10 kw heat

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tdh0

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nameplate-mca - 54 ;mcb - 60 :6-2- romex failed inspection
where in code book is he getting this
 
where

where

I originally said 334.80 but that has NM as 55...so now I have no idea...other than I do know inspectors who require the wire to be as larger as the beaker rating,,,,,not saying it should be,,,saying I know some who think so.
 
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10 kw

10 kw

i am calling him now
all over fl they are starting to require 6-2 seu
have headache trying to find out where they are coming from
 
What type of building is this heater in? Is the installation normally dry? Cable route? Can you tell us a little more about this installation.
 
From the scant details your installation sounds compliant. What exactly is the violation?
 
Pierre, Pierre, Pierre .... tsk, tsk.

LOOK AT THE THREAD TITLE !!

We are dealing with a 10 kw heat load here!

The 54 Amp rating already has been adjusted by the required 125%

10,000 watts divided by 230 Volts = 43.4 Amps

Multiplied by 125% = 54.25 Amps

You are adding this factor in a 2nd time here .... :mad:

Edit to add:
If you were to use 240 Volts for your calculation, you end up with 52 Amps, then you can allow a couple more amps for the blower motor, making the minumum circuit ampacity come out to 54 as the nameplate stipulates.
 
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kbsparky said:
Pierre, Pierre, Pierre .... tsk, tsk.

LOOK AT THE THREAD TITLE !!

We are dealing with a 10 kw heat load here!

The 54 Amp rating already has been adjusted by the required 125%

10,000 watts divided by 230 Volts = 43.4 Amps

Multiplied by 125% = 54.25 Amps

You are adding this factor in a 2nd time here .... :mad:

Edit to add:
If you were to use 240 Volts for your calculation, you end up with 52 Amps, then you can allow a couple more amps for the blower motor, making the minumum circuit ampacity come out to 54 as the nameplate stipulates.
Click to expand...




Ahh... I am being extra safe...maybe a little lazy...how about I did not do the math and ASSumed the numbers...:grin:


Thanks KB for pointing that out.
 
Actually I have never seen a 10kw heat strip. What they call 10 kw is usually a 9.6kw heater but that may vary by brand.

Thus-- 9600/240=40 40*1.25= 50amps plus the motor load.

Either way #6 is good for 55 amps and a 60 amp breaker is allow. Tell the inspector to look at art. 240.4(B)
 
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