calcs | Page 5

calcs

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  1. michaelw6

    free decent 17th edition cable calcs?

    can we post? Does anyone have any freeware/shareware 17th edition cable calcs that are tried and tested as i think the one i use is not up to scratch.
  2. J

    Transformer Calcs

    Hiya, i have 3 questions>>>> A CE marked self contained ELV Lighting unit operating at 24v has a 50W bulb. What current will flow in the transformer primary A> About 2 Amps B> About 1 Amp C> About 0.5Amp D> About 0.2Amp A CE marked self contained ELV Lighting unit operating at 24v has a...
  3. S

    yield and efficiency calcs

    Hi all I need a book or something online to help me spec my first system which i want to use for my MCS registration job. The installation will probably be on my own house. i'm looking at the Schott poly 220 modules and i'm confused whether i should be using the electrical data at STC or...
  4. N

    Cable Calcs - can anyone check my logic

    Hi, Calculating - for the first time - SWA buried cable. The design current (Ib) is 12 amps The cable run will be 20 metres, buried in the ground. I'm looking at 2 core SWA, using the armour as earth (no grouping, ambient temp changes (other than buried) or rewireable fuse factor to...
  5. D

    heating calcs

    loooking to calculate storage heating KW needed is there a rough formula for this KW per meter cubed or something thanks
  6. S

    cable calcs

    hi, could someone please explain how to do cable calcs and de-rating. cheers
  7. D

    motor calcs

    how do you take into account starting current when sizing cables for 3-phase motors in general thanks
  8. C

    Max Demand Calcs

    Hi All, Just wondering if anyone can help with calculating the Max emand for the following - I have carried out my own calcs in three different ways and keep coming up with a very high figure. This installation will be single phase and run off a sub main U/G cable. 4x 58W strip lights 8x...
  9. P

    electrical calcs

    Free Online Calculators for Engineers - Electrical, Mechanical, Electronics, Chemical,Construction, Optical, Medical, Physics, etc...
  10. D

    Where am i going wrong (warning - calcs!)

    So, I have a 5.9Kw cooker, running through the cable calcs I end up with S of 9mm:confused: Cable run is 1M, by my reckoning Ib - 15A In - 16A Ref C No Correction Factors (clipped on wall not using BS3036 fuse) It - 16A Iz - 1mm Vd - 44x15x1 /1000 = 0.66 R1&R2 - 36.2x1.2x1 /1000 = 0.04 Ze...
  11. T

    Diversity calcs

    Can someone check my calcs for me, this diversity stuff is mind numbing, read for different books and get four different answers, the figures below are based on the OSG Table 1B Table 1B Maximum Demand after Diversity A slot in electric cooker with a total rating of 9kw, no socket...
  12. Amp David

    Derating Calcs.

    When selecting the derating factor for a cable and the cable requires more than 1 factor to be applied, is it correct just to use the lowest factor, hence derating the cable by the most. Been studying tonight and still not grasping the theory 100%:confused: Thanks for any help offered:)
  13. S

    Old problem with circuit length calcs

    Sorry to bring up an old post but im confused. I have carried out tests on a kitchen ring final wired in 2.5mm/1.5mm T&E, results as follows: r1=0.36 rn=0.34 r2=0.59 I then joined leg 1 of line conductor to leg 2 of cpc and leg 2 of line conductor to leg 1 of cpc and measured the R1+R2 at...
  14. H

    cable calcs question

    i'm doing the 2391 course not sure about a way we have been shown with regards to rewirable fuses (not quite how i remember 20 years ago) heres the example - 7000 watt heater to be covered by a rewirable fuse current is 30.43 amps, fuse will need to be 45a now he has applied the correction...
  15. S

    Cable Calcs

    Hi All, I'm rewiring a garage. There is SWA into the garage and I intend to fit a new RCD protected garage CU with 16A & 6A breakers. Would you recommend putting a 25A or 32A breaker in the main CU ? I haven't inspected site properly yet but I just had a thought with respect to the existing...
  16. T

    cable calcs

    what cable calculation pc packages can everyone recommend? or does every one just do it the old school way? cheers

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