ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Increasing demand factors in residential
by gfretwell - 03/28/24 12:43 AM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
Cordless Tools: The Obvious Question
by renosteinke - 03/14/24 08:05 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 264 guests, and 17 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#25690 05/16/03 02:22 PM
Joined: Nov 2001
Posts: 75
B
Bill39 Offline OP
Member
OK, for a conversation starter what is your preferred method of taping up larger transformer and motor lead connections? As an apprentice, it seemed like every journeyman I worked with had a slightly different idea. Some used rubber, then plastic tape. Some used an initial layer of plastic tape, then rubber, then a final layer of plastic (the initial layer of plastic was put on sticky side up and was to prevent the rubber tape from adhering to the lugs). Others used varnished cambric, then plastic tape. Others used friction tape somewhere in the mix also.

#25691 05/16/03 03:25 PM
Joined: Oct 2000
Posts: 5,392
S
Member
methods vary per enviroment

my 'bombproof' method....

no-lox
split-bolt
scotch gaurd
dux seal (thin layer)
splicing tape
regular tape
marking tape

bake @ 480V for 45 min
serve hot
[Linked Image]

#25692 05/16/03 04:11 PM
Joined: Mar 2001
Posts: 2,056
R
Member
There are many newer types of mechanical or compression connectors with snap on covers or rubber boots available that split-bolts may be on the road to becoming obsolete.
Time-wise there is no comparison.

#25693 05/16/03 07:41 PM
Joined: Nov 2000
Posts: 2,236
Likes: 1
Member
Varnished Cambrick for mechanical Strength (keeps the sharp parts from poking through) 50% overlap, two layers, one up, one down...

Scotch 130C sticky side out, 50% overlap, two layers, one up, one down stretching tight to prevent voids...

Scotch 33 50% overlap, two layers, one up, one down...


-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI
#25694 05/16/03 07:49 PM
Joined: Apr 2001
Posts: 507
G
Member
Friction, rubber, plastic works fine, lasts a long time!

I avoid spit bolts whenever possible. I'll use lugs when I can.

GJ

#25695 05/16/03 08:32 PM
Joined: May 2002
Posts: 132
E
Member
I agree with "Junkie". Have never had a call back when using this method. Always make sure to wrap tape in direction corresponding with the tightening of a wire nut if used. I would never have thought to have to watch this but have a had a couple apprentices wrap backwards. Of course it was fixed before cover and terminations were completed. Go figure I get a couple of apprentices with those "left handed" tools.

#25696 05/16/03 08:38 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Bolted compression lugs (with a star lockwasher or kep nut) cover 18AWG to 500kcmil. A cambric inner layer allows for splitting open like a clamshell on rework.

#25697 05/18/03 06:10 PM
Joined: Apr 2003
Posts: 48
M
Member
http://www.eis-inc.com/oem/catalog/pdfs/cloth/Moxness.pdf

I use two half laps of moxness and a layer of 88 (scotch)on 480 and below. On higher voltage terminations I use more half laps based on the mil thickness of the tape i had that day. Otherwise I use varnished cambric like Bjarney said. I like the silicone based stuff better it makes a real nice connection.

I also have done a bunch of internal motor connections with varying types of compounds and tapes. (Stator compound and Fuse a flex) if your interested in hearing about them let me know.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5