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Topic Title: H07 CABLES WITHIN TRUNKING
Topic Summary: Types of singles within trunking satisfactory
Created On: 26 September 2017 10:54 AM
Status: Read Only
Linear : Threading : Single : Branch
 H07 CABLES WITHIN TRUNKING   - BILLYBOY65 - 26 September 2017 10:54 AM  
 H07 CABLES WITHIN TRUNKING   - AJJewsbury - 26 September 2017 03:48 PM  
 H07 CABLES WITHIN TRUNKING   - BILLYBOY65 - 26 September 2017 04:03 PM  
 H07 CABLES WITHIN TRUNKING   - OMS - 26 September 2017 04:29 PM  
 H07 CABLES WITHIN TRUNKING   - AJJewsbury - 26 September 2017 07:21 PM  
 H07 CABLES WITHIN TRUNKING   - dp11 - 26 September 2017 08:26 PM  
 H07 CABLES WITHIN TRUNKING   - BILLYBOY65 - 28 September 2017 03:03 PM  
 H07 CABLES WITHIN TRUNKING   - paulskyrme - 28 September 2017 05:43 PM  
 H07 CABLES WITHIN TRUNKING   - John Peckham - 28 September 2017 06:54 PM  
 H07 CABLES WITHIN TRUNKING   - AJJewsbury - 28 September 2017 07:50 PM  
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 26 September 2017 10:54 AM
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BILLYBOY65

Posts: 88
Joined: 11 May 2011

Hi

Just wondered if anyone has information on singles within trunking, we are installing some interlinks between switchboards, UPS panels etc in a commercial environment.

We would like to know if the two cables below would be suitable, they both have the correct voltage rating and are BS marked,

1. BS6195 COIL END LEAD CABLES
2. TRIFLEX H07RN-F CABLES

has anyone comments on either of these as mains 415v cables laid in steel trunking interlinking panels, just an alternative to BS6491B ?
 26 September 2017 03:48 PM
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AJJewsbury

Posts: 16113
Joined: 13 August 2003

I can't see a problem.
- Andy.
 26 September 2017 04:03 PM
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BILLYBOY65

Posts: 88
Joined: 11 May 2011

Thanks Andy, seem easier to work with than standard singles. An obvious favorite for wiring within panels.

Billy
 26 September 2017 04:29 PM
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OMS

Posts: 22435
Joined: 23 March 2004

Have you priced them yet ?

Keep in mind that both types are fine wire - so you need to be mindful of the terminations as well

Regards

OMS

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Let the wind blow you, across a big floor.
 26 September 2017 07:21 PM
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AJJewsbury

Posts: 16113
Joined: 13 August 2003

if they're cage clamp terminals, the fine wire will probably make a far better connection than the traditional 7-strand stuff.

- Andy.
 26 September 2017 08:26 PM
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dp11

Posts: 97
Joined: 18 June 2011

The original cable is low smoke if that makes a difference. You might need to talk to who ever specified BS6491B
 28 September 2017 03:03 PM
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BILLYBOY65

Posts: 88
Joined: 11 May 2011

Great Thanks, there is a price difference between standard singles and the H07, not massive though.

Now trying to get cable current rating bottomed out, does anyone know a definitive cable rating table of these cables, (other than BS7671)
 28 September 2017 05:43 PM
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paulskyrme

Posts: 1291
Joined: 12 February 2003

You can check OEM data, and derate according to the installation method, or use the BS7671 ratings and de-rate for the installation method and the class 5 stranded conductor I would think.
 28 September 2017 06:54 PM
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John Peckham

Posts: 8793
Joined: 23 April 2005

Andy J

Not sure terminating bare tri-rated conductors in a cage clamp is that good. I would go for a bootlace feral to comply with 526.9.1.

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John Peckham

http://www.astutetechnicalservices.co.uk/
 28 September 2017 07:50 PM
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AJJewsbury

Posts: 16113
Joined: 13 August 2003

Andy J

Not sure terminating bare tri-rated conductors in a cage clamp is that good. I would go for a bootlace feral to comply with 526.9.1.

Maybe it depends on the relative size of the conductor and terminal. Once I tried getting 16mm2 tri-rated with ferrules into RCBO/MCB terminals supposedly designed for 16mm2 just to find they wouldn't fit - in almost desperation I tried without the ferrule and was astonished at how well it worked - the clamp contained all the strands (which re-arranged themselves to the shape of the terminal, like they do in a crimp) and held the lot very firmly indeed - despite much wiggling. Same results with 25mm2 tri-rated into a switch disconnector. (I'd claim the 'suitable terminals' option!)

The big advantage seems to be that the strands re-arrange themselves so that terminal is completely filled as it's screwed up - so there's no space for any movement - unlike with 7-strand which inevitably leaves some sizeable air gaps (especially if the strands are twisted).

I could see though that trying say a 1.5mm2 multistranded into a terminal designed for 35mm2 or 50mm2 probably wouldn't be as successful and in cases like that a ferrule could give much better bite to the connection. Where to draw the line in between? I'm not sure - maybe someone could do experiments....?

- Andy.
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