Question on grounding


Old 04-03-15, 03:09 PM
Thread Starter
Join Date: Oct 2010
Location: USA
Posts: 58
Received 0 Votes on 0 Posts
Question on grounding

hi,i'm curios-been reading things here where people aren't sure about to know you really have a good ground
Sponsored Links
Old 04-03-15, 03:12 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 53,203
Received 378 Votes on 355 Posts
Good ground to what in particular..... your electrical service ?
Old 04-04-15, 02:30 PM
Thread Starter
Join Date: Oct 2010
Location: USA
Posts: 58
Received 0 Votes on 0 Posts
thanks for reply.i guess what i meant was how do I know it's grd.the utility brings in 3 wires[one not insulated]that must be grd.once in my box it's connected w/neutral.when I turn on a light current must flow thru the neutral to make complete ckt.and then does it go thru the grd?loc
Old 04-04-15, 03:14 PM
ray2047's Avatar
Join Date: Mar 2006
Location: USA
Posts: 33,597
Received 13 Votes on 11 Posts
and then does it go thru the grd?loc
No. On 120 it "returns" on the neutral. On 240 it returns on the other leg of the 240.
one not insulated]that must be grd.once in my box
No that is the neutral. The electric company provides you with 24ov, the two insulated wires, and a neutral, the bare wire.

Grounds are used only for safety. They do not normally carry current.
Old 04-05-15, 07:08 AM
Join Date: Mar 2010
Location: USA
Posts: 3,562
Received 21 Votes on 21 Posts
The only way to be sure you have a good ground is to see and test all of the parts of the home electrical system grounding (grounding electrode system consisting of ground rods, your cold water pipe if that is metal going underground, interconnecting wires, etc.) and also see all the parts of the grounding path (equipment grounding conductor) from receptacle down to the panel and connected to the grounding electrode system.

Typically we assume that the grounding is good after it is installed to meet code and upgraded as needed. It is not practical for the homeowner to test how good the grounding system is (relative to the earth or ground*** or dirt or soil) since expensive specialized equipment is needed.

If you want to improve on the grounding for such purposes as ham radio, you can install redundant or additional ground wires. Within limits you can improve on the existing grounding for safety purposes if the latter falls short of code and you don't want to tear open the walls to do a real and proper upgrade.

Installing ground fault circuit interrupters (some are available as duplex receptacle replacements) will give near perfect protection against electrocution even if you do not have a known good ground (or any ground).

The grounding electrode system is properly bonded (electrically connected either directly or via wires or other metal parts) to the neutral terminal strip (neutral bus bar) in the panel. If A is bonded to B and B is bonded to C then A is bonded to C. Therefore bonding the GES to the neutral bus will cause the (usually bare) neutral furnished by the power company to become grounded. Actually the power company neutral was already grounded; it is bonded to ground rods at some if not all utility poles.

*** As in (customer) "This coffee tastes like mud." (Waiter) "Well, it was ground this morning."

Last edited by AllanJ; 04-05-15 at 07:42 AM.
Old 04-05-15, 01:22 PM
Thread Starter
Join Date: Oct 2010
Location: USA
Posts: 58
Received 0 Votes on 0 Posts
thanks for that explanation.loc

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

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title:
Your question will be posted in: