The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
Trumpy 8
sparkyinak 7
Who's Online
1 registered (sparkyinak), 220 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#163326 - 05/06/07 12:34 PM Dielectric strength of shrink tube?
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I am sure we have all used and perhaps misused shrink tube.
Does anyone know if this has really been evaluated and what is it really appropriate for?
I am guessing class 2 low voltage but I am not really sure.
_________________________
Greg Fretwell

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#163328 - 05/06/07 01:14 PM Re: Dielectric strength of shrink tube? [Re: gfretwell]
Elviscat Offline
Member

Registered: 08/13/05
Posts: 214
Loc: Seattle Washington USA
It looks like at least some is rated at 600V. Click Here for more info

Top
#163334 - 05/06/07 03:42 PM Re: Dielectric strength of shrink tube? [Re: Elviscat]
JoeTestingEngr Offline
Member

Registered: 11/04/05
Posts: 786
Loc: Chicago, Il.
I'm sure that this is something that we have both used a ton of in our electronics related lives. Even good quality heat shrink can be applied badly. Plus, we can only guess which brand someone else has used. I just bought 4' lengths of 3/64", 1/16", 3/32", and 1/8" in my last MPJA order. The paper label on each length tells me it is "PermaSleeve" polyolefin and is UL & CSA certified @ 600V @ 125 C. But there isn't a single marking anywhere along it's length to clue you in. I often use it in conjunction with clear teflon tubing which I believe has superior dielectric properties.

As an aside, I was recently asked to order some more of the yellow silicone jacketed cable that was used for signal analysis long before I showed up. Imagine my thoughts when I learned that the 1000V rated silicone jacket surrounded a 300V rated pair. OOPS!!!
Joe

Top
#163344 - 05/06/07 08:07 PM Re: Dielectric strength of shrink tube? [Re: JoeTestingEngr]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
I have probably used a mile or two of shrink. Some has come in engineered "bills of material" in carefully wrapped "kits" and other was ordered from "Hos/digi/all/new/Jam" or "Bob's" electronics. None of them had a listing mark.
I do understand you never shrink a "wild hair" or pointy solder joint but I still wonder what a clean joint shrinked 30-40% is worth. Bear in mind the thickness of the finished insulation depends on the anount of tube you started with. A "close fit" is probably not a good thing.
_________________________
Greg Fretwell

Top
#163513 - 05/09/07 08:19 AM Re: Dielectric strength of shrink tube? [Re: gfretwell]
XtheEdgeX Offline
Member

Registered: 04/17/05
Posts: 127
Loc: Florida
Some types of heat shrink are rated up to 35kv.

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals