Wall Outlet Melted Through

[DonL]

Another thing to think about is voltage drop from the Feed to the Outlet and the power cord before the heater elements.

And there will be plenty, especially when the wires and electrical connections heat up, from long periods of time, 100% Duty Cycle. Trying to heat the house.

1500 watts is 12A @ 125V
1500 watts is 12.5A @ 120V
1500 watts is 13.043A @ 115V
1500 watts is 13.636A @ 110V

You get the point.

1500 Watts is to much for a outlet to be safe, when operating for long periods of time, Period.

Buy a 1500 watt heater and test it for yourself, If you do not believe. Measure the Voltage at the outlet, and the temperature of the outlet and power plug and wire. Then you will run it on its low setting, and stop trying to heat the whole house or a large room with it.


Have Fun.

 

[DonL]

Happy Holidays

 

[Sponsor]

 

[Speedy Petey]

any load that is for 3 hours or more is to be calculated at 125%.

And load that is expected to continue for three hours or more. Expected is the key word here.

Resistive loads are 125%

What's the code section on this?

I am sure of what I am saying and stand by the use of all and will

I'm sure you do. I'm sure you do.

 

[Speedy Petey]

Another thing to think about is voltage drop from the Feed to the Outlet and the power cord before the heater elements.

And there will be plenty, especially when the wires and electrical connections heat up, from long periods of time, 100% Duty Cycle. Trying to heat the house.

1500 watts is 12A @ 125V
1500 watts is 12.5A @ 120V
1500 watts is 13.043A @ 115V
1500 watts is 13.636A @ 110V

You get the point.

Are you SURE about this??? Maybe run the numbers again remembering that this is a resistance heat load.
Punch your numbers into an Ohm's law calculator, keeping the resistance the same. You may want to edit your post after.

 

[DonL]

Are you SURE about this??? Maybe run the numbers again remembering that this is a resistance heat load.
Punch your numbers into an Ohm's law calculator, keeping the resistance the same. You may want to edit your post after.

Don't need any special calculator. PIE is good.

Please correct my figures if you can. No need to edit my post, because it is correct.

 

[Speedy Petey]

Don't need any special calculator. PIE is good.

Please correct my figures if you can. No need to edit my post, because it is correct.

Must I do everything?
And since when does resistive heat get higher in amperage with lowering the voltage??? And how is the wattage staying the same?

125V
1500W
12A
10.42Ω

120V
1382W
11.52A
10.42Ω

115V
1270W
11A
10.42Ω

110V
1162W
10.56A
10.42Ω

 

[Speedy Petey]

You never noticed the specs on an electric baseboard heater before??
See: http://www.homedepot.com/p/Cadet-72...6F1500W/100080894?N=5yc1vZc4ku#specifications

Voltage (volts) 240/208
Wattage (watts) 1500/1125

 

[DonL]

Must I do everything?
And since when does resistive heat get higher in amperage with lowering the voltage??? And how is the wattage staying the same? The resistance stays the same.

125V
1500W
12A
10.42Ω

120V
1382W
11.52A
10.42Ω

115V
1270W
11A
10.42Ω

110V
1162W
10.56A
10.42Ω

Nice try.

But the resistance of a heating element changes, It does not not stay the same, when a different voltage is applied.

Try again.

 

[Speedy Petey]

OK then. I'm done. You win. You're right. Always are.

 

[DonL]

OK then. I'm done. You win. You're right. Always are.

No I am not always right.

I will admit when I have my head up my ass. Don't think so for this theory.

When Voltage goes down, Current goes up. When Voltage goes up Current goes down, If the load stays the same.

When a heating element gets hot, the resistance goes up. The lower the voltage is at the element, the less resistance it has, and the more current it draws.


Simple really.

 

[Vegas_sparky]

I'm with Petey on this one. KW ratings of resistive heaters are typically different when varied input voltages are applied. Higher input voltages=higher KW rating.

 

[DonL]

I'm with Petey on this one. KW ratings of resistive heaters are typically different when varied input voltages are applied. Higher input voltages=higher KW rating.

I agree with that also. I never said it don't.

The lower the voltage, at the element, the less the output. Very True, That is correct.

I was talking about Voltage Drop in the wiring and connections.

The wire and connections get hot, Not all of the power is dissipated by heating element. That was my point.

But the same is true if you start with low voltage to begin with. The current goes up.

 

[ActionDave]

any load that is for 3 hours or more is to be calculated at 125%. Resistive loads are 125%.....

ANY load that is for three hours? Art. 100 restricts it to any load where the MAXIMUM current is expected to continue for three hours or more.

 

[ActionDave]

But the same is true if you start with low voltage to begin with. The current goes up.

Not for resistive loads.

 

[DonL]

Not for resistive loads.

You and Petey are correct.

I still stand by my 1500 Watts is to much for a space heater. They make the plug Hot in 30 Minuets. I have tested many of them. And the load is not pure resistive. It is a Coil of wire, so it has a bit of Inductance. The Hotter it gets the more resistance it has also, Just like a lightbulb.

I present my Picture

Happy Holidays, Drink Don't Drive.

 

[Speedy Petey]

Just for clarification. I didn't mean to imply that the resistance stays exactly the same. Of course there is a fan and the heating element resistance changes slightly with temperature. With this forum I didn't think it was necessary to point this out.
My point was about the exact same heater, used on different voltages. Again, the resistance of the heating element stays (roughly) the same so the lower the voltage the lower the wattage and amperage. Again again, all you have to do is look at the ratings of electric baseboard heaters or even wall heaters. Same even goes for water heaters. We often get question about using 240v heaters on 120v.

 

[hj]

quote; Trying to heat a house or even a small room with these items will (notice the use of the word will) result in a fire.

I have been using one in my office for YEARS, so, since you are so sure it is going to happen, WHEN is that fire going to happen. I would like to know so I can prepare for it.

 

[DonL]

quote; Trying to heat a house or even a small room with these items will (notice the use of the word will) result in a fire.

I have been using one in my office for YEARS, so, since you are so sure it is going to happen, WHEN is that fire going to happen. I would like to know so I can prepare for it.

I have one in every room of my house.

I only run them on Low, and have a smoke / fire alarm near all of them.

I have one with nice Electronic control, and it will adjust for duty cycle. It is made to safely heat a room.