ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
sparky 5
Recent Posts
Holiday Wishes to all!!
by HotLine1. 12/15/17 07:20 PM
Dimmable LED 2x4 lay in fixtures
by HotLine1. 12/15/17 07:15 PM
2017 NEC Changes
by HotLine1. 12/15/17 07:06 PM
Casino Wiring methods
by HotLine1. 12/09/17 10:44 AM
Ground wire Size to water Line.
by HotLine1. 12/05/17 12:11 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
243,081 Are you busy
179,524 Re: Forum
170,437 Need opinion
Who's Online Now
0 registered members (), 11 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#206409 - 06/29/12 01:39 PM 600V single phase 2-wire  
Napo  Offline
New Member
Joined: Jun 2012
Posts: 1
Alberta
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:

#206410 - 06/29/12 02:07 PM Re: 600V single phase 2-wire [Re: Napo]  
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
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.



Member Spotlight
Samurai
Samurai
Fl.
Posts: 46
Joined: May 2007
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.008s Queries: 15 (0.001s) Memory: 0.7442 MB (Peak: 0.8598 MB) Zlib enabled. Server Time: 2017-12-17 06:02:56 UTC