How Do You Build A 'damp OK' Lamp? - 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 08-31-2009, 05:13 PM   #1
Member
 
Join Date: Jul 2007
Posts: 121
Rewards Points: 75
Default

How do you build a 'damp OK' lamp?


I understand lamps come in 3 "grades" by UL/code: regular, okay in damp location, and okay in wet location.

When I looked at the insides of the outdoor spotlight fixtures, while replacing them, it seemed that all that they had were:
1) a plastic sleeve extending beyond the bulb socket/contact, and
2) some had either a metallic-/reflective-sided fiberglass batting or a rubber foam gasket up at the footing that touches the soffit (up where the wires connect to the house wires).

That didn't seem like much. Is that all it takes for a wet location? What is needed for a damp one then?

Advertisement

1655graff is offline   Reply With Quote
Old 08-31-2009, 05:26 PM   #2
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

How do you build a 'damp OK' lamp?


Quote:
Originally Posted by 1655graff View Post
What is needed for a damp one then?
Rigorous testing.

Advertisement

Yoyizit is offline   Reply With Quote
Old 09-01-2009, 12:42 PM   #3
Member
 
Join Date: Jul 2007
Posts: 121
Rewards Points: 75
Default

How do you build a 'damp OK' lamp?


Which tests?
1655graff is offline   Reply With Quote
Old 09-01-2009, 01:02 PM   #4
Member
 
Join Date: Jul 2008
Location: NW of D.C.
Posts: 5,990
Rewards Points: 2,000
Default

How do you build a 'damp OK' lamp?


Quote:
Originally Posted by 1655graff View Post
Which tests?
UL and other agencies test to standards written by yet other agencies and use large laboratories to run the tests, which have evolved over decades to assure safety [while keeping to some societal cost/benefit calculation] for maybe 97.5%
http://en.wikipedia.org/wiki/File:Th...stribution.svg
of the population.
For electrical matters the IEEE is probably involved somewhere in the hierarchy. Also the ASTM and maybe NIST.

Nothing in those fixtures is there by accident and we've considerably progressed since the days of Bakelite.

Last edited by Yoyizit; 09-01-2009 at 01:15 PM.
Yoyizit is offline   Reply With Quote
Old 09-01-2009, 01:42 PM   #5
Member
 
Join Date: Jun 2007
Posts: 3,510
Rewards Points: 2,008
Default

How do you build a 'damp OK' lamp?


If they are rated for wet like yours are, then they are automatically rated for damp.
J. V. is offline   Reply With Quote
Old 09-05-2009, 10:44 PM   #6
Member
 
Join Date: Aug 2009
Posts: 75
Rewards Points: 75
Default

How do you build a 'damp OK' lamp?


To me, a damp location is were water cannot under normal condiitons reach the light bulb.

If you want a bare bulb outside, buy a rough skin bulb. These are bulb
made with a heat resistance, plastic outer shell that is wrap around the bulb. Good to use in a Trouble Light, you drag around, and use it to see
in dark Crawl Spaces.

A bare rough service bulb, hidden behind a glass/plastic globe is also okay to to used. A normal household bulb can also be use. I also like to get
bulb rated at 130 volts compare to 120 volts, they seen to last longer.

When selecting a bulb, never exceed the MFG. wattage recommendation printed on the light fixture bulb socket.
Ranger31 is offline   Reply With Quote
Old 09-05-2009, 11:29 PM   #7
Registered User
 
Termite's Avatar
 
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000
Default

How do you build a 'damp OK' lamp?


The fixture itself is what gets the rating for damp or wet locations, not the bulb. Yoyizit pretty much covered what's involved. There are imported fixtures that do not get the necessary testing however, and would usually be considered sub-par.

Advertisement

Termite 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
Two Circuits in one Box? GFI for lamp post? Burbman Electrical 4 05-13-2009 04:59 PM
Fluorescent lamp flickering Ash Electrical 11 08-03-2008 08:35 PM
electric wiring for fluorescent lamp toronbolo Electrical 3 03-24-2008 01:16 PM




Top of Page | View New Posts