ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Ground Rods: Installation and Hook-Up
by renosteinke - 11/26/22 07:28 PM
Happy Thanksgiving all!
by Bill Addiss - 11/24/22 08:37 AM
Colt Firearms Switchbox
by sabrown - 11/22/22 01:33 PM
Perfect work light?
by gfretwell - 11/22/22 12:48 AM
copper prices where you live and inflation
by gfretwell - 11/21/22 01:52 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 (), 18 guests, and 47 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jun 2002
Posts: 159
L
Member
Have any of you guys used an ac insulation resistance tester?


regards

lyle dunn
Joined: Jul 2002
Posts: 8,426
Likes: 3
Member
Yes lyle,
I use one every once in a while here.
I take it that you are talking about a Hi-Pot test (or Dielectric Withstand Test), as opposed to the plain-vanilla DC Insulation Resistance test?.

Joined: Jun 2002
Posts: 159
L
Member
Yes Trumpy, thanks for the reply.
I know that they are required for dielectric testing of certain products and electrical systems. An output of 3750vac even though current limited is not appropriate in the wrong hands.
What I wanted to know was if these instruments had a place in the field rather than in the production line lab.


regards

lyle dunn
Joined: Jul 2004
Posts: 145
C
Member
Way back in the last century, (ok 12 years ago) I had to use such a beast as part of the portable appliance testing regime where I worked. Output as you say, up to 3750 volts AC, current limited to 5/10/15 mA, selected by a switch, with a deeply recessed "operate" button so it couldn't be energized accidentally. I agree they should only be used by competent persons trained in the dangers of high voltage.
With a probe carrying that kind of voltage, you could do a lot of damage to some kinds of electronic devices. But it helped pick up deteriorating insulation on double insulated tools and appliances, so yes, I believe they do have a place in the field, just a very narrowly defined one.

Joined: Jul 2002
Posts: 8,426
Likes: 3
Member
Lyle,
We have a 20kV model here at the PoCo, it's used for flash testing HV cables, transformers and switch-gear, as well as the odd suspect bushing insulator.
I agree fully with yourself and Chipmunk, 3.75kV is not the sort of cat you want to let out of the bag, these voltages are lethal with the most minute of current levels. [Linked Image]


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

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

 

Member Spotlight
JoeKP
JoeKP
Berkley, MA
Posts: 144
Joined: March 2008
Top Posters(30 Days)
NORCAL 3
Trumpy 3
Popular Topics(Views)
300,203 Are you busy
229,934 Re: Forum
214,773 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5