sizing

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  1. MFS Electrical

    Cable sizing full process

    when I was an apprentice, one of our lecturers had us copy out from start to finish all of the equations for cable sizing and de-rating on the very back page of our regs book . And where to find the various factors I know that the equations are obviously in the regs but just wondering if anyone...
  2. N

    Extraneous Parts Earth sizing

    Customer wants to take power from an existing garage (with board) to supply a greenhouse, to be fitted with ip rated switchgear. The greenhouse is made of aluminium. Since this is an extraneous conductive part am i right in thinking that the aluminium frame would require a 10mm bond at least...
  3. L

    Fire barriers when cable sizing

    Hi I am hearing different things, some people have said no and some yes. Do rubber and foam fire stops through walls count as thermal insulation when cable sizing? Thanks
  4. L

    Control panel feeder cable sizing

    Hi, We have a control panel that has a vsd, plc and motor anti condensation heater. For a preliminary cable calculation for the control panel feeder cable and its associated protection, would we just total up the individual loads to arrive at an approximation and use this to size the feeder...
  5. L

    Fuse switch sizing for a vsd

    Hi, Following on from my question about reusing a fuse switch to supply a control panel containing a vsd. The rating of the drive is 18.5kw. We will need to use a motor rated fuse. We are planning on using a 10mm cable from the switch to the control panel. My query is would a gM32m 40A motor...
  6. J

    HELP sizing SWA___________

    For a Job I need to extend and relocate 3x SWA cables, after inspecting the cables I first concluded that they were 25mm 2core, after then comparing an off cut of 25mm 3 core to the existing cables the 3core appears the same size or even possibly smaller, I am now pondering if the existing...
  7. B

    What contactor size for a 9kw electric boiler

    Hi all. Don't have much experience on this topic. Called to a job with an electric boiler. It has a dedicated 10mm supply from a 50A MCB. I narrowed down the fault the the contactor which was only feedig 1 of tge 3 elements and had scorching marks around the other 2 terminals. And is currently...
  8. Y

    Need Help with Breaker Sizing 3 phase

    Good day to all. Please correct me if im wrong and also want your professional inputs. I am servicing a pump motor rated at 415vac 3 phase 11kw power. The breaker is at 20amperes. The complain is everytime the motor automatically stop when the tank is full the breaker always trip during the...
  9. B

    Sizing a Switch Disconnector for my Panel using 3 Phase & 1 Phase components.

    Hello there I have a panel i'm designing that contains inverter drives, Power supply and a UK Socket. I want to calculate the size of the Switch Disconnector needed using the current drawn from these components. I have 400VAC 3 phase & 1-Phase 230VAC. Here is a list of the components Current...
  10. charlie76

    Garage Sub Board SWA sizing

    Evening folks. Quick question, I am installing a garage sub board which will have TT earthing. It has a 40A 30mA RCD main switch and I will be putting a B16 and B6 in the board. Would you size the SWA for the breakers i.e. 22A or for the main switch 40A in case someone swaps out an MCB in the...
  11. Adie moore

    conduit sizing question

    I'm using some conduit on a job and I feel like I'm going round in circles. when deciding what size conduit is required I can't find anything in the byb, just things similar to the link below. and am I right in thinking this is purely a guide as to what can be pulled in easily? the only other...
  12. Andy-1960

    Sizing power cables part installed in ducts

    Anybody help with the sizing of power cables when the cable is part run in a duct. The supply in question is 630A, so it makes a big difference! If the cable run is 40m where 8m is in a duct, do you have to rate the cable as if it was in a duct for its entire length? The supply in question is...
  13. L

    Control panel feeder cable sizing

    We have a control panel that has a few fan motors (3phase) and two heaters ( 3 phase) and single phase loads to valve actuators. My question is regarding the sizing of the feeder cable to this control panel. Do we work out all the currents individually and then add them and treat this as a "lump...
  14. Gavin John Hyde

    sizing of RCBO's for different make boards

    I am looking at some rcbo's for a job im planning. Does anybody have or know of a link to a list of the sizes for different makes of RCBOS and what boards they fit. ie make A RCBO will fit CU makes x,y,z etc.. As it is a pain in the a**e with them always being different sizes... I am...
  15. Sintra

    A Short Guide To Working Out Cable Sizing

    Sintra submitted a new resource: Cable Sizing - Cable Sizing Read more about this resource...
  16. D

    Fuse Sizing

    Hi I have been asked to size a few fuses up for some machines to protect against short circuit, i have been given the total kW which is 230 and its 3 phase 400V. What other information would i need? I Have had a quick guess at 450A put im not sure how to work it out. any help welcome thank you
  17. Y

    Sizing a Contactor.

    Morning all, Possibly a simple question But a mix of doctor prescribed medication and post Wembley joy have left my brain elsewhere. I have a sub DB that needs the supply isolating if a fire is detected (commercial Kitchen) So The 3 phase supply for this DB needs a 4P contactor. Do I size the...
  18. H

    VCB Panel sizing

    How to calculate sizing of vacuum circuit breaker ?
  19. S

    Cable sizing

    I am about to embark on a project to convert the top floor of my garage into a small granny annexe. There are lots of considerations to make, but one of them is the electric supply. The garage is about four meters away from the house. At present, it is served by a 6mm twin and earth single...
  20. P

    Cable and mcb sizing

    What is the proper way to size this up. 7.5 kw 3 phase + n motor in a dry cleaning machine. Is it 7500/400x1.732= 10.82 amps per phase = 2.5 mm2 in trunking method 3, 21amps current carrying capacity Do i have to oversize the cable for inrush current? Or is 2.5 ok? Thanks.

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