calcs

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  1. dlt27

    3 Phase supply calcs.

    Hi and thanks in advance, I have been asked to provide a new supply for a factory unit. They want supplies to welding bays, metal cutting saws etc. The only info I have been given is that they want a 250A(3 phase) supply from existing 600A panel (PME) to a sub...
  2. S

    Chiller Feed Calcs

    Hi All I Have a chiller to feed power to and i'm having a play with the calcs prior to the designer. The cable run is 60m directly clipped I'm arriving @ 16mm CSA cable but i'm cncerned about the max start up. Also thinking 50A C type or maybe 63A C type - but it mentions REC 80A...
  3. Michaelwgroves

    Cable Calcs

    Help I'm going stir crazy, I can't find cable Calcs for 16mm armoured cable reference method B. 2 cables. Page 362 covers reference method C-E but where did A and B go?
  4. Soulsurfer

    Instantaneous water heater calcs

    Hi all, been a while since working out calcs for size of a TP Mcb and cable for something like this and am a bit tired and ill so thought I'd take some stick and ask ! Item is a Zip DBX 27 and 3 phase at 27kW, supplied by a 3 core Swa is what client has asked for and seperate Earth alongside...
  5. C

    cable calcs

    Need advice, I'm doing design calcs for ring final circuits for the 2396 course. the question is when calculating the cable length for a ring circuit is it the total length of the circuit ie cu back to cu or to the furthest point on the ring or the mid point! thanks in advice
  6. L

    Calcs Check

    New to the designing part and want to make sure im correct. Got a 10 t+e that i want to feed a garage submain. I have wired it to an adaptable box which im going to joint with armoured. The armoured will run about 2 meters in a duct buried in the ground to a depth of 0.8m. There is no bunching...
  7. driverman

    Volt drop calcs on ring main

    Hi Guys, I'm not into design etc and never have been really but how do you calculate volt drop on a distribution ring main circuit? Ring circuit say covering a large area supplying various loads/buildings. I was thinking split the ring and work it out as 2 x radial circuits, but 1 radial may...
  8. M

    Cable calcs

    Good Evening Gentlemen, Please bare with me as I have looked at previous posts and some people have asked similar quistions and got slated for it... I am wiring an office, it's on the fourth floor of a multi story building! I need to run two supply's to comms cabinets inthe basement...
  9. J

    3 phase supply

    I need to get a 3 phase 400v supply over to a unit with around 32amp per phase. The total length of the run is 108 meter fro source to consumer unit. From the consumer unit there is already an existing 4 core 35mm SWA cable running 50 meters And from the supply side there is a 4 core 20mm SWA...
  10. R

    diversity calcs for double oven and hob

    Hello all, I have been to a job where they have an exsisting zanussi zdf 5-5.5kw double oven and a gas hob. The customer wants to replace the hob with a hotpoint cra641dc 6.6kw ceramic hob. The current supply is 6mm t/e on 32a mcb rcd protected. They do not want a new supply put in for hob so...
  11. ray-bentos

    Can Someone Check My Diversity Calcs Please?

    Can someone please just check over my working & diversity calcs for the following CU change: Supply is 100amp TNC-S with 25mm tails, 16mm Main earth & 10mm bonding so all good there. Working from OSG Table A2: Working off number 9 (Standard arrangement of circuits in accordance with Appendix H)...
  12. K

    Cable for sub board

    Hi i have a job with a 40 metre run of swa 4 core via tray work its going to feed a 12 way 3 phase board from a 63amp mcb ive calculated that a 16mm would be sufficant would i be right thinking that?????
    • keiren
    • Thread
    • board cable calcs earth going
    • Replies: 20
    • Forum: UK Electrical Forum
  13. M

    roof survey & wind calcs

    hi many thanks to guys who recommended BMG roof surveys, filled out forms sunday with photos emailed over sunday afternoon all calcs back today. one day turn around very happy.
  14. M

    mixed 1.5 and 2.5 mm lighting - volt drop calcs

    ok.. so any help appreciated..i want to add some Klik lighting management boxes to the end of a circuit to control 10 lights. The circuit up to the ceiling rose I wish to utilise to feed my first klik is wired in conduit using 2.5mm cable. I want to add a two way lighting switch to control the...
    • markc17
    • Thread
    • 1.5 cable calcs circuit distance lighting using volt drop volts
    • Replies: 6
    • Forum: UK Electrical Forum
  15. S

    3 phase loading question

    Hello all I am working for a company and we are installing supplies to some industrial 3 phase heaters in a factory in Devon. I am questioning the maths used by my boss to arrive at the SWA size to supply these heaters. Seeing as I am not a wiz with 3 phase stuff (only just started working for...
  16. jackhammerJIM

    volt drop calcs and 230 v

    why do we have to do the calcs to 230v when the supply never is 230v measured voltage at source is 248 volts at the site i am on at the moment , can somebody shed some logic on the idea before i start engineering an 18 volt drop into my cable sizes ( a joke of course but why not ? ) :ihih:
  17. I

    sqaure d breakers

    Is a type 3 sqaure d braker equivelent to a type c breaker been to house was asked to fit mcb c32 to protect an oven and hob at roughly 6kw without diversty i know its not the norm to fit type c breakers for fixed restive loads i know they are used for comercial purposes where there is a high...
  18. 1

    Double check my VD calcs?

    Jusk seeking affirmation really, still new to this world and want to make sure I'm not making silly errors. 1). 6mm2 3-core SWA over 20m @ 230V: 6.6mV x 16A x 20m = 2.048V 2). 10mm2 3-core SWA over 20m @ 230V: 3.8mV x 20A x 20m = 1.52V 3). 16mm2 4-core SWA over 5m @ 400V: 2.4mV x 63A x 5m =...
  19. G

    Voltage Drop Calcs

    Hi, (new to forum, first thread) Trying to get my head round voltage drop and using the calcs in practice. I have radial circuit - 16 amp MCB on a 30mA RCD - 2.5 flat T+E out of household consumer unit, straight through wall and running in plastic conduit along outside of wall and into garage...
  20. P

    3 phase motor calcs cable sizes etc

    Hi am currently employed as testing and inspection on a industrial site just wondered if you could give me some advise What it is I got a 110 kw motor 180 amp 100 m run full load now I got a 75 mm cable supplying it . I have checked table 4d4a in the regs as it is 3 core armoured . Ref method E...

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