Damp Vs. Dry Locations - Electrical - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Electrical

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 05-18-2011, 10:33 PM   #1
Member
 
Join Date: Aug 2006
Location: Cincinnati, OH
Posts: 78
Rewards Points: 75
Default

Damp vs. Dry locations


I am installing a ceiling fan and lighting under a new outdoor patio cover. The lights and fan are damp-rated. I am intending on installing a single-gang combination switch/dimmer that has a dimmer for the lights and a multi-speed switch for the fan. However, I can't find one that is damp-rated for outdoor installation. I will be installing the switch in an outdoor-rated box with an "in-use" type cover and it will be under the roof cover in a location that likely will never, ever be exposed to direct liquid (rain, snow, whatever).

I know that a UL rating is a UL rating and all the responsible people here will want to tell me "NO!", but what would be the implications if I installed the "dry location"-rated switch outdoors in the "safe" location? Obviously the only concern is humidity in the air... but how is that different from someone who doesn't have central air conditioning, lives somewhere humid, and always has the windows open? The electrical engineers in my office say (off the record) that it's probably fine and that UL is probably covering their rears, and nothing more. But is there something unique in a rheostat-type dimmer switch that would react negatively to humidity? Just looking for any practical experience, if anyone here has any, with this situation. What could go wrong with this switch that wouldn't go wrong with a plain old switch or receptacle in an outdoor damp location?

Advertisement

pjpjpjpj is offline   Reply With Quote
Old 05-18-2011, 11:20 PM   #2
Scared Electrician
 
Saturday Cowboy's Avatar
 
Join Date: Nov 2009
Location: Colorado
Posts: 715
Rewards Points: 500
Default

Damp vs. Dry locations


In a box with an in-use cover on it is considered a dry location, so use of a standard switch/dimmer in this case would be ok. I would however recommend that it be protected by a GFI. It might be even required.

Advertisement

__________________
Ragged Trousered Philanthropist


Please follow the code - its there for your safety no matter how inconvenient.
Saturday Cowboy is offline   Reply With Quote
Old 05-19-2011, 10:52 AM   #3
Member
 
Join Date: Aug 2006
Location: Cincinnati, OH
Posts: 78
Rewards Points: 75
Default

Damp vs. Dry locations


Quote:
Originally Posted by Saturday Cowboy View Post
In a box with an in-use cover on it is considered a dry location, so use of a standard switch/dimmer in this case would be ok. I would however recommend that it be protected by a GFI. It might be even required.
Thanks - I will have it GFCI-protected.

The website where I was looking at switches/dimmers had a pop-up link explaining "dry", "damp", and "wet/outdoor" per the UL ratings and the dry explanation indicated a place where there would not be humidity - not even a bathroom. That sounds to me like the outdoor "in use" cover would not be "dry". But, as I said above, what about people with no AC and open windows? The switch will have the same exposure as those.

Thanks.
pjpjpjpj is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Damp Insulation in Attic wiz561 Building & Construction 6 12-24-2010 12:16 AM
GFCI: Not For Use in Wet or Damp Locations? Scuba_Dave Electrical 11 05-07-2010 11:13 PM
Bubbling paint on ceiling caused by damp bathroom floor garv19 General DIY Discussions 4 04-10-2010 08:38 AM
Damp walls - should I use foil bubble wrap!? thenap80 Building & Construction 7 12-19-2008 12:40 AM




Top of Page | View New Posts