Hello just wondering if anyone could help me! I have to test a circuit tomorrow wired in SWA that is using its armoring as its earth, To carry out the R1+R2 test how would i eliminate any parallel paths? Surely the only real way to do this would be to remove the cable from the side of the metal...
I'm doing a mod for a 3 phase circuit already installed. The only trouble is I can't work out why the existing cables are as they are so i am doubting my sums.
Existing final circuit.
3 pole memshield 2, D32 rated feeding 10mm2 4 core swa with a seperate 16mm2 G/Y as cpc.
Measurements at the DB...
What's the norm on a 3 phase Submain in regards to swa and earthing, I'm looking at 25mm swa but not keen on using the armour as earth, (it works out ok size wise) I normally use an extra core for earth on single phase but 5 core swa seems a bit thin on the ground anyone have fors and againsts...
Hi
Ive got to run in some SWA cables for some large bits of equipment. Its TP&N, is there any issues with using 4 core and using the armour for the earth (ensuring the Zs is ok)?
Hi all
This has got me thinking. I am designing a circuit using 3 core 2.5mm SWA and using table 11 in the OSG on page 182.
With an R1 of 2.5mm and the same for R2 I know what the milli ohms per metre is. That's all well and good but I also know from experience that when uisng the armour as an...
pencilpusher
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armour
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copper
design
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swa
using
value
Hi All,
I recently installed a new dist. board with 95mm sq 4 core swa cable. I used 35mm sq earthing cable even though I should have used roughly half the size of the live conductor. I used this because I had it, and was hoping it will be ok. I now fear that the cross section of the cpc...
gerard
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cable
distribution
distribution board
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gland
Hi all,
Been to look at a job in a chalet. Nice shiny 16mm earth from the CU to an earth terminal, sh**e 4mm oxidized to f*** from the terminal to the armour of the incoming, looped to the 'loop out' SWA going onto the next chalet (sorry, didn't take a photo). Anyway, the site owner has said...
Can anyone point me in the right direction as to find the size of conductor to earth the armour of swa? It's not being used as the cpc on the circuit it's 25mm 3core. I'm always trying to find this when I'm terminating armoured cable!! Thanks
Seen it quite often where the armour of SWA is not earthed, at all, just removed and cores used as live, neutral and earth.
IMHO this is completely wrong for the first installation (what were they thinking??) and should be rectified urgently if found on an EICR ie code C1/2.
What do you guys...
Hi guys , was wondering if any could advise. Got a job when client is moving his shed containing Swin pool pump filter etc etc a few metres. I have disconnected for him and made safe.
Unfortunately though he thought he could just bish bosh in himself but advised that would be a notifiable and...
Spotted a couple of nasties on a solar PV installation yesterday.
1. Single insulated cables (4sqmm twin and earth stripped back) connected to the generation meter (obviously designed to take 25sqmm tails). Yuk!
2. They'd installed an SWA cable from the PV isolator to the isolator at the...
Hiya guys.
I am learning about earthing, bonding and cpc’s at the moment, and I am getting a bit stuck with using the armour of SWA as a CPC. Iwonder if anybody would mind helping me by reading this, and correct what I have got wrong so I can make sure I understand it properly.
If I had a 2...
Hi folks, attempting to fix a screw up by previous installer. TN-C-S domestic property with garage outbuilding. MET is in consumer unit in main house; garage distribution circuit protected by RCBO. Garage sub board populated with MCBs. Cable to garage is 6mm2 SWA 3 core. Garage has extraneous...
When calcualting the minimum csa for a cpc using the adiabatic equation, how can you work out the csa of the armour of an SWA cable in relation to the amount of fault current it can carry?
This has been rattling around in my head for some time, I have read the guide in the sticky section about exporting etc,so a building outside the equipotential zone should not have the earth exported, right ?, and a spike (s) should be used, but, what about the armour this should be terminated...
I have connected the metallic armour of a 1 .5mm SWA cable (about 50ft run) to the met on the main CU using a 10mm earth cable. Is this a bit of an overkill or should I use 6mm earth cable instead?
What calculation applies to determine the cross section of the earth cable in this case?
Cheers!
Hi Guys,
Just wondrerd if you could give me any ideas or where to look , trying to answer an old 2391 test question,
Q. What 5 things would you inspect on s.w.a fastened to cable tray,but it asks spec in regards to the cable and not construction of the tray.
Iappreciate your help
Locket
Hi all i am in the process of doing a pir on a residential home and they have some 3phase sockets wired in 4 core sy flex using the cpc as the neutral and the sy flex " armour" as the cpc. Obviously im going to fail the circuits for using the cpc as the Neutral but just wondering about the...
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