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The Water Cooler
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Electrical question
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<blockquote data-quote="Perplexed" data-source="post: 3230397" data-attributes="member: 7157"><p>Ok, so I pulled the cover off the breaker box in my shop to look at the wiring layout. This box has a 200 amp supply coming from a two-pole breaker in the next box upstream, with 100amps on each pole. The two hot wires are connected to the breaker bus. So far, so good. There are a mix of 120/20 single pole breakers, a 240/30 two pole breaker, and a 240/50 two pole breaker. The two 240 circuits were installed by a licensed electrician since I moved in, and all circuits have worked with no issues. </p><p></p><p>The thing that has me scratching my head is the presence of only one ground (neutral?) bar in the box. The 120V circuits all have a green wire going to this bar, so I assumed it was the ground bar. However, the 240V circuits have a white and a white/black striped wire each, with all four going to the same bar as the green wires. These two circuits also have a pair of black wires, the hots of course, going to each pole of their respective breakers. One of the 240V circuits is used by the air compressor, and the other by the welder. I’m guessing that since the electrician added these two circuits to an existing layout, it must be ok. </p><p></p><p>Or is it not? What’s the deal with a single bar and the green, white, and white/black wires all going to the same bar?</p></blockquote><p></p>
[QUOTE="Perplexed, post: 3230397, member: 7157"] Ok, so I pulled the cover off the breaker box in my shop to look at the wiring layout. This box has a 200 amp supply coming from a two-pole breaker in the next box upstream, with 100amps on each pole. The two hot wires are connected to the breaker bus. So far, so good. There are a mix of 120/20 single pole breakers, a 240/30 two pole breaker, and a 240/50 two pole breaker. The two 240 circuits were installed by a licensed electrician since I moved in, and all circuits have worked with no issues. The thing that has me scratching my head is the presence of only one ground (neutral?) bar in the box. The 120V circuits all have a green wire going to this bar, so I assumed it was the ground bar. However, the 240V circuits have a white and a white/black striped wire each, with all four going to the same bar as the green wires. These two circuits also have a pair of black wires, the hots of course, going to each pole of their respective breakers. One of the 240V circuits is used by the air compressor, and the other by the welder. I’m guessing that since the electrician added these two circuits to an existing layout, it must be ok. Or is it not? What’s the deal with a single bar and the green, white, and white/black wires all going to the same bar? [/QUOTE]
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