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Asking how many lights can go on a branch circuit for lights is like asking "How long is a piece of string?". It is impossible to give a general answer because the total number of lights that can be installed will depend on the wattage and amperage drawn by each light and on whether or not they will all be switched on together at the same times of day or night.
If you cannot work out the total amperage of the lights you want to use at any time, compared to the safe load current of the circuit breaker on your lighting circuit, the best advice anyone should give you is to call a licensed electrician for advice.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoTo figure out wattage, you multiply the Volts x Amps.
If you are using 120 Volt current, multiply times 20 Amps = 2400 W
This is the point at which the breaker should trip, so you don't want to put 2400 W on the circuit. However, if we take 2400 W / 96 W per bulb, we get 25 bulbs. 25 bulbs would trip the breaker, so you would want less than that. Keep in mind that some devices use more energy when first turned on than while running, so depending on your bulb and fixture, you may need even fewer on your circuit if you plan to have them all on at the same time.
Wiki User
∙ 11y agoYou want to size for 80% or rated current. In this case 16 amps. At 110 volts nominal this is a total of 1760 watts for incandescent bulbs. So if you had 100 watt bulbs you could have 17 100 watt fixtures. Of other wattage fixtures just divide into 1760 watts.
Wiki User
∙ 12y agoYou want the total amps to be 80% of 20 Amps or 16 Amps. A 60 Watt incandescent bulb draws 1/2 amp. Fixtures are rated as to how many watts they can support, so in case of all 60 watt bulbs you could have 32. This usually not practical.
Wiki User
∙ 11y agoIt depends upon how many will be on at the same time and how many are turned on at the same moment. If they are all left on all the time, you would derate the branch to 80 percent and divide the available power by the unit power (i.e., 1,760 watts divided by 32 is 55).
However, you must also calculate the possible overload during startup of 55 simultaneous ballast circuits, which could draw well over 60 amps for a few seconds.
Wiki User
∙ 17y agoThat depensds on the total amp draw of the fixtures. The most amp draw you can safely have on a twenty amp breaker is sixteen amps, per the NEC.
Wiki User
∙ 13y agoA 20 amp circuit can be loaded to 16 amps. Total the fixture amperage until you get to 16 and that will be the amount of fixtures you can put on the circuit.
Wiki User
∙ 13y ago20 amps * 120Volts = 2400 watts
2400Watts *80% = 1920 watts allowed on circuit.
1920watts / 65 watt light bulb = 29 bulbs
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How many T8 fixtures can go on one 20 amp circuit?
Divide 20A by the Amps listed on the label of each fixture ballast. A T8 bulb will use an electronic ballast. They generally run 1A for four 4 foot bulbs. Try 15 four bulb fixtures per circuit and use a 20A rated switch.
How many elec outlets can a GFCI detect?
7 on a 15 amp circuit and 9 on a 20 amp circuit.
How many amps equal 1 circuit?
80% of the rated circuit. 10 amp circuit is 8 amps, 20 amp circuit is 16 amps, etc.
How many outlets and lights on a 60 amp breaker?
120 amps The above answer is wrong. A 60 amp breaker is designed to trip at 60 amps be it a single pole, double pole or a triple pole that is used on three phase equipment. The number on the handle of a breaker is the trip capacity.
How many outlets can run off 1 gfi outlet?
Eight on a 15 amp circuit, tweleve on a 20 amp circuit, including the gfci receptacle itself.
New shop 20 amp circuit 32 amp fixture how many fixtures can be put on circuit?
A 32 amp fixture can not be fed from a 20 amp breaker as the breaker will trip every time.
How many 250 watt 240vachigh pressure sodium fixtures can you install on a house service with a twenty amp breaker?
My calculation shows 15 such fixtures on that circuit.
What size amp circuit breaker should be used for a pool light?
The pool light is usually on a 15 amp circuit. The breaker feeding this circuit must have a GFCI rating.
How do you know how many light fixtures a 15-amp 120-volt circuit can hold?
Depends on the fixture rating which is sized by the bulb wattage. For example, if you were using 60 Watt incandescent bulbs, they draw about 1/2 amp each. For a worst case continuous load that would be 80% of 15 amps = 12 Amps so it would be 24 fixtures rated for 60 watts each.
Can you install 12G wire to receptacles and 14G wire from receptacles up to fixtures in 20A circuit?
No. In a 20 amp circuit all wire has to be 12 AWG or larger.
How many floresent lights can go on one 15amp circuit?
The way you calculate this is by looking at the amperage marked on the ballast of the fixture. Different size fixtures have different size ballasts. A 15 amp circuit is allowed to be loaded to 80%. 80% of 15 is 12amps. Now all you have to do is divide the ballast current into 12 amps and you have the total number of fixtures that you can added to the circuit.
Is it in compliance with the National Electrical Code to install light fixtures with number fourteen leads to a thirty amp circuit?
Yes, Section 240.5(B)(2) Fixture Wires, allows #14 AWG fixture wires to be tapped to the #10 AWG branch circuit wires.
How many T8 fixtures can go on one 20 amp circuit?
Divide 20A by the Amps listed on the label of each fixture ballast. A T8 bulb will use an electronic ballast. They generally run 1A for four 4 foot bulbs. Try 15 four bulb fixtures per circuit and use a 20A rated switch.
How many elec outlets can a GFCI detect?
7 on a 15 amp circuit and 9 on a 20 amp circuit.
How many amps equal 1 circuit?
80% of the rated circuit. 10 amp circuit is 8 amps, 20 amp circuit is 16 amps, etc.
How many 5 amp TVs can be plugged into a open circuit?
You can plug in as many as you want but none of them will work. An "open" circuit is an electrical circuit which is not a complete circuit and therefore electricity will not flow through it. If you mean an unused circuit,which has no load on it, then the answer is 2 ea. 5 amp devices on a 15 amp circuit and 3 ea. 5 amp devices on a 20 amp circuit. The reason for this is that any circuit is not to be "loaded" more than 80% of the OCPD (circuit breaker amperage rating.
How many outlets are there?
Up to 12 on a 20 amp circuit. Up to 9 on a 15 amp circuit. But use common sense. If the circuit will be heavily loaded, as in a home office, then do not install that many.
