ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Ground Rods: Installation and Hook-Up
by renosteinke - 11/26/22 07:28 PM
Happy Thanksgiving all!
by Bill Addiss - 11/24/22 08:37 AM
Colt Firearms Switchbox
by sabrown - 11/22/22 01:33 PM
Perfect work light?
by gfretwell - 11/22/22 12:48 AM
copper prices where you live and inflation
by gfretwell - 11/21/22 01:52 PM
New in the Gallery:
240/208 to a house
240/208 to a house
by wa2ise, October 9
Now you know.
Now you know.
by Tom_Horne, September 7
Who's Online Now
0 members (), 36 guests, and 52 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#206409 06/29/12 01:39 PM
Joined: Jun 2012
Posts: 1
N
Napo Offline OP
New Member
If you are running a 50mm DB2 underground conduit, for a 2-wire, single phase 600V system (no neutral) between two lighting panels (which have a 600V to 120V transformer) is it mandatory to run a third wire as bonding conductor(to ground)?

The panel themselves have their own grounding electrodes.
The 600V circuits are #2Cu, so in general the code would call for a #6 bonding conductor.

What is the CEC rule/subrule that would make the bonding conductor mandatory? I am not sure I read 10-106 properly.

Joined: Jun 2006
Posts: 613
M
Member
You do have to install a bonding wire with the 600 volt wires so if a fault occurs on the primary side that the upstream breaker can trip. The secondary side has a new ground and bonding jumper to serve the 120 volt side.
There are some cases where you can save on the bonding wire but not this case.
When you feed an out building and create a new service entry the neutral can act as the bonding and as the grounded circuit conductor but because the 2 systems are electrically isolated the 600 volt side needs a bonding wire to return fault current to its source but not for the secondary which works like a new service.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 240
Joined: March 2005
Top Posters(30 Days)
NORCAL 3
Trumpy 3
Popular Topics(Views)
300,233 Are you busy
229,958 Re: Forum
214,779 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5