ptonsparky
Tom
- Occupation
- EC - retired
Plus, they lime up pretty quickly unless you're running a water softener.
Tankless Electric Water heater and 150 amp service
- Thread starter Greg1707
- Start date
- Status
Greg1707
Senior Member
- Location
- Alexandria, VA
- Occupation
- Business owner Electrical contractor
I have been working on a load calculation for this condo. There is an electric furnace on a 60 amp breaker. Is it safe to assume that would be 11,520 VA? 60 amps x .80=48 x 240= 11,520. '
readydave8
re member
- Location
- Clarkesville, Georgia
- Occupation
- electrician
ptonsparky
Tom
- Occupation
- EC - retired
Most furnaces have a label, somewhere.
Probably close enough for a load calculation.
Mike's calculator for a "10kw" + blower is 10,800.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
A majority of heat strips that are called 10 kW typically has actual heat capacity of 9.6 kW of heat. If there is blower on same circuit it is usually no more than about 2 amps.
On top of that NEC makes us treat the heating as a continuous load so conductor and overcurrent device will be 125% of the normal load.
That usually leads to 9.6kW @ 240 = 40 amps x 1.25 = 50. Can put a 9.6 kW heat strip on 50 amp circuit, but if there is also a blower on same circuit will need to be 60 amp OCPD. That said if using NM cable that must be sized per 60C ampacity - #6 is good for 55 amps, so it can still handle the heater plus no more than 5 amps blower or other accessories and still be protected by a 60 amp OCPD.
So actual VA is probably right near 10k including the blower in majority of them.
Tulsa Electrician
Senior Member
- Location
- Tulsa
- Occupation
- Electrician
Since your working with 240 volt in the math. I take it your service voltage is 120/240 for the condo.
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