ELECTRICIANS Q&A: CABLE TRAY GROUPING FACTOR CALCULATIONS

Рет қаралды 12,092

2 жыл бұрын

Do you need to include all cables fixed to a cable tray when calculating grouping factors.
In this electricians Q&A, Joe Robinson takes a deep dive into thermals related to grouped cables when designing and installing cable tray.
== AD ===========================
More from Atkore
www.efixx.co.uk/atkore
================================
📍SUBSCRIBE TO THE CHANNEL eFIXX helps electricians, electrical contractors, building services engineers, and electrical apprentices. Watching our videos, you'll discover new products, explore new applications and find answers to your technical questions. So if you've been on the tools for years or just starting your electrical journey, we'll help you stay up to date with the latest regulations and developments in the electrical industry.
hub.efixx.co.uk/youtube-subscr...
================================
📺 NEW TO THE EFIXX CHANNEL Watch our essential videos playlist hub.efixx.co.uk/essentials
📺 CATCH UP ON THE LATEST VIDEOS
hub.efixx.co.uk/latest
📺 ELECTRICIANS' TOOL REVIEW
hub.efixx.co.uk/tools
================================
🔴 eFIXX LIVE Join us for our youtube live stream twice a month - features product sneak peeks, challenges, giveaways and live electrical banter.
NEXT STREAM HERE
👉hub.efixx.co.uk/next-live-stream
Catch up on previous episodes
👉hub.efixx.co.uk/livestream
================================
🆕 FREE CPD Learn about new applications, regulations and best practice with our FREE CPD modules. - New modules released every month covering everything from surge protection to lighting hub.efixx.co.uk/CPD
================================
📝 APPRENTICE HUB If you're an electrical apprentice, retraining as an electrician or looking to refresh your knowledge, then please check out our apprentice hub. It contains thousands of multiple-choice questions to help prepare for electrical installation exams. hub.efixx.co.uk/apprentice
================================
📩 eFIXX NEWSLETTER Sign up to find out about our live events, competitions and product giveaways.
www.efixx.co.uk/sign-up
================================
FOLLOW US on your favourite social networks for behind the scenes action, breaking news and competitions.
🟠 INSTAGRAM hub.efixx.co.uk/Instagram
🔵 LINKEDIN hub.efixx.co.uk/linkedin
🟣 FACEBOOK hub.efixx.co.uk/facebook
🟡TWITTER hub.efixx.co.uk/twitter
==================================
❌ This content on this channel is for electrical professionals.❌ ==================================
📹 Presented by
Joe Robinson - Technical Editor eFIXX
===================================
#efixx #electriciansQ&A

Пікірлер: 44

@thattoolguy9432 2 жыл бұрын

missed a cable tie 3rd row up far right 1:06 had to be done before some else got in haha, great video as always Joe

@efixx 2 жыл бұрын

Ha! Good spot. There was a fixing screw in the way in fairness.

@thattoolguy9432 2 жыл бұрын

@@efixx i spotted the gutter bolt but couldn't resist :) .. i think who ever done it deserves an eFIXX i got it wrong sticker on the next live feed hahahaha

@MrKeefy 2 жыл бұрын

A company I worked (long since gone bust) for when I was an apprentice got this wrong. It was a fairly small plant room with 3 phase motors, rotork actuators and other control and instrument equipments plus lighting etc. The main tray was 300mm wide and stacked full. I heard in theory at college cables get warm in groups etc but this was the first time I experienced it I was quite surprised how warm they all were. Me and a labourer were the ones tasked with replacing the 300 tray with 600 all while the stuff was powered on.

@efixx 2 жыл бұрын

Thanks for sharing your experience, turns the theory into practical. 👍

@sandymcnair5298 2 жыл бұрын

Not forgetting spare capacity, as we are designing for the future installation also. I would always size at the maximum grouping likely to be experienced on the containment and/or DB. With all the caveats on the British Standard its hardly worth trying to wiggle your way around the minefield, especially if the cable size you get in the end is reasonable (such as required for voltdrop). On occasions where a larger than reasonable cable is calculated look at it in detail to see if it can be engineered down.

@marionlyons7292 2 жыл бұрын

Great video

@efixx 2 жыл бұрын

Thank you. 😊

@Dog-whisperer7494 2 жыл бұрын

Fantastic video low as always 👍👍👍❤️⚡️

@efixx 2 жыл бұрын

Thanks Sean.

@Dog-whisperer7494 2 жыл бұрын

@@efixx saw a shop today with the eFix logo black on white back ground, I think it was a print shop or something , it in Southend . Maybe a copy right issue there . Can you call me please I emailed you my number last week

@ja_adam_ 10 ай бұрын

@@efixx say there is a large installation with 20 circuits in trunking leaving the DB. That would mean a grouping factor is 0.38… this would make every cable need to be very large, nevermind if other factors were applicable ? Is this right, anyway around this?

@j.l1848 Жыл бұрын

Interested to know grouping factor is necessary for DC cable for UPS which will only discharge max 7 minutes at a time?

@h8ryj 2 жыл бұрын

Interesting. I've worked in London underground tunnels where HV cables are mounted to trays and or a rack system. Almost every time they're grouped together with zero distancing between them

@efixx 2 жыл бұрын

Much lower current on the HV

@alistair1978utube 2 жыл бұрын

Curious to know where HV cables are used in LU tunnels?

@Joe-nf5ow 2 жыл бұрын

hi , nice video and explanation. i learn so much from your videos. please make the explanation about the unequally loaded and not same size conductor grouping factor, thank you

@vinsenchin4552 8 ай бұрын

Hi, where can i watch the second episode regarding non equally loaded wiring int trunking. Thanks

@abhimbz007 Жыл бұрын

From where you got thar table for grouping factor? IEC or NEC ?

@smithboyv1 11 ай бұрын

Does table 4c1 also apply to T&E cables?

@kamotipstv6980 9 ай бұрын

Sir you just save my butt from getting fired

@edglue6138 2 жыл бұрын

I've usually left the job. 5 years before the grouping factor comes into account 🙄

@edwardgadsby8327 2 жыл бұрын

Can you do a video on how a realistic maximum demand is calculated for EV installs specifically.

@efixx 2 жыл бұрын

Yes - more on EV coming very soon!

@arcadia1701e 2 жыл бұрын

Would this even apply to a tray like the one behind you. ? Isn't there a section of the grouping that states , if the cables are more than their diameter apart they aren't classed as being grouped ?

@efixx 2 жыл бұрын

More than twice the diameter apart if memory serves. 👍

@arcadia1701e 2 жыл бұрын

@@efixx ahh yes . Just looked it up. You are correct. Cables spaced 2 times their diameter apart are classed as not grouped.

@efixx 2 жыл бұрын

Nice, good to know the old brain's still ticking over!

@edglue6138 2 жыл бұрын

Just Done my covid 19th edition.

@alunroberts1439 2 жыл бұрын

Table calculations did change as the oven and the hob changed we calculated for 4.74kw but then she one decided to buy a 6.5kw hob. We had a total of 8kw on full load. But we did have 6mm total length was under 14M so did calculate for 15M All Well with in using mV drop from the big book of you must follow or else.

@abdullahalazemi738 Жыл бұрын

If 35C Temperature Factor (0.94) And Load 4A Lighting 2# circuit (0.8) MCB 10A --- It= 10/(0.94x0.8)=13.3A I need 1.5 Wire The wire can carry 17.4A ------ Question: What will be the answer 1- 0.3(0.8)(17.5)(0.94) Or 2- 0.3(0.8)(17.5) Or 3- 0.3(0.8)(13.3) Thank you

@gtsource5826 2 жыл бұрын

I am one of your followers from Algeria Thank you for the valuable information that you provide for free I appreciate your effort to provide the content but sir If you translate into Arabic, you will gain more followers just an opinion

@efixx 2 жыл бұрын

Massive thanks for the support 👍🏻