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Common sense with electrical systems dictates that current in a circuit be limited to 80% of nameplate (20A). The number of 150W lamps will be limited to 12 in this scenario. This answer can be superseded by local ordinance.

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15y ago

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To answer this question a voltage needs to be stated. W = Amps x Volts to find total circuit wattage. Then divide the bulb wattage into total circuit watts.

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12y ago
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Q: How many 75 watt bulbs can be on a 20 amp circuit?
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