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Using twelve gauge wiring how many eight foot fluorescent lights using 110 watt bulbs can you use on one twenty amp circuit breaker?
Wiki User
∙ 15y ago
Ohm's law states: I*E=P in other words: I = amps, P=watts, E=volts If: I or Amps=20 and E or Volts=120 (i am guessing as this one is standard for a residance) Then: 20 * 120 = 2400 or 2400 watts of power are avaliable 2400 watts / 110 watt bulbs = 21.8 bulbs can in theory, be placed on a 20 amp 120 volt circuit. The reality is that you would probably not want to place more than 17 or 18 100w bulbs on a circuit for safety and code required design load calculations. However you can bet that all bulbs in a residance will not be active at one time and therefore seldom will the peak load be at max. None of this takes into account any other loads on the circuit or derating factors such as heat, etc. When in doubt always get a qualified electrician to help or guide you as electrical fires are the cause of much property loss and life safety concern. SAFETY FIRST AND ALWAYS! Hope this helps! Terry
Wiki User
∙ 16y ago
Wiki User
∙ 11y agoAssuming you're working with 120 volts, and you use 80 percent of the breaker's rated wattage for "full-time" loads, you could burn 1,920 watts, or 137 watts for each of 14 bulbs.
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Open the fixture and look at the ballast. There it will have the amperage of what the primary input side of the ballast is. For 8 foot fixture having two tubes it should be about 1.75 amps. Multiply the number you find by 7 for seven fixtures and you will find the total amperage of the circuit. e.g. 1.75 x 7 = 12 amps. A #12 wire is rated for 20 amps less 80% for full loading equals 16 amps total load allowed. Use the actual amperage found in your fixture and not my example number.
Wiki User
∙ 15y agoYou have many things going here. #12 wire connected to a 20A breaker, this is correct. Load limit of #12 wire to 80% = 16 amps continuous The lamps of 8 foot fluorescent fixtures are not 100 watts. What you have to do is look at the amperage marked on the ballast of the fixture. About .75 amps, but check to make sure. Divide the ballast amps into 16 usable amps. This will give you the amount of fixture you can connect to your circuit. There might be a code rule as to the maximum amount of fixtures allowed on one branch circuit, check with the local electrical inspector.
Wiki User
∙ 11y agothe average twin bulb 8 foot fixture draw .75 amps. divide 15by .75 your answer is 20.
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Can you plug a 120 volt 20 amp into a 120 volt 15 amp outlet?
No, it would not be safe unless you replace the 20 amp circuit breaker with a 15 amp one. All the components of a circuit must meet the minimum capacity. If you replace a "big" receptacle with a weaker one, it may cause problems.
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