50 amp breaker box

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50 amp breaker box

Home > Discussion Forum > Mechanic's Corner - Electrical

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All Messages in Thread	Author	Date
50 amp breaker box	Scott	9-2-07
Can anyone tell me why 2 of the 6 slots for breakers in the breaker box are dead? I can take a "known good" breaker from the dead slot and place it in the next slot and all is fine. Thanks alot
Re: 50 amp breaker box	Mike Dean	2-3-08
Your Breaker box is set up for 3 phase power (three hots, one common, and one bare wire neutral) and you only have either two phase (2 hots, one common, and one bare wire neutral), or single phase (1 hot, one Neutral, and one bare ground feeding it; If you have a "Main Breaker" panel, Check the main breaker. If it has 3 breaker elements, you have a 3 phase panel. If all three phases on the main breaker have wires going to them, check the voltage at the breaker lugs. you will probably find one dead one. If all three have power, one of the breaker elements is bad. Replace breaker. If the breaker has only two wires, then you are feeding the 3 phase panel with 2 phase (240V/120V 3 wire, with ground). The dead breakers are bussed to the missing phase. If you have a "Main Lug" box, Check at the top of the breaker strip, you should see three big input lugs. Only two of these will have wires in them. If you have a 240/120 3 wire/w gnd coming in, you will see a wire on two of them. The lug with the missing wire is bussed to the dead breakers. If you have 120 single phase coming in you will see one lug with an incoming wire in it and a jumper over to one of the other two lugs. As above the lug missing a wire is the one feeding the dead breakers.