ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Burning out of return(white) side of 120volt rec
by crselectric. 06/14/19 02:15 AM
Video door bell causing chime activation of coil
by JoeTestingEngr. 06/13/19 12:43 PM
Troubleshooting Voltage Drop Across Relay
by gfretwell. 06/09/19 11:49 AM
Apple Recalls Three-Prong Wall Plug Adapters
by Admin. 06/05/19 09:06 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 8 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Bonding temporary modular equipment installations #212283
12/28/13 03:13 PM
12/28/13 03:13 PM
L
LarryC  Offline OP
Member
Joined: Jul 2004
Posts: 783
Winchester, NH, US
Building industrial equipment that is installed outside. These systems are modular in nature and can be or will be moved from one location to another.
General set up is a central power entry module, that then feeds one to six sub systems. Power for each subsystem is plugged in via a suitable cord and weather tight connector.
Total system power is between 10 and 50 KVA at 3 phase 240 depending on system configuration.

Bonding will probably be separate suitably sized conductor(s) tying all of the structures together.

My question is: What would be a suitable method of testing the bonding to verify everything has a nice low impedance path back to the PE terminal?

I believe I need approximately 200 A AC or DC for 1 minute to perform this verification test.

My thoughts are a constant current power supply like a stick arc welder or perhaps a 1 KW 12/24 buck/boost transformer and a large variac.

Work Gear for Electricians and the Trades
Re: Bonding temporary modular equipment installations [Re: LarryC] #212286
12/28/13 11:53 PM
12/28/13 11:53 PM
Scott35  Offline
Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,720
Anaheim, CA. USA
Larry,

One test may be done using an array of Fixed Resistance Heater Elements connected to the far end of each Circuit, then measure the Voltage at each end to determine the Voltage Loss.
Apply the Volt Drop (E-loss) against the drawn Amperes (I) to achieve the Conductor Impedance (Z).

--Scott (EE)


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

Featured:

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

 

Member Spotlight
Trumpy
Trumpy
SI,New Zealand
Posts: 8,260
Joined: July 2002
Show All Member Profiles 
Top Posters(30 Days)
Khombo 2
Popular Topics(Views)
255,704 Are you busy
191,678 Re: Forum
181,463 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 15 (0.003s) Memory: 0.9445 MB (Peak: 1.0611 MB) Zlib enabled. Server Time: 2019-06-17 07:07:49 UTC