2-wire Throughout House - What Are My Options? - Electrical - Page 2 - 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 04-10-2010, 09:04 AM   #16
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

2-wire throughout house - what are my options?


All depends upon what you want
A GFCI will give you GFCI protection, nothing more
It will not provide any kind of ground path

If at all possible I would run a circuit for the computer equipment
But there are probably plenty of houses with 2 wire circuits & PC's running

Advertisement

Scuba_Dave is offline   Reply With Quote
Old 04-10-2010, 10:12 AM   #17
Civil Engineer
 
Join Date: Mar 2009
Location: Boston
Posts: 4,309
Rewards Points: 2,196
Default

2-wire throughout house - what are my options?


The purpose of an independent equipment ground is to protect people from shock in the event that the metal casing of a piece of equipment becomes energized. This is quite different than the purpose of a GFCI or AFCI. As previously noted, a GFCI on an ungrounded circuit will not provide an independent equipment ground, however it will shut off the circuit in the event that there is more than a 5 milliamp difference in current between the hot wire and the neutral. This situation would occur in the event the hot wire was in contact with the case, and the circuit was operating.

However, if the hot wire touched the metal box, and the circuit was not energized, i.e. nothing was plugged in, I don't think the GFCI would trip (perhaps an electrician confirm this or correct it). As I understand it, that is the purpose of the independent equipment ground (IEG), if the box becomes energized, the IEG creates a safe path for fault current to reach the main ground at the panel. The GFCI does not provide this.

I had the same situation at my house, lots of two wire circuits with no IEG. I replaced the circuits that had no IEG with new wiring, and replaced the second floor panel with a panel that had a separate IEG bar. Lots of work, but I hope it added some safety to the system.

As for computer equipment, if you are concerned about surges, get a surge protector. If you are really concerned, spring for a battery backup system with integrated surge protection. Either one will do more to protect your computer system than adding a ground. The ground is for your protection, not the equipment.
Daniel Holzman is offline   Reply With Quote
Old 04-10-2010, 10:23 AM   #18
Member
 
Join Date: Jan 2009
Location: South of Boston, MA
Posts: 17,248
Rewards Points: 2,000
Default

2-wire throughout house - what are my options?


Good point, I have always had my computer on a UPS

I also have a UPS on my TV
It was actually free after rebate
Scuba_Dave is offline   Reply With Quote
Old 04-10-2010, 10:33 AM   #19
Master Electrician
 
Join Date: Mar 2010
Location: Indiana
Posts: 2,978
Rewards Points: 2,212
Default

2-wire throughout house - what are my options?


Do not both UPS and surge suppression devices require a grounding connection to function properly?
brric is offline   Reply With Quote
Old 04-10-2010, 01:54 PM   #20
Civil Engineer
 
Join Date: Mar 2009
Location: Boston
Posts: 4,309
Rewards Points: 2,196
Default

2-wire throughout house - what are my options?


I have read differing claims on whether a surge suppressor will work without a ground. One claim, by a seemingly knowledgable writer, was that high quality surge suppressor control lightning strikes by shunting voltage from one wire to another, and will work without a ground. Others have claimed that no surge suppressor will work correctly without a ground. So this seems to be a point of contention. Everyone seems to agree that a proper ground is a very good idea, however is it essential to allow a surge suppressor to work is, at least in my mind, an open question.

An uninterruptible power supply performs a different function, namely it is designed to keep your system operational during power failures. Many UPS systems also include surge suppression, and I have seen several posts saying that all UPS systems need to be grounded.

Bottom line, for a computer or other sensitive electronic equipment, I would spring for a good ground.

Advertisement

Daniel Holzman is offline   Reply With Quote
Reply

Tags
2 wire , 2-wire , old electrical wiring , replace wiring , two wire


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
Cape Cod Style House Attic/Crawl Space Insulation Help Danielg Insulation 24 05-21-2012 09:20 AM
direct bury wire from house to garage??? help vinylman70 Electrical 30 01-20-2010 10:44 PM
Please Help with Outdoor Lamp/ Sensor hcjoak09 Electrical 2 12-16-2009 11:49 PM
DSL slow inside house - wiring options mcvane Electrical 18 07-14-2008 04:15 PM
Old house, new light fixture, too many wires Persephonee Electrical 3 01-15-2007 09:58 AM




Top of Page | View New Posts