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Old 01-01-2012, 11:43 AM   #1
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12 amp draw from an 800W space heater?


I have a small 800W max space heater in the garage. Most of the time it works fine, but occasionally it will trip the 15 amp breaker it's on. I put an ammeter on it and got a draw of over 12 amps at "high," 7.5 amps at "medium" and 5 amps at the "low" setting.

800W should only be a 6.6 amp draw, max, So what gives? How is a 6.6 amp device drawing 12 amps?

The ammeter is accurate. I tested it against both legs of my drier circuit and got 22.5 amps on one leg and 27.5 on the other, both correct draws for a 30 amp max drier. (one leg powers the drum motor at 120V, so that's why the higher amperage on one leg).

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Old 01-01-2012, 11:56 AM   #2
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12 amp draw from an 800W space heater?


Quote:
Originally Posted by Bigplanz View Post
800W should only be a 6.6 amp draw...
How is a 6.6 amp device drawing 12 amps?
Something else is on the circuit (or there is a fault).

hth

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Old 01-01-2012, 12:10 PM   #3
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12 amp draw from an 800W space heater?


Quote:
Originally Posted by Bigplanz
I have a small 800W max space heater in the garage. Most of the time it works fine, but occasionally it will trip the 15 amp breaker it's on. I put an ammeter on it and got a draw of over 12 amps at "high," 7.5 amps at "medium" and 5 amps at the "low" setting.

800W should only be a 6.6 amp draw, max, So what gives? How is a 6.6 amp device drawing 12 amps?

The ammeter is accurate. I tested it against both legs of my drier circuit and got 22.5 amps on one leg and 27.5 on the other, both correct draws for a 30 amp max drier. (one leg powers the drum motor at 120V, so that's why the higher amperage on one leg).
I would first check your voltage to ensure you have your 120v, It's weird you are double in your amperage from nameplate are you sure this unit was intended for 120 and not 220 ? It's a pure resistive load so you need to find out what can be increasing the resistance. If in the wiring or controls look or feel for anything creating heat signature an obvious sign of high resistance.
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Old 01-01-2012, 12:14 PM   #4
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12 amp draw from an 800W space heater?


I need to know what gauge wire I need to hook up an electric stove. It says on the stove tag, it is 10 kw,120/240. It does not say the amps.i was told it needs a 50 amp circuit breaker. Is it 8 ga. 3 wire, or 6 ga. 3 wire? Thanks, FrankLa.
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Old 01-01-2012, 12:17 PM   #5
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12 amp draw from an 800W space heater?


Quote:
Originally Posted by FrankLa
I need to know what gauge wire I need to hook up an electric stove. It says on the stove tag, it is 10 kw,120/240. It does not say the amps.i was told it needs a 50 amp circuit breaker. Is it 8 ga. 3 wire, or 6 ga. 3 wire? Thanks, FrankLa.
Is this in regard to the original post? If not please start a new post
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Old 01-01-2012, 01:03 PM   #6
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12 amp draw from an 800W space heater?


It's a $14 harbor freight heater. It's 120V and the voltage reads 124V on my meter.
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Old 01-01-2012, 01:21 PM   #7
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12 amp draw from an 800W space heater?


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It's a $14 harbor freight heater.
Go to Wal-Mart and get a $14 Holmes.
The 1500Watt model I have (2) comes with a fan.
It's nice.
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Old 01-01-2012, 01:33 PM   #8
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12 amp draw from an 800W space heater?


FWIW, I gave $8 for it as everything at HF is on sale and there is always a 20% off coupon in the Sunday paper. Holmes heaters are nice. I have a couple in the basement. Might run the ammeter on them today sometime.
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Old 01-01-2012, 01:55 PM   #9
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12 amp draw from an 800W space heater?


dirty coils/fins or loose connection within the heater
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Old 01-01-2012, 04:12 PM   #10
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12 amp draw from an 800W space heater?


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Originally Posted by Bigplanz View Post
I put an ammeter on it and got a draw of over 12 amps at "high," 7.5 amps at "medium" and 5 amps at the "low" setting.).
Are you sure it is an 800 watt heater as opposed to 1500 watts? Is 800 printed on a label or engraved on the bottom of the heater itself? I haven't seen heaters with that low a maximum rating (800 watts).
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Old 01-01-2012, 04:17 PM   #11
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12 amp draw from an 800W space heater?


Are you using it with an extension cord? Would that do it?
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Old 01-01-2012, 05:45 PM   #12
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12 amp draw from an 800W space heater?


Does it say "Made in China"?

They make extension cords with phony UL labels which have too small of wire. And counterfeit circuit breakers. Cough syrup which has killed people in South America...

So I would not be surprised if they also make a space heater which draws too much amperage and has a phony UL label!

Might want to report this...
["Contact the U.S. Customs hotline at 1-800-ITS-FAKE (1-800-487-3253) or UL to issue a report."]
http://www.ul.com/global/eng/pages/o...perations/faq/
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Old 01-01-2012, 05:51 PM   #13
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12 amp draw from an 800W space heater?


There could well be a problem with the heating element,
Sometimes with age the coil in the heating element
can move and sag, they can then come into contact
with other parts of the element, effectivily
shorting out parts of the element.
this can lower the resistance of the element
and thus it draws more currant.

Time to get rid of it !
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Old 01-01-2012, 06:22 PM   #14
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12 amp draw from an 800W space heater?


Quote:
Originally Posted by Bud Cline View Post
Are you using it with an extension cord? Would that do it?
No, an extension cord, even if substandard, will not cause the heater to draw more current.
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Old 01-01-2012, 06:35 PM   #15
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12 amp draw from an 800W space heater?


Quote:
Originally Posted by Bud Cline View Post
Are you using it with an extension cord? Would that do it?
No., not really if that the case the voltage level will drop due most of the extendison cord in State side are small typically 16 gauge size ( sometime 18 gauge can show up )

So with the extendison cord the votlage drop will show up more so like example a 120 volt heater plug in sans extendson cord will run normally as it supposed to be like 1200 watts by time you put the extendsison cord on the actual wattage will drop depending on how much voltage it will drop so like example instead of 120 volts it will drop like 110 volts the heater wattage will drop down more like 1000 watts.

But with any heating element they are sensitve with voltage change so if you drop down couple volts it will change a bit ditto with increase voltage it will change a bit as well.

Merci,
Marc

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