Attic Exhaust Fan wiring

Discussion in 'Electrical and Wiring' started by PromethusBound, Jun 13, 2017.

  1. Jun 13, 2017 #1

    PromethusBound

    PromethusBound

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    With the summer heat we have noticed our 2nd floor isn't cooling off. I took a look in our attic and noticed the exhaust fan isnt running. Opened the junction box and noticed one of its white wire was disconnected. The Black wire is connected. Testing the power the only live wire is red. I do see two sets of white wires.

    20170613_130119.jpg
     
  2. Jun 13, 2017 #2

    nealtw

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    Do you have a main floor switch and if you do can you fiure out which set of wires go to or come from the switch?
     
  3. Jun 13, 2017 #3

    Snoonyb

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    The fan will not operate w/o the white conductor connected.

    However, you have the option of determining, if, there is a switch leg, or, install a temperature controlled switch, at the open "J" box, instead of a mechanical switch.
     
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  4. Jun 13, 2017 #4

    nealtw

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    Have you ever had this fan running before.
    If yes and nothing was changed you might look in the wire nuts on the white wires to see if a wire just broke leaving some evidence where it was.

    There are just to many wires to say this is easy, this box could also be a junction box for another circuit or something.
     
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  5. Jun 14, 2017 #5

    Snoonyb

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    Where is the neutral conductor, from the BX, which is sticking up in the air, connected?
     
  6. Jun 14, 2017 #6

    nealtw

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    Why is there an extra black wire.:confused::confused::)
     
  7. Jun 14, 2017 #7

    Snoonyb

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    I've identified where the white conductor, which is not connected is, so; "Where is the neutral conductor, from the BX, which is sticking up in the air, connected?"
     
  8. Jun 14, 2017 #8

    nealtw

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    Are you assuming the BX is going to the fan?
     
  9. Jun 14, 2017 #9

    Snoonyb

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    Only if that would be a clue why the fan isn't operating.
     
  10. Jun 14, 2017 #10

    nealtw

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    Just not enough info for me to make a suggestion.

    We don't know if the OP knows the whole story. I will wait for him to come back with some answers.
     
  11. Jun 14, 2017 #11

    Snoonyb

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    In post #2 you asked about a switch.

    A switched load requires a neutral connection to operate.
     
  12. Jun 14, 2017 #12

    nealtw

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    So far I agree with every thing you are seeing but I am thinking that someone else may have disconnected it for a reason.
     
  13. Jun 14, 2017 #13

    Snoonyb

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    It doesn't appear to have ever been connected.
     
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  14. Jun 14, 2017 #14

    afjes_2016

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    I noticed that there are conductors coming out of the bottom conduit and going right back out the top one as in a "loop". Hard to make out what conductors are from what conduit etc.
    Also I would not assume that any of the conductors going through the conduits are for specific functions such as white will be neutral, black hot etc (nothing is marked). as we don't know who ever put this together did not just use more red because they had more of that color than white etc.

    We also don't know if this ever worked before or just stopped working suddenly. We also don't know if there is any type of thermostat connected somewhere else and there seems to be a lot of wires to just control one attic fan so that means something else is running off the circuit beside the attic fan. The OP has to trace where these wires are coming/going and let us know.
     
  15. Jun 16, 2017 #15

    PromethusBound

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    As far as I know, this fan never ran. This is my first time up there and when I opened the junction box feeding it I found that white wire disconnected. I am pretty sure the fan itself is dead or seized. Unfortunately, the motor doesn't have any markings. I may just replace it with a solar power fan.
     
  16. Jun 16, 2017 #16

    oldognewtrick

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    My experiences with solar fans are they move very little air, don't work at night and ineffective. We quit using them for installations.
     
  17. Jun 16, 2017 #17

    Snoonyb

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    If you have not, and do not connect the white conductor, how do you know the condition of the fan?
     
  18. Jun 16, 2017 #18

    nealtw

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    Promethus defied the gods and gave fire to the humans, you want to be care full you might be giving it back:p
     
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  19. Jun 16, 2017 #19

    Snoonyb

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    But he's just bound, and not there yet, so he may be surprised to find the METHUSELAH, is my younger brother.
     
  20. Jun 16, 2017 #20

    slownsteady

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    OP: can you confirm that the BX running up and to the left is going to the fan?
     

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