Mains cables
Printed From: Graham Slee Hifi System Components
Category: DIY AUDIO
Forum Name: DIY Audio questions and answers
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Topic: Mains cables
Posted By: bass man
Subject: Mains cables
Date Posted: 15 Apr 2021 at 6:12pm
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I have just purchased some lapp olflex mains cable to make a 6 gang extension which is going to be hard wired into a consumer unit The cable is shielded with a tin/copper braid Should it be grounded at both ends ?? ------------- paul am from Yorkshire tha nuz |
Replies:
Posted By: lfc jon
Date Posted: 16 Apr 2021 at 4:10pm
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I would say so ------------- Reflex M, Solo (both with PSU-1) CuSat50, Lautus, Spatia & Spatia links cables. Ortofon Bronze. |
Posted By: Ernie
Date Posted: 16 Apr 2021 at 11:17pm
I would say talk to an electrician. SY and CY cables are not covered by BS7671 aka the 18th Edition. Irrespective of any benefits that may or may not be achieved by screening a supply cable it reads like you’re going to make a “flying lead” direct from your consumer unit. Again not recognised under BS7671. Careful you don’t invalidate your house and contents insurance like the berks who remove or bypass plug top fuses. To the question of screening its supply end only. If you’re hoping to attenuate high frequency noise by screening a power cable you’ll be disappointed. Low impedance ground plane bonding between the components is the key to that. If you can hear a difference knock yourself out, I’m not getting into an argument about mains cables. Get a 6mm twin and earth and terminate it at a wall mounted socket is my advice (as a qualified electrician). ------------- There are 10 kinds of people. Those who understand binary and those who don't. |
bass man wrote:Posted By: bass man
Date Posted: 17 Apr 2021 at 10:13am
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Thanks for the advice ernie I have a seperate consumer unit in my log cabin with 3 rcd im using one for lighting and 1 for sockets so the spare will just be for audio What size breaker would you recommend Cheers ------------- paul am from Yorkshire tha nuz |
Posted By: Ernie
Date Posted: 17 Apr 2021 at 11:39am
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It’s a radial circuit so 15A. What size is the Olflex cable? What size is the supply cable and earth to the cabin and how far away from the house consumer unit is it, i.e. how long is the cable run from consumer unit to your cabin? Also is it a steel wire armoured and is it 3core, live, neutral and earth or are you using the armour as the earth connection? What Olflex have you got? SY (clear jacket with silver braid) or CY (grey outer jacket copper braid)? Seriously though screened cable is for industrial applications where enough separation between between dirty (frequency drives and inductive load switching) supplies and clean (supplies from fuse boards) cannot be achieved. It goes between the frequency drive and the inductive load to help stop RF affecting neighbouring cables. SY isn’t screen btw it just affords light mechanical protection. ------------- There are 10 kinds of people. Those who understand binary and those who don't. |
Posted By: bass man
Date Posted: 17 Apr 2021 at 8:57pm
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Yes used armoured cable about 10m in length The lapp cable has 2.5mm conductors its the cy I haven't grounded armour as its buried under my lawn I will only be using about 0.5m of the lapp cable to the block ------------- paul am from Yorkshire tha nuz |
Posted By: Graham Slee
Date Posted: 18 Apr 2021 at 10:54am
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The way I would have made off a SWA (before I became unqualified) ------------- That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps |