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Old 08-01-2006, 07:08 PM   #16
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heating element 240 volt single phase


On remodels they are required, and if I were running the job I would shut down the entire are from the MDP and lock the electrical room door behind me. After building power is on I treat everything like it's hot, unfortunately this happened to a friend of mine, who I'm sorry to say, has blown up 3 things so far on this one job, pretty pathetic. Perhaps one day he'll realize this $hit is dangerous.

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Old 02-19-2011, 05:20 PM   #17
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heating element 240 volt single phase


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Sure they do. They just wind round and round in the motor a bunch of times first. When the motor starts the magnetic field creates enough resistance to keep a short circuit from happening.

A common light bulb is also nearly a dead short. The bulb works like the heating element. It has a high resistance. When the electricity is applied it heats up. In the case of the bulb it also becomes bright and it is put in a glass vacume so that you can see the light.

A heating element heats up without alot of light. This is because it is made from a different type of metal. The key is that the resistance is high when they are on.

This is confusing becuase with the average meter the resistance seems like it is near zero when they are off. The resistance of these metals does change with temperature.

In the case of a motor with a copper coil. it is the magnetic field that creates an impeadance. impeadance works like resistance in an electrical circuit.
The 240 volts are in fact just 2 legs of 120 however they never in any electric motor make contact at anytime ever! How an 240 volt motor works is the 2 120 volt legs are 120 degrees away from each other which in a motor creates magnetic fields at different times. the windings alternate one 120 volt leg than the other and so on. Because the 2 120 volt legs are 120 degrees away from each other they create the magnetic force at different times which turns the motor. Now to answer the question about 240 volt heating elements. As i mentioned before the 2 120 volt legs are 120 degrees out of phase with each other. What this means is as one is positive the other is negative. In the heating element there is great resistance to the electrical current which reduces the voltage greatly and while one leg is positive the other is negative and because of the extreme voltage drop the leg which is positive will disapate into the leg which is negative. Hopefully this will answere your question. These answeres are correct. I have been an industrial electritian for 10 years (journeyman).
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Old 02-19-2011, 05:45 PM   #18
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heating element 240 volt single phase


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Most electrical deaths are from 120V, possibly because it is most common for unskilled people to be working on. People seem to have no idea what they're dealing with, pretty silly to me.

Just pissed at the moment I guess. yesterday some a-hole door guy went flippin breakers when his radio stopped working and burned my buddy pretty who was installing an exit sign. Are lockouts really necessary on job sites? I woul've thought people would have enough common sense. Next time we'll shut down the whole building if that's what it takes.
acording to oasha 480 is the voltage where most fatal electricutions occur 120 volt is second. As far as lockouts go, you asked are they necessary to this I ask is it necessary you dont die on the job??? Lockout is mandatory ! Dont be in a hurry and become a statistic just do it. I do have a sugestion on this because I have had people turn breakers on while I was performing service. Instal a jumper from the hot wire to ground at the point you are working. This will prevent you from getting shocked if someone were to turn the breaker back on.(just dont forget to remove it)
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Old 02-19-2011, 09:32 PM   #19
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heating element 240 volt single phase


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The 240 volts are in fact just 2 legs of 120 however they never in any electric motor make contact at anytime ever! How an 240 volt motor works is the 2 120 volt legs are 120 degrees away from each other which in a motor creates magnetic fields at different times. the windings alternate one 120 volt leg than the other and so on. Because the 2 120 volt legs are 120 degrees away from each other they create the magnetic force at different times which turns the motor. Now to answer the question about 240 volt heating elements. As i mentioned before the 2 120 volt legs are 120 degrees out of phase with each other. What this means is as one is positive the other is negative. In the heating element there is great resistance to the electrical current which reduces the voltage greatly and while one leg is positive the other is negative and because of the extreme voltage drop the leg which is positive will disapate into the leg which is negative. Hopefully this will answere your question. These answeres are correct. I have been an industrial electritian for 10 years (journeyman).
Me thinks you don't quite understand every thing you think you know, especially about motors.
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Old 02-20-2011, 06:57 AM   #20
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heating element 240 volt single phase


jadbad2004, you do realize the fact that you are replying to 5 YEAR old posts, don't you?

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