ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Material shortages???
by HotLine1 - 05/23/22 01:56 PM
It's been an interesting career
by Marienauripod - 05/23/22 12:21 AM
Run Cap subsitution question. Two vs. one
by LarryC - 05/20/22 09:01 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 (), 37 guests, and 13 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2004
Posts: 786
L
LarryC Offline OP
Member
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.

Joined: Oct 2000
Posts: 2,722
Broom Pusher and
Member
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!

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *

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

 

Member Spotlight
cookcc
cookcc
California ,Long Beach
Posts: 28
Joined: May 2007
Top Posters(30 Days)
LarryC 3
NORCAL 2
Popular Topics(Views)
291,341 Are you busy
223,834 Re: Forum
209,232 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5