Electrical – Any issues wiring bathroom exhaust fan to low-voltage heated mirror

bathroomelectricalexhaust-fanwiring

I'm in Maryland, US.

I was hoping to wire from the switch:

https://smile.amazon.com/gp/product/B01CXXZV96/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

to this:

https://www.clearmirror.com/product-page/shower-clearmirror

I would like my shower heated mirror to come on when I turn on the exhaust fan. Some other models of the exhaust fan recommend not wiring up other devices. But I'm hoping it's possible because A) the same recommendation is not mentioned in this model and B) the heated mirror is low voltage.

Is there any problems with this?

EDIT: now it seems like the main issue will be pluging in the mirror transformer to code. Is it against code to put an access panel to access an outlet either in the ceiling or in a wall? This is how they seem to be doing it in their video:

https://www.youtube.com/watch?v=DdqB57r1Y0k

Planned steps:

  1. wire existing 12/2 romex to exhaust fan (original leg to old exhaust fan) via pig tails and secure in recessed junction box secured to ceiling joist
  2. connect 12/2 romex from this junction box to outlet which will be b̶e̶h̶i̶n̶d̶ ̶t̶h̶e̶ ̶d̶r̶y̶w̶a̶l̶l̶ (see edit above)
  3. secure plug-in power supply from heated mirror into this outlet

If there are any issues, NEC considerations, or any other relevant information, any information would be GREATLY appreciated. Thanks!

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Best Answer

You can have a removable access panel to mount the transformer in the wall if it is rated for being enclosed. Some transformers are not listed for being enclosed. Most transformers similar to this are mounted on a junction box with the 120v inside and the low voltage on the outside in this case a full wave bridge may be integrated in the transformer or connected to it and the 24vdc is taken to the mirror for the heat and light.

I make “picture frame” access panels I have always used Velcro to hold them in place. An inspector did recommend screws as they are allowed. Removable panels designed for access that do not damage the finish are code compliant. So if the transformer is allowed in a stud bay you could create a “picture frame” attached to the Sheetrock but the frame covers the seam. Velcro or screws can be used to hold this in place.

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