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Please help with this math problems from Delmar Electricity....?

3. Standard lamp sizes are 25 watt, 40 watt, 60 watt, 75 watt, and 100 watt.

You are employed at a large industrial plant. A 480-V, 5000-W heater is used to melt lead in a large tank. It has been decided that the heater is not sufficient to raise the temperature of the lead to the desired level. A second 5000-W heater is installed on the same circuit. What will be the circuit current after installation of

the second heater and what is the minimum size circuit breaker that can be used if this is a continuous-duty circuit?

4. You have been hired by a homeowner to install a ceiling fan and light kit in a living room. The living room ceiling light fixture being used at the present time contains two 60-W lamps. After locating the circuit in the panel box, you find that the circuit is protected by a 15-A circuit breaker. After turning on all lights connected to this circuit, you have a current draw of 8.6 A and a voltage of 120 V. The ceiling fan light kit contains four 60-W lamps, and the fan has a maximum current draw of 1.6 A. Can this fan be connected to the existing living room circuit (replacing the current ceiling light fixture)?

2 Answers

  • 2 months ago

    You need to know and understand this, and that is what they're checking by asking the questions.  Our answers won't help.

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  • 2 months ago

    You're on your own before even drilling holes for Romex in my house. You need to know it.

    • Commenter avatarLogin to reply the answers
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