Proper Calculation For Circuit Size - Electrical - DIY Chatroom - DIY ...

I am about to run wire for 8kw double oven, 120/240 4 wires, 80 feet one way. instruction says 'protection circuit recommended 40A'. However, i want to double check with calculation. not sure which method to use or none at all.

method A
8000 / 240 = 33.33
then
33.33 x 1.25 = 41.66
go for 50 amp breaker???

50 amp breaker x .8 = 40 amp limit.

method B
10% over 8kw
hence
8000 x .1 = 8800
8800 / 240 = 36.67
go for 40 amp breaker???

method C, no calculation needed, variance already built in???

Source: http://www.diychatroom.com/f18/proper-calculation-circuit-size-133640/

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