Here are some special numbers that anyone seriously into electrical work should make note of? Can you tell me why they need to be remembered?

1.732 (This was rounded off)

120.0 & 360.0 degrees (not temperature) Think of a circle.

80%

Now for a question where one or more of the above numbers comes into the formula. Assume that you have a three phase heater that draws 10,000 Watts total at 208 Volts. How many Amperes of current will flow through each hot conductor? There are 3 matched elements connected in a delta configuration. Also, what is the Wattage rating of each element?

If there were single phase power and just one element, I'm sure most of you would figure the answer quickly. I want to know the current based on the above, please.

Now let's figure this out as well. What would be the minimum circuit breaker rating that's safe to use for this heater? Please assume that all wiring will be done with a good safety factor figured in and I'm not asking about wire gauge or insulation type here. The idea is to prevent tripping of the circuit breaker when the heater is running for hours at a time.

There are 3 hot conductors and the case of the heater is grounded.

Feel free to round off your answers some. Either you'll be pretty close or you'll have goofed.

1.732 (This was rounded off)

120.0 & 360.0 degrees (not temperature) Think of a circle.

80%

Now for a question where one or more of the above numbers comes into the formula. Assume that you have a three phase heater that draws 10,000 Watts total at 208 Volts. How many Amperes of current will flow through each hot conductor? There are 3 matched elements connected in a delta configuration. Also, what is the Wattage rating of each element?

If there were single phase power and just one element, I'm sure most of you would figure the answer quickly. I want to know the current based on the above, please.

Now let's figure this out as well. What would be the minimum circuit breaker rating that's safe to use for this heater? Please assume that all wiring will be done with a good safety factor figured in and I'm not asking about wire gauge or insulation type here. The idea is to prevent tripping of the circuit breaker when the heater is running for hours at a time.

There are 3 hot conductors and the case of the heater is grounded.

Feel free to round off your answers some. Either you'll be pretty close or you'll have goofed.

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