Breaking News
Comments
Oldest First | Newest First | Threaded View
GSKrasle
User Rank
Freelancer
Outer insulation hole detection
GSKrasle   8/21/2014 12:26:14 PM
NO RATINGS
I kike the idea of safety, but exactly how would a hipot test detect holes in the outside insulation of, say, a shielded cable? It seems the cable must be wrapped in foil, or passed through a conductive and compliant 'doughnut' while 'hot' to do this.

zeeglen
User Rank
Blogger
Re: Outer insulation hole detection
zeeglen   8/21/2014 2:08:06 PM
NO RATINGS
@GSKrasle exactly how would a hipot test detect holes in the outside insulation of, say, a shielded cable?

Good point.  Maybe the cable could be coiled up and dunked in a tub of salt water?

Sanjib.A
User Rank
CEO
Cable length under test
Sanjib.A   8/24/2014 10:21:43 PM
NO RATINGS
@Martin: "...The allowable current depends on the application and the cable length..."

I have two questions:

1. Is there any guidance that could be found somewhere which specifies what should be the alloawable current (for AC test voltage there would be some current).

2. What should be  the cable length under test? For example, if an application specifies max length of cable as 30 mtrs., then how to determine what lenght of cable shall be subjected to test?

Jonathan Allen
User Rank
Rookie
Re: Outer insulation hole detection
Jonathan Allen   8/28/2014 7:32:51 PM
NO RATINGS
One way to test for pinholes or cracks in a cable's insulation is to immrse it in water.  Connect your hipot tester high side to the cable's conductor and the low side to an electrode immersed in the water.  We have also used that technique to check the encapsulation of photovoltaic panels.



EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Some Days You're the Pigeon, Others You're the Statue
Max Maxfield
Post a comment
I was watching the travel channel on television the other evening. It was some program about Madrid. The thing I really noticed was the plethora of statues all over the place.

EDN Staff

11 Summer Vacation Spots for Engineers
EDN Staff
20 comments
This collection of places from technology history, museums, and modern marvels is a roadmap for an engineering adventure that will take you around the world. Here are just a few spots ...

Glen Chenier

Engineers Solve Analog/Digital Problem, Invent Creative Expletives
Glen Chenier
15 comments
- An analog engineer and a digital engineer join forces, use their respective skills, and pull a few bunnies out of a hat to troubleshoot a system with which they are completely ...

Larry Desjardin

Engineers Should Study Finance: 5 Reasons Why
Larry Desjardin
46 comments
I'm a big proponent of engineers learning financial basics. Why? Because engineers are making decisions all the time, in multiple ways. Having a good financial understanding guides these ...

Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)