Grounding Question - Electrical - DIY Chatroom Home Improvement Forum

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


Thread Tools Display Modes
Old 03-14-2009, 11:21 PM   #1
Join Date: Mar 2009
Posts: 780
Rewards Points: 500

Grounding question

Something that has vexed me for a while now. Why are mounted fixtures like ceiling lights or wall scounces grounded but table lamps aren't?


hayewe farm is offline   Reply With Quote
Old 03-15-2009, 04:48 AM   #2
Master Electrician
JohnJ0906's Avatar
Join Date: Mar 2007
Location: Baltimore, MD
Posts: 332
Rewards Points: 250

The answer probably lies with the fact that the National Electric code applies to hardwired/permanently mounted fixtures, but doesn't apply to lamps at all.

The NEC requires light fixtures to be grounded.


John from Baltimore
One Day at a Time
"Experience is what you get when you were expecting something else"
"The bitterness of low quality lingers long after the sweetness of low cost is forgotten"
JohnJ0906 is offline   Reply With Quote
Old 03-15-2009, 08:21 AM   #3
joed's Avatar
Join Date: Mar 2005
Location: Welland, Ontario
Posts: 13,280
Rewards Points: 13,356
Blog Entries: 11

Plug in fixtures undergo UL testing that determines if grounding is needed. Most of the time it is not needed because they are not made out of metal. You can't get a shock from wood or plastic. Plastic ceiling fixtures won't have a ground either.
joed is online now   Reply With Quote
Old 03-15-2009, 10:16 AM   #4
Join Date: Feb 2006
Location: portland, OR
Posts: 151
Rewards Points: 150

I was about to write that a metal lamp will have a third equipment ground prong on the plug. Then I looked at my all metal desk lamp and it doesn't, hmmmm now that is vexing.
I'm gonna hurl myself against the wall
because I'd rather feel bad than not feel anything at all
Warren Zevon
handifoot is offline   Reply With Quote
Old 03-15-2009, 10:30 AM   #5
Electrical Contractor
wirenut1110's Avatar
Join Date: Apr 2008
Location: Chester, VA.
Posts: 1,054
Rewards Points: 510
Send a message via AIM to wirenut1110

I always thought it was because they were considered "double insulated". Here's an excerpt for the definition

Double insulated or class 2 electrical appliances are products that have been designed in a way so as not to require a safety connection to electrical earth (These products must NOT have a safety connection to Earth).
These products are required to prevent any failure from resulting in dangerous voltage levels becoming exposed causing a shock etc. This must be done without the aid of an earthed metal casing. Ways of achieving this include double layers of insulating material or reinforced insulation protecting any live parts of the fitting.
wirenut1110 is offline   Reply With Quote

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
Hot Tub GFCI Grounding Question kearnak1420 Electrical 3 04-30-2008 05:48 PM
Sub-panel grounding question. gesoneguy Electrical 31 02-22-2008 08:25 AM
Anyone want to take a shot at why #6 to attach antenna ground to breaker? Piedmont Electrical 44 01-08-2008 04:11 PM
Another Dumb question - Self grounding outlets robertmee Electrical 9 10-25-2007 01:49 PM
Question on Grounding ayudi General DIY Discussions 2 12-11-2006 04:14 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1