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High voltage

High voltage

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Thread: High voltage

  1. #1
    Join Date
    May 2013
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    Default High voltage

    Why would a dryer receptacle read 270 volts? "Tech" told my sister this causing a low heat siuation. This was his second trip to her house. First trip he did some cleaning on it, put his hand down by the exhaust, felt heat and said it was blowing heat.

    He says someone needs to check the dryer circuit.

    She loves on a different coty or I would take a stab at it..

    Comments?

  2. #2
    Join Date
    Feb 2012
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    Lala land, OH
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    First thing to do is to check this meter's battery. Some low end voltemeters will give false high AC voltage readings with weak batteries. If in doubt, try another meter or measure a known good AC voltage that is not in this house and on the same voltage range. If you don't have a meter you can get a decent one for free at harbor freight. They cycle a free meter as their monthly ad promo. Sticking your hand in the exhaust to check for heat makes me question anything he says.

    270V to what?

    240VAC from hot leg to hot leg +/- is a typical voltage. It wont be exact. The voltage coming into your house is never exact and will change slightly over time.
    You should also have -around- 120VAC from each hot leg to neutral and ground, and both these numbers should be close to being the same and should add up to your above reading. I just checked and my house is 122VAC on each leg.

    Your hot to neutral voltages being off by 1 or 2 volts is no big deal. If its more then a 5v difference, then you have a electrical (neutral leg) issue and should call out an electrician.

    If you have 270V at your dryer and around 135 from hots to ground and at your outlets, then you need to call your power company... and unplug all your electronics.
    If they have a neighbor(s) that share the same pole transformer, their voltages should be the same as yours. If theirs are that high too then tell that to the power company and they will likely be there in a few minutes. Your house's voltage is set by a tap on the pole transformer and the voltage coming into the transformer. The voltage coming out is a ratio of the voltage coming in. This process repeats several times on your powers trip from the generating source to your house.

    Heat coming out of the element is a result of power. Power is current x voltage. Higher voltage = higher heat... Too much and it will trip the dryers thermostat. Some will reset when it cools down and will cause the heating to cycle.
    Last edited by Mr T; 01-30-2016 at 10:19 AM.

  3. #3
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    Why would a dryer receptacle read 270 volts?
    Might want to ask this in the electrical forum also.
    https://www.ez-forums.com/forumdispl...al-Residential
    Power coming in from the street, from the transformer, can be too low or high.

    Why would a dryer receptacle read 270 volts? "Tech" told my sister this causing a low heat situation.
    None of that makes sense!

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  4. #4
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    Thankx Mr T.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  5. #5
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    Default

    Too much and it will trip the dryers thermostat. Some She did say they blew a shop vac through the pipe and the outside vent cover openedwill reset when it cools down and will cause the heating to cycle.
    Could this be what he was getting at?

    Might add she said the vent pipe goes up and out. I do not know how far up or anything about that. She said they "cleaned" the vent out with some kind of cable, and there was still moisture in the pipe when they took it off the dryer. I suspect there may be a problem there. They blew a shop vac through the vent and the outside vent cover opened, but I am not so sure that is an indication the vent is clear.

    Thanks to you guys for replying.

  6. #6
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    Could this be what he was getting at?
    Too much heat will trip it.
    Something else is going on here!
    Tell her to disconnect the vent pipe from the dryer and try a load to see what happens.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  7. #7
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    I would address this voltage issue before trying anything. Hopefully it is just a bad meter or they didn't know what they were doing.

    if it was true 270 on a dryer outlet would equal 135V in the rest of their house if their power is balanced. This is probably not enough to blow light bulbs or cause immediate damage to electronics, but it will shorten the life of about anything electric. The issue is greater on 240V devices (electric water heater, range, central air, dryers, etc.

    You may not even have a problem with your dryer at all.

  8. #8
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    Saw her a few days ago, but forgot to ask her if this problem had been solved. Maybe in a few days I will find out. I am curious about this.

  9. #9
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    Saw her a few days ago, but forgot to ask her if this problem had been solved
    You forgot to see if your sister needed help....shame on you....bad brother

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  10. #10
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    I blame on old age now. :{
    I did make the block to go back to ask herbut did not see her. So I tried. :}

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