ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Questioning the electrical norms
by HotLine1 - 03/04/21 12:35 PM
Lock-down Thread
by gfretwell - 03/03/21 12:38 PM
Northern Tool Recalls Powerhorse Generators
by Admin - 02/25/21 09:49 PM
You will never guess
by gfretwell - 02/25/21 07:48 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 14 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
600V single phase 2-wire #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.

Tools for Electricians:
Re: 600V single phase 2-wire [Re: Napo] #206410 06/29/12 02:07 PM
Joined: Jun 2006
Posts: 613
M
mikesh Offline
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.


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

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

 

Member Spotlight
Grover
Grover
Sebago, ME, USA
Posts: 109
Joined: January 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
275,641 Are you busy
209,564 Re: Forum
196,916 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3