ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
Old decora style outlets
by Admin. 03/25/17 11:40 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
fuse rejectors
by HotLine1. 03/24/17 07:53 AM
Another Forum Update
by Admin. 03/22/17 03:04 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,603 Are you busy
166,433 Re: Forum
160,706 Need opinion
Who's Online Now
0 registered members (), 73 guests, and 12 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#82297 - 11/01/02 03:46 PM High Voltage Grounding in duct banks  
yooper  Offline
Junior Member
Joined: Aug 2002
Posts: 8
12470 -7200 system grounded, Switchgear belongs to the owner,out of switch gear 3 - 12470 circuits. thur a duct bank and manhole system. when system was installed over 30yrs ago they ran 12470 circuits in the conduits,with no grounds, BUT they ran two 500 mcm insulated (600 volts) in the concrete of each ductbank from manhole to manhole and tied these to a ground bar and ground rod in each manhole.Shields are then tied to theses gr bars where cable t:s off to a bldg. Ciruits are fused at 400 amps each.(CODE QUESTION)By reading the 2002 NEC and the 2002 ieee The grounds in the concrete
are adquate equipment grounds , If under 600 volts grounds in most cases would be required in each PVC conduit.If the conduits were Metal the Ground wires would be required to be in each conduit.Don;t tell me an eng, shold answer this as I have talked to Several Electrical eng,s and they all agree its not spelled out clearly in the nec or ieee.

2017 / 2014 NEC & Related Books and Study Guides

#82298 - 11/01/02 04:48 PM Re: High Voltage Grounding in duct banks  
resqcapt19  Offline
Joined: Nov 2000
Posts: 2,148
Where did you find an exception for over 600 volts for the rule in 300.5(I)?


Member Spotlight
Attic Rat
Attic Rat
Bergen Co.,N.J. USA
Posts: 524
Joined: December 2003
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.009s Queries: 14 (0.002s) Memory: 0.7417 MB (Peak: 0.8567 MB) Zlib enabled. Server Time: 2017-03-28 04:22:50 UTC