Sub panel, cooktop, wall oven questions


  #1  
Old 03-21-04, 04:19 AM
j123
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Sub panel, cooktop, wall oven questions

A friend of mine is remodeling his kitchen and replacing the gas range/oven with an electric wall oven and a separate cooktop. Since the 100A main panel has no empty slots he wants to add a sub panel and switch some circuits from the main panel to the sub panel to make room for the subpanel, cooktop and oven breakers.

Let's start with the sub panel. The sub panel will be right next to the main panel. He has bought a 60A double pole breaker to install in the main panel and copper stranded 8/3 w/ground wire to connect between the 60A breaker and sub panel. I'm thinking this should be 6/3 w/ground? Does this wire need to be in a conduit?

The label on the cooktop says 6.1 KW 208Y 60Hz and 8.1 KW 240Y 60Hz. I'm assumming 240Y means 240 volts. Is the 208Y for another country or something? What is the correct wire size/type and breaker size for this circuit? It will need about 12 feet of wire.

The label on the oven says 2.7 KW 208Y/120V 60Hz and 3.9 KW 120/240V 60Hz. I'm assuming this means it can run on either 120 volts or 240 volts. 240 volts would be better, right? What is the correct wire size/type and breaker size for this circuit? It will need about 22 feet of wire.

Thanks!

j123
 

Last edited by j123; 03-21-04 at 06:22 AM.
  #2  
Old 03-21-04, 09:30 PM
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Before you proceed to far what other big loads are in the house {central A/C,waterheater,etc.}you dont want to overload the main service. As far as wire size goes I would not go any smaller than #6 copper {type THHN rated at 75amps} only in conduit if using individual conductors. 208volts is used in commercial/industrial applications. The cooktop amperage is found by 8,100watts divided by 240volts = 34amps =#8awg= 40amp breaker.
the differnece between 240volts & 120volts is that 240volts allows you to use a smaller gauge wire. 3,900 watts divided by 240volts =16.25amps = #12awg = 20amp breaker.If you wer to use 120volts: 3,900watts divided by 120volts = 32.5amps=#8awg = 40amp breaker.
 
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Old 03-23-04, 12:32 AM
j123
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Thanks for the reply. There's no A/C. Other 240V appliances would be an electric water heater, the water pump (drilled well) and dryer. Then there's a refrigerator, washing machine and dishwasher. Any idea why the cooktop label says 240Y and not 240V?

j123
 
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Old 03-24-04, 01:40 PM
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The "Y" may be a reference to the type of connection the manufacturer used when wiring the unit.As long as its wired properly on your end I wolud not be concerned.
 
 

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