Crimping cables

[fattony]

I had some of my work condemed today I did a crimp join inside a metal 2 x 2 trunking on FP200

Your comments please

 

[Spark123]

What grounds were they condemned?
What else is in the trunking? What is the FP200 supplying?
Were the crimps detrimental to the fire resistant properties of the cable?

 

[fattony]

The Cable was (past tense) supplying a switched fused spur, its a mains galvonised trunking with loads of space.

I have no idea why it was condemed, I have not heard anything from the man who condemed it, I was just reading 526-02-01 and 526-03-01 all about electrical connections.

I really do not have a clue

 

[Belle427]

had the same thing in a hospital last year,through crimps installed in dado plastic trunking by previous sparks,inspector saw them and made us pull in new circuits

 

[fattony]

why though, this is metal trunking with through crimps, I spoke to a friend who's in the NIC and he coldn't see anything wrong with it and said neither would his inspector

 

[Belle427]

i suppose its a point that is liable to fail if not crimped securely,and a real bitch to fault find on

 

[fattony]

but a pre tensioned crimp does not come lose, does it?

 

[The Jeep]

Are they just regular crimps? I have recently used some 'heat-shrink butt crimps' and they're brilliant: very strong mechanically and sound electrically. They look professional, too, more so than just plain crimps.

 

[Lectrician]

i hate seeing through crimps in trunking - the trunking is not a place to make joins, it is a containment system. Through crimps are a little odd, as they 'sort of become part of the cable' rather than a join.

I hate opening trunk to install some other ccts, and have to lift or move cables out of the way that have through crimps on them. You never know for sure that they are well crimped, and very often the insulation pulls back a little from the butt, exposing a little conductor. The ends of the butts often stay oversized around core aswell, leaving the internal of the butt exposed. Dangerous in trunk.

The heat-shrink type would be far better - but better still is not to do it in the first place.

Why did you crimp? Didn't measure very well, or for some other reason?

 

[fattony]

Couldn't get the drill underneath the trunking to drill a 20mm hole and to use an existing hole would mean bending the cable which will kink the cable quite badly so I chose to crimp inside the trunking

 

[Lectrician]

Not sure I understand - couldn't you have stripped the insulation off for the distance in te trunk?

 

[Pensdown]

I don't allow our guys to use crimp joints in trunking. If they have to make a joint then it's done by installing a beezer box on the side.