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Thread: Can this 112.5 kVA transformer be in the attic space?

  1. #11
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    Oct 2014
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    Quote Originally Posted by tw1156 View Post
    You note that the OCPD's for the secondary are from readily accessible panels on the floor; have you confirmed if you also meet 240.21 for the length of those secondary conductors (240.21(C)(2)), although I'm not sure what your facility is. During design, I always look to see what it would take to replace the transformer in the future as well so access, widths of doors, etc, are also things to take into account.
    The length of the secondary conductors is more than 10ft but less than 25ft and it complies with 240.21(C)(6).

  2. #12
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    Jul 2017
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    I just wasted thirty minutes of my time reading thru this thread most answers have nothing to do with OP question but are being funny. I should have bought milk and took my dog for a walk within that time. What can you do? Oh well such is life.

    Sent from my SM-G935U using Tapatalk
    Last edited by codequestion; 06-11-18 at 08:15 PM.

  3. #13
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    Apr 2009
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    To answer your questions regarding the door and ladder, I think a little Common Sense may come into play here... If this transformer ever fails and has to be taken out, you do not want to have to cut the ceiling open to remove it, so it stands to reason the door /hatch needs to be at least size of the transformer. As far as a ladder goes, I do not think one is required, and a ladder that is built in to the hatch will be in the way of getting a new transformer in or out anyway.

    The last custom home we did had two HVAC units in the attic... The hatch was big enough that the units could come through it.

    Personally, I find that any type of equipment located in attic is an extremely poor design choice. I hope there is a crane and gantry up there to move the thing should the need arise.
    Electricians do it until it Hertz!

  4. #14
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    Dec 2007
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    Quote Originally Posted by JFletcher View Post
    To answer your questions regarding the door and ladder, I think a little Common Sense may come into play here... If this transformer ever fails and has to be taken out, you do not want to have to cut the ceiling open to remove it, so it stands to reason the door /hatch needs to be at least size of the transformer. As far as a ladder goes, I do not think one is required, and a ladder that is built in to the hatch will be in the way of getting a new transformer in or out anyway.

    The last custom home we did had two HVAC units in the attic... The hatch was big enough that the units could come through it.

    Personally, I find that any type of equipment located in attic is an extremely poor design choice. I hope there is a crane and gantry up there to move the thing should the need arise.
    But floor space is too valuable for necessary things like HVAC equipment.
    I live for today, I'm just a day behind.

  5. #15
    Join Date
    Oct 2014
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    Quote Originally Posted by JFletcher View Post
    To answer your questions regarding the door and ladder, I think a little Common Sense may come into play here... If this transformer ever fails and has to be taken out, you do not want to have to cut the ceiling open to remove it, so it stands to reason the door /hatch needs to be at least size of the transformer. As far as a ladder goes, I do not think one is required, and a ladder that is built in to the hatch will be in the way of getting a new transformer in or out anyway.

    The last custom home we did had two HVAC units in the attic... The hatch was big enough that the units could come through it.

    Personally, I find that any type of equipment located in attic is an extremely poor design choice. I hope there is a crane and gantry up there to move the thing should the need arise.
    Thanks for your thoughts.

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