sizing | Page 7

sizing

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  1. D

    DC 24V - Cabling Sizing -

    Dear all, I need to supply DC 24V power to long distance. The required power is low up to 9W. What is the maximum allowable voltage drop?
  2. S

    Cable sizing question

    As part of my HNC project I have to calculate the cable size for a SWA cable. It's 4 core (3ph and neutral) running in a trench with a 'roof' of concrete (theres a big air gap around the cable) with no other cables in the trench. The run is roughly 20m long. I've looked in the 16th and 17th...
  3. G

    Sizing a 3 ph motor?

    Hi, I am sizing a motor for a hoist. The mechanical output of the motor needed is 54,500w. Say there are 1.5kW of losses within the motor (stator losses, windage, etc)and the power factor of the motor is 0.8. What will the electrical input of the motor need to be? Can you show me how you...
  4. U

    Sizing bango earth fly lead

    Hi Guys, How do you know what size of earth wire to use from the bango to earth terminal in a DB, when using say: 25mm 4-core swa sub main feeding a DB. (L1, l2 l3 and neutral, armour used as cpc). I would gland, with a bango and choose a size half of the phase size, so 16mm earth lead...
  5. E

    Transformer sizing

    Hi I need to size a transformer for a 50kVA UPS System with a pf of.8 and one for motors with a load of 100kW with a pf of .8 also. Any help would be appreciated.
  6. ses

    Bonding sizing

    I have recently been on two jobs in factories where they have two incoming supplies. 1 3 phase supply for main factory and 1 single phase supply for offices. The gas bonding on the one job was 50mm fed from the main 3 phase met and the water bonding was 10mm fed from the single phase supply...
  7. W

    Designing a lighting system. Need some novice help cable and fuse sizing, volt drops.

    I am currently a final year control system design apprentice and have been assigned the task of designing a lighting system for a multi level platform. I have selected the bulk head lighting that I am going to use which is Petrel DN series Product data sheet is ...
  8. S

    neutral sizing

    when using a 3phase sub main for 3 single phases (230v) what size should the neutral be (supplying the sub main). Mr technical from a cable manufacturer told me that the neutral would be the same size as the phase conductors so i could use a 4c swa. so the neutral wuld be shared. My boss tells...
  9. C

    Help sizing cable for Farm

    Evening all, After a long week I've been asked to size a cable for the following: 70kva 100amp, 3 phase supply, 4 core SWA, 160m long run, buried. Would a 50mm suffice?:confused: Secondly, for a CPC, i was thinking to run in a 25mm alongside the armoured. Would you agree with that?
  10. D

    Cable sizing

    Hi Guys I have been arguing with a guy at work about some supplies he's been installing. He has installed two 16 amp three phase sockets using 4mm swa clipped and in trenches of about 30 meters he's protected it with a 32 mcb. The swa terminates in a switched fused isolator with 32 A fuses...
  11. C

    Sizing bonding for subboard

    After a couple of bonding conductor questions I had I've started a new post for this so it's more specific. I have a TN-C-S installation, at least 70mm line and neutral at the incomer, feeding a main distribution board which feeds 8 x 3 phase boards around a site. We are installing a 16mm SWA...
  12. A

    Gland Sizing for 10mm2 SWA

    Sorry for this query but want to double check on this. I've terminated 10mm2 SWA before and always used a CW25 gland. However the knockouts on the enclosure I'm working on are 20mm and some sizing guides suggest a CW20 is suitable for 3 core 10mm2 SWA. Can anyone confirm whether a CW20...
  13. B

    cable sizing help reqd

    hi guys, starting a new job on mon whoop whoop back to the rat race problem is i need to visit many sites and make quick descisions on sizes of cables etc but i was wondering if anybody knows of some type of software or online calculator that will help me do this quicker rather than spend hours...
  14. B

    cable sizing equation

    when determining cable size and you want to include the following thermal insulation(Ci) and circuits grouped (Cg) what tables do you use for the rating factors many thanks
  15. M

    How to calculate sizing of vacuum circuit breaker

    Hi- I am looking for some help/ advice please. I'm confused about how How to calculate sizing of vacuum circuit breaker. This project I work on it use 40m0A TP Vacuum circuit breaker to support pump 800 kW 11kV I calculate the current just 49.4 A (800*1000/1.732/11000/0.85 ) I don't know...
  16. D

    capacitor sizing calculation

    does anyone know how to calculate capacitor sizes for capacitor start, capacitor run single phase motor? manufacturer info not available.
  17. S

    cable sizing help please!

    Hi all, just new here today. Just want a few opinions on cable size needed for a cable run from a main dis board to a sub dis board. It's 3 phase 400/230V system so will be using either 5 core swa or 4 core swa with separate earth. It will be run in buried duct. The cable run is 80 metres...
  18. B

    Spur Cable Sizing

    Hi I'm adding a fused spur (6A) to a 32A ring to power a central heating boiler. Does the spur cable have to be the same CSA as the ring (2.5mm) or can I reduce the cable size to be minimum size required for load on that spur ? Also, is it then treated as a radial circuit for sizing/speccing...
  19. J

    Earthing and bonding sizing

    Righty, I may be suffering from brain fade on this so please bear with me.... In a domestic situation up to 100A it is generally accepted that for a TN-C-S supply, earthing and bonding must be 16mm & 10mm respectively and if this is not present, we must upgrade it. The 10mm bonding is plain to...
  20. S

    cable sizing for SC withstand

    Can any one post the values of "k" for various conductor materials like aluminium and copper when used with insulations like paper,pvc,xlpe,mica,micc,enamel etc

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