTW; 11-30-2012 at 12:01 PM. Reason: I was wrong
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Old 11-30-2012, 09:51 AM   #36
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15 or 20amp for basement finishing


Correct. I plan on doing 12-2 wire, 20a breaker with 20amp recepts. If I'm using the wire, Im not cheaping out on the recepts

He may have meant to use 15a recepts, not breaker...
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Old 11-30-2012, 10:49 AM   #37
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15 or 20amp for basement finishing


Quote:
Originally Posted by Trucon01 View Post
The housings are rated for 75w each. The CFL bulbs are 14 watts each but a 75 watt equiv. With CFL, you use the actual wattage of the bulb, not the equiv, correct?

14w x 6 = 84 watts
75w x 6 = 450 watts

Either way, I'm still under the 600w max on the dimmer.

This brings up a good question though...

I'll have a 15a circuit just for the main 6 lights in the room on a 600w dimmer. The dimmer will be in a 2 gang box with another 600w dimmer that will control 2 smaller recessed lights for a book shelf, all on the same 15a circuit. Is this ok?

Since the dimmers will be in the same box, sharing the same 15a circuit, will the wattage between them also be shared?
The lighing load is computed at the max the fixture uses.
1 15 amp circuit is fine.
When dimmers are mounted in the same box, they have to be derated.
Most 600 watt dimmers will be derated to 500 watts or less when mounted in the same box.

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