csa

csa

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  1. timhoward

    Main Bonding csa when earthing csa calculated

    Just double checking please - in situations where the main earthing conductor csa is calculated, and in a TNS installation, the 50% bonding conductor csa rule still applies to your final calculated and rounded up earthing conductor size? (As opposed to the tabulated size) I'm doing remedials and...
  2. J

    Equivalent copper csa to an armouring csa

    Hi looking fir a recent table that shows SWA CSA converted to Copper equivalent CSA please for number of conductors and sizes. Lots of articles on this but all the table links i found no longer worked. Thanks john
  3. V

    Sizing csa of old cable

    Hi Looking at an old 3036 board and 2 peak and off peak immersion supplies. The cable looks like it is in between a 1.5 and 2.5. It is fused with a 15 amp fusewire. I know some old cabling is imperial but was this a regular thing for a batch of cable in the 70/80s???
  4. G

    Oven and hob wiring

    Hi all, I have a dedicated cooker circuit on a 6mm cable, 32amp mcb running to cooker switch down to connection plate. I want to install a 1kw ( just under) oven and 6kw hob! Am I ok swapping the connection plate for a dual one and connecting together?? And if so do I run 6mm flex hob to...
  5. h.abrar94

    How to calculate the resistance of steel armour under fault conditions 70 oC for CSA 95mm2

    Hi All, hope your all well. I was hoping if I can please get some advice in regards to SWA. In Particular using SWA as CPC. Cable size 95mm2 I have a table for SWA which shows various information, in the last two columns it shows the "resistance of steel armour under fault conditions at 70...
  6. M

    Just checking my understanding of min c.p.c csa?

    Hello all Just checking my understanding of min cpc sizing. If installing 20Amp 2.5mm TP&N circuit using armouring as c.p.c. Is 2.5mm from bango minimum c.p.c. Table 54.7 seems to suggest so? Cheers
  7. Gavin John Hyde

    Different sized csa cables on same circuit

    Got a house I am working in at moment, customer wants extra sockets downstairs, apart from kitchen the whole ground floor has just 3 double sockets. The current sockets in the lounge/diner are fed by a 6mm twin and earth( from old cooker circuit that was rerouted when a gas cooker went in) and...
  8. FoxySparky

    Csa of cable for Outside shed CCU

    Lads and ladies! Clear up something for me please. The old man has asked me to provide some power for his outside wooden shed, by means of a CCU and breakers for the lighting and power. He will be running various power tools for fixing bits and pieces, and mowing the garden, while also having a...
  9. C

    GN8 9.3.1 Calculation of csa – armoured cable 118

    Ordered GN8 not arrived yet anyone got section 9.3.1 Calculation of csa – armoured cable 118 to hand
  10. sevuk

    Wire gauge/calipers for cable csa

    I've seldom seen these as I mostly do installation work, but does anyone know of any good calipers or gauge for measuring the csa of a cable?
  11. T

    Main Earth CSA TT Encorporated in a cable

    Hello All, Tying my brain in knots trying to work out if this earth is ok: TT system with 100mA RCD on tails Tails then go into an isolator with 60A BS1361 fuse which supplies nearby consumer unit and a remote consumer unit in next room. Remote consumer unit is supplied via twin and earth 10mm...
  12. Strima

    CSA and resistance of 20 & 25mm Steel Conduit

    Can anyone point me in the right direction to find out the CSA and resistance of 20 & 25mm steel conduit? It's for part of my 2396 project where I'm using the conduit as CPC, I'm happy enough with the calculations I just need some numbers to work with. I've tried various manufacturers websites...
  13. Sparky_marky2

    SWA armour supply to outbuilding, what CSA cable? and Reference Method?

    Hi guys, I am running a supply to an outbuilding that requires a 22m run from the Main CU (in the garage) to the CU in the outbuilding, at the Main CU it will be a 40A MCB supplying an 63ma RCD protected sub board which will then supply: 6A type B MCB for 12 downlights and an extractor fan 32A...
  14. charlie76

    CSA Of cables for ELV LED lighting circuit

    I have just purchased a transformer for some under cupboard strip LED's. The unit is CE marked. The ELV side of the transformer has 2 short flexes coming out of it with a CSA of 0.75mm². I was going to just extend these out to the 2 strips of LED lighting I am installing but after reading...
  15. gazdkw82

    CSA main earthing conductor calc

    I'm trying to understand the different ways I can calculate or find the correct size of main earting conductor of an installation. Iv found a formula but it's quite long winded. Is there an quicker process? Here is what I have at the moment after doing some research and practice
  16. W

    How to establish the CSA of multi-strand SWA.

    Hi I'm new here and hope that someone can advise on a project I am currently working on. I intend to supply power to a garden building directly from a spare MCB in the consumer unit in the house, which equates to a total distance of approximately 30m, although the route that the cabling is...
  17. J

    csa of wylex rcd live and neutral link cables

    Due to a burnt out 80a rcd on a wylex split board consumer unit, the consumer unit now only has one 80a rcd which all circuits (mcbs) are wired to, so a new 80a rcd has been bought to reinstate the split board. The issue is that the original live and neutral cables that linked the mcbs together...
  18. J

    Tns main protective bonding conductor csa

    Hi just checking the main protective bonding conductor size on a tns system, there are two supplys the tails sizes are both (630x2 the supply earth is 240 and neutral is 630x1) persupply designer aspecified main erthing conductorto met fothe main protective bonding as 2 x 240 i think this i...
  19. zap

    Identifying csa of t&e

    Greetings. I tested an rfc and recorded the following results: r1 = 0.62 rN = 0.89 r2 = 1.45 The difference in r1 and rN indicate loose connections so I checked all the sockets (bar one) on the ring which revealed two loose connections. The rfc now tests as follows: r1 = 0.58 rN = 0.59 r2 = 1.45...
  20. F

    TT system main bonding CSA?

    Rewiring an older TT terraced property. There is currently 6mm earthing from the rod, and also as main bonding to gas and water. I (was!) confident that 6mm main bonding met the requirements of BS7671, but a fellow Part P installer insists that I need to upgrade the main bonding to 10mm, but...

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