Catenary Wire - What Height Must it be Installed at?

In this video we use BS7671 On-Site Guide to workout the minimum heights for catenary wires used to support cable above ground level between buildings. Using Appendix D table D2 in the On-Site Guide we can find the minimum distances in areas accessible and inaccessible to vehicles for these catenary wires. The video includes footage of catenary wires supporting cables to help you understand the requirements of BS7671.
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== 🕐 Time Stamps - Cut to the action 🕕 ==
00:00 - Supporting cable on catenary wires
00:18 - Appendix D of the On-Site Guide
00:45 - Catenary wire
00:50 - Bare overhead cables
01:08 - Phone cables
01:45 - Catenary cable built within the phone cables
02:07 - Catenary fixings
02:24 - We don't want it to sag
03:20 Cables supported on a catenary wire
03:30 - Above a road crossing
04:22 - Inaccessible to vehicles
04:55 - Cable supports on catenary's
05:34 - Cables poorly supported on a catenary wire
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[@andysims4906]

Never use plastic table ties to fix the cable to the catenary wire unless it’s a temporary job. In my experience no cable ties last even so called UV resistant type.
I always tape the cable to the catenary wire ,wrap it round 3 times then put a large buckle clip round the cable over the tape. Alternatively use a couple strands or catenary wire and twist it over the tape to secure the whole lot.
Not so much these days but you should still make sure the catenary wire will take extra weight ie snow . It’s surprising how much weight snow is . Also it’s surprising how much cables contract in the cold . I have known other people put them up in the summer and not leaving a slight drop . In the winter the cables pull tight and pull the fixings off the wall or what ever.

[@ryano8768]

Cheers. As per usual it's been an education.

[@GSHElectrical]

Thanks 👍🏻

[@Sam-je4xc]

Great job thanks 🙏

[@GSHElectrical]

Thanks 👍🏻

[@azadsmail8]

Hi
well done nice vid.I wonder to know if there is a shop and small van entering into closed car park still need yo be 5.8m
high? I believe evey situation is different.

[@Nyle95]

An electrician installed power including a consumer unit in my dad's garage, wired into the main consumer unit in the house. I think he used SWA cable and the portion that is run overhead is in metal conduit pipe. Does this follow Regulations and what is the minimum height for this set up? Thanks.

[@pellinimax]

How tall are the caravans! I thought 44 ton lorries where only like 4.2m tall... Very interesting video though as usual

[@Oufg103f]

Very good 👍

[@GSHElectrical]

Thank you very much 👍🏻

[@Bari_Khan_CEng_CMarEng]

The screw device to tension the steel = turn-buckle

[@animarkzero]

For cables outside I've used UV-resistant cable ties and came to the conclusion that even they break down eventually.
Much better and cheaper solution is to use scrap solid copper wire.
Although it does not look as good it is quite long lasting and if the wire is high up in the air you don't see it.
Of course Stainless tie's are the best but not cheap...

[@GSHElectrical]

Thanks for adding your thoughts 👍🏻

[@animarkzero]

@@GSHElectrical Thanks for making awesome videos👌

[@walterskelton411]

2 questions. 1: Is it acceptable to put the electrical wire in a twisting motion along the catenary wire rather than tie it on? 2: Is the armour on SWA acceptable as a catenary support?

[@Fester_]

Good questions. Bing chat says," Steel-wire armoured (SWA) cables must be adequately supported so that they do not suffer damage from their own weight1. As for any cable, cables connected to enclosures should be properly supported to prevent strain on the gland termination1. The connection of SWA cable to enclosures should provide electrical continuity and adequate mechanical strength1."

[@NickToland]

There are Nylon coated cable ties that are great in this situation

[@GSHElectrical]

👍🏻

[@danielteyehuago1633]

Please i want to ask you this question; what's the right order in which you should arrange your circuit breaker in your consumer unit. should it be from the lowest breaker to the highest or highest breaker to the lowest and why... Thanks

[@zippymo672]

The highest one is always closest to the main switch. Then it gradually descends.

[@danielteyehuago1633]

@@zippymo672 thanks for your response.

[@nathanwaistell1185]

I don't believe there is anything saying you have to do that.
I do know that for heat dissapation in the consumer unit, its better to spead out larger amperage MCBs.

[@jollyfinequality9865]

Historically, we use leather cable hangers. I'm fairly sure they were pig skin leather. You can still get them today but i bet most don't use them.

[@GSHElectrical]

Thanks for your comment 👍🏻

[@AdamWatts-fl9ju]

Zip ties get brittle and fall off after 1 year.

[@joseywales3848]

Unless they are UV rated

[@mikerittmanreborn4955]

Werewolf's are real and have been seen in the uk