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Old 01-03-2012, 03:19 PM   #1
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MWBC and double taps


Included a pic that will hopefully help.
I have 2 cables that have 3 wires each, each cable is sharing a neutral(MWBC).
the 2 wires with the green line is 1 cable.
the 2 wires with the blue line is the other cable.
I wanted to remove "wire 4" because i wanted the breaker space and im rewiring the family room, and wire 4 will only have 1 outlet and 1 bulb on it, which could be added to another circuit.
Ignore the wire marked "seperate circuit". i can move that.
My goal was to have that "wire 4" breaker slot empty and eliminate double taps.
Breakers are GE type TQL, cant find anything about them listed for 2 wires.
Ive been reading about MWBC and i guess im just looking for the simplest answer. can use a tandem breaker for each mwbc?
am i screwed, should i just leave it alone and find another slot to use?
myabe pigtails?
Please let me know if i can furnish more info, its kinda hard to get it from my head to my keyboard.
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Old 01-03-2012, 03:40 PM   #2
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MWBC and double taps


Sorry but I am lost, all the lines look green.

A MWBC is connected to a 2 pole breaker (or 2 single pole breakers on different legs). Meaning the red wire is connected to 1 pole and the black wire the other. I see 2 black wires connected to 1 single pole breaker and 2 red wires connected to another. That is not a MWBC.

Or are you saying you have 2 different MWBC's connected to the same 2 breakers?

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Last edited by rjniles; 01-03-2012 at 03:42 PM. Reason: added the question
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Old 01-03-2012, 03:40 PM   #3
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MWBC and double taps


If you know what your doing with mwbc than you can use a quadplex beaker. Remember each leg of the mwbc needs to be on a separate phase!!
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Old 01-03-2012, 03:47 PM   #4
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MWBC and double taps


1 black and 2 red is one cable.
3 red and 4 black is another cable.
the 2 wires with the electrical tape on each is 1 cable entering the panel.
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Old 01-03-2012, 04:04 PM   #5
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MWBC and double taps


As I saw it the two multiwire branch circuits are connected to three different breakers.

The setup should be modernized with both MWBC's connected to the same double wide double breaker with handles tied together (or each MWBC connected to its own double wide double breaker with handles tied together).

Did someone mention a double wide quad breaker with handles 1 and 4 tied together for one MWBC and handles 2 and 3 tied together for the other MWBC?

A single wide double (tandem) breaker may not be used for both legs of one MWBC.
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Last edited by AllanJ; 01-03-2012 at 04:11 PM.
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Old 01-03-2012, 04:43 PM   #6
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MWBC and double taps


Yes, 2 MWBC on 3 breakers. lol, im trying to make a space and now i might have to use up 4 slots just for these cables....i hate the electrical in my house. ive fixed so many bad things already. i like the quadplex breaker idea. it only takes up 2 normal slots right? like the one in the pic. im not afraid to do the work as long as there are some instructions with the breaker or someone gives an answer here.

The breaker in the pic, 1 and 4 is for one MWBC and 2 and 3 is for the other MWBC?
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Old 01-03-2012, 05:18 PM   #7
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MWBC and double taps


Choose a breaker where, if you flip #1 off then #4 also goes off (and vice versa) and if you flip #3 off then #2 also goes off (and vice versa).
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Old 01-03-2012, 05:25 PM   #8
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MWBC and double taps


sounds good to me. eleminates the double taps and i can still make a space available.

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