ELECTRICIANS Q&A - BS7671 TRUNKING FACTORS IET ON SITE GUIDE

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eFIXX

eFIXX

2 роки тому

Trunking factors are often a source of confusion when calculating how many cables you can install within electrical trunking.
Joe Robins explores how the trunking factors within the IET on-site guide are calculated.
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❌ This content on this channel is for electrical professionals.❌ ==================================
📹 Presented by
Joe Robinson - Technical Editor eFIXX
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#efixx #electriciansQ&A #bs7671

КОМЕНТАРІ: 26
@Sparks1Plumbers0
@Sparks1Plumbers0 2 роки тому
This is so timely as I recently watched a video by Residual Current where he had to install new larger tails and the adjacent trunking was rammed and I mean rammed! ... So whilst a nice idea in universe far, far away, in real world scenarios the 45% factor get slung out the window for the 'cram it all in and then some' option. 🤔
@efixx
@efixx 2 роки тому
True it does happen, however the 45% does take account of the gaps formed between round cables.
@guffermeister
@guffermeister 2 роки тому
Several of the UKposts sparks dont take in to account trunking factoring and de-rating as appropriate. When I've raised it, it gets shot down. Much the same with grouping single cores together in a consumer unit with cable ties - in theory that should be de-rated as well....
@efixx
@efixx 2 роки тому
Haven't seen that on UKposts myself but wouldn't be surprised, not many sparks do take account of it, especially when adding to existing trunking.
@MatSmithLondon
@MatSmithLondon 2 роки тому
I installed 100mm steel trunking in my home plant room (walk in cupboard under stairs) and didn’t even know of this requirement! Argh! Thanks.
@efixx
@efixx 2 роки тому
Noice, tidy install for a domestic. 👍
@ericcsonluy8140
@ericcsonluy8140 Рік тому
Do you have a link of the PDF file of the Cable trunking factors table shown on your video? I would like to request a copy for reference in containment sizing. Thank you.
@orielzob2821
@orielzob2821 Рік тому
How would you code an EICR where the trunking is stuffed with cable and the lid just about fits?
@ryanjones7921
@ryanjones7921 2 роки тому
And how many of us have seen trunking so rammed, the lid won’t fit ?
@brianwood5220
@brianwood5220 2 роки тому
Too right, most of what I came across - when I was working, was always stuffed full. And not surprisingly the trunking was quite warm.
@dennisphoenix1
@dennisphoenix1 2 роки тому
There would that many cables in it you had to gingerly twist the buckles on the lid and hoping you haven't caught a cable . Space factor pfft
@raychambers3646
@raychambers3646 2 роки тому
Couple of zip ties sorts the lid out!
@ryanjones7921
@ryanjones7921 2 роки тому
Or some people just leave the the lid on top the control panel
@scottsparky1
@scottsparky1 2 роки тому
It would of been easyer to say no more than half full. That's the rule normally
@gbelectricks
@gbelectricks 2 роки тому
Great video Joe, could we reverse the setup of calculating maximum amounts of cables that can be installed? As for example, twin and earth cable factors are not in the osg, so could we measure the diameter of a te, then use this new information to calculate how many t&e’s would fit inside a given trunking? This could also be applied to double insulated tails in trunking, as double insulated tails are not in osg either 🤷‍♂️
@efixx
@efixx 2 роки тому
That... is a great question, I'll do some research and give it some thought. 👍
@busman2000
@busman2000 2 роки тому
Joe, how do you work out 45% of the inner area?
@efixx
@efixx 2 роки тому
Multiply it by 0.45 is the easiest way. 👍
@Ressy66
@Ressy66 2 роки тому
Hrmmm, I thought cross sectional area is derived from " pi x 50 x 50 / 4 " which would be 1962.5. Or is that calculation only applicable for round material like conduit?
@efixx
@efixx 2 роки тому
Yep, you're correct for a 50mm diameter round cylinder. For a rectangular cross-section it's just base times height.
@Ressy66
@Ressy66 2 роки тому
@@efixx Awesome, thanks for clarifying that
@lucasjones8317
@lucasjones8317 2 роки тому
lid won’t fit zip tie it
@efixx
@efixx 2 роки тому
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