Electrical Wiring in the Home/furnace conversion from gas to electric
Expert: PASCACK VALLEY ELECTRIC Bob Mossman - 1/17/2014
Question I'm installing a new air handler (Goodman MBR 2000) in my home. I ordered a 15 kw heat strip kit (HKA-15C) to put in it. The kit has 2 breakers inside the air handler. (a 50 amp and a 25 amp) Instead of running 2 circuits with a #6 for the 50amp and a #10 for the 25amp they make a terminal block (SPW-01) to just run one circuit from the breaker panel to the air handler. I'm not sure if this just a terminal block, a power distribution terminal, or what so I'm trying to find out if I will need to run a larger wire than a #6 from panel to handler. a Guy from Hacy HVAC Supply has told me that all I need is the#6 and a 60amp in the breaker box. That the sequencers will rotate the heat strips where it won't ever pull more than 50amps. It seems like if I am using 15kw all three strips will be on together? I need to find out exactly what size wire and breaker I need to install the SPW-01 to keep me from running 2 lines. I donít want to run a #6 and find out it's not big enough. Would you please help me?
15KW divided by 240 = 62.5 amps. As you can see a 60 amp line to the heater will not be enough if both heat "stages" run at the same time. Assuming that is the case you would need to run a 4-2 Romex to the heater with an 80 amp breaker. As a matter of fact I just looked this unit up on the internet and thats exactly what they call for, an 80 amp line for this particular unit and they say it is a 2 "stage" heater meaning either one or both heating elements (25 or 50) is operating together or separately. Its not clear which element is the one that operates by itself as one of the two stages but my guess would be the bigger one.
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Education/Credentials "The Frank Williams School of Electrical Construction". My dear old boss is 100 ! and still going God Bless him. I started working for "Tenafly Electric" right out of high school at 19. He was tough but I learned more working for him in 8 and half years than most guys. We did mostly industrial work while doing some commercial and residential so I was fortunate to be exposed to all 3 areas of electrical construction. The guys I worked with were all good guys and I stay in touch with some of them still. Most of us went into our own buisness's which says something about the caliber of the guys I worked with. We had some interesting clients : Wella Corp. of shampoo fame, Farah Fawcett etc, I didn't buy shampoo for 10 years. It was a great place to work. Pan Am the former airline just before they went under, another great place to work, nice clean environment. C&C Metals, the largest button manufacturer in the US at that time, a not so clean environment but a very interesting place to work, lots of machine's cranking out buttons of all kinds but you had to be on your toes, it was a potentially dangerous place to be . All kinds of action going on around you.