calcs

calcs

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  1. C

    2365 cable calcs help

    Just wanting some advice on wether this is all good and where I have gone wrong if not, cheers
  2. M

    5 core swa cable calcs

    Hi there , is there anything else to consider when using 5 core SWA instead of 4 core + separate Earth in three phase installations for cable calcs etc? Apologies but just moving in to the 21st century never used 5 core before
  3. W

    If you have 3 single core cables in conduit for a singular circuit would this be classed as bunched?

    Hi there, I'm Currently doing my design calcs for my college project and doing the actual Zs calculation. Formula is Zs= Ze (or Zdb) + (R1+R2) Then for (R1+R2) you find the (R1 +R2) per metre value in the On site guide appendix i - i1 , which for me line and cpc are both 1mm so its 36.20 . I...
  4. Simon-0116

    Cable calcs zs and ze values

    Cable calcs using cable calc app Working out cable size for a workshop. 100m long, 100a supply, mccb 100a zs- 0.23 ohms, in a duct on its own, tt earth on 300ma rcd.- 20 ohms App says 50mm swa which I expect. But if I alter earthing to tncs 0.35 ohms it says max ze exceeded zs of device...
  5. B

    help on cable calcs power

    not to sure on how to find the wats for the power cable calcs could anyone help me its for a ring with 3 Dubble sockets on DB05-3L2 cable size: 2.5mm temperature rating:90°c total demand 32a 29.125m Design current w/230 lb= 0.547A Ambient factors 1 cable Ca=0.91 Cg=1.0 It=design...
  6. Rockingit

    r, x, & z - cable calcs

    Interested to hear how different people approach doing loading / vd calcs for larger size single core cables in a 3ph situation - ie 3 separate L1, L2, L3 & N cores above say 95mm.
  7. Aaronj46

    Canalis calcs

    Looking at a warehouse contract which requires 190M runs of canalis with 31 x 200w lights. Volt drop is 0.72V per Amp per 100M for 25A 3phase Canalis and 0.3V per Amp per 100M for 40A 3phase canalis. Am I right in thinking the 40A would be fine? Consultants have said that they want the runs to...
  8. T

    3 phase cable calcs

    After my last post and having and having to re-learn some stuff can someone check and advise on a few things. Sorry if this is wrong don't hate, will make a good learning exercise as my mentor won't help me and hopefully will help others. Specification 16 circuits- wired up to caravan hookup...
  9. T

    Cable calcs 3 phase

    Its been long since I was in college doing cable calcs and obeing onsite as I've studied a completely different course at university, I understand de-rating factors but need some clarifying up to brush up. If I need a 600A supply which can be split 200A each phase. and being supplied via SWA...
  10. James.B

    Looking to install a 3ph supply for 2 x 6kW fryer in a commercial kitchen.

    Hi everyone, I've looked at a job to install a circuit for a 2x 6kW fryer in a commercial kitchen and would really appreciate a second opinion on my calcs, attached in photos. Many thanks in advance.
  11. A

    Maximum demand calcs

    Hi guys. Just looking at how people work out their max demand for supplies to consumer units. Looking at a board change with 7 circuits and going by osg working out to be over 80a I have heard of the 40% rule of total load but was wondering if any others have a different method. I cant see an...
  12. S

    Question about diversity calcs

    hi all, Looking for some advice on the main fuse for a property I’m developing. It’s going to have 6/7 studio rooms, all with microwaves and potentially a hob. Set over 3 floors if I were to have a separate light circuit for each of the 7 rooms at 3amps per room, that’s 21amps at full...
  13. S

    Am2 calculations on test sheet

    I’ve got my am2 tomorrow morning, I’m pretty confident with everything and just gone over my testing and done the prep day yesterday, I was just wondering if anyone knows what calculations are needed on the back of your testing sheet to pass? I’ve got r1+r2/4 for ring final, zs=ze+r1+r2, my...
  14. R

    Any quick calcs to get a rough min Zs allowable

    Any quick calcs to get a rough estimate min Zs allowable for protective devices MCB, BS-88 etc, Im thinking in an exam saves time even looking at the tables if there's a fast ball park check rule of thumb.
  15. T

    High Ze Cable Calcs 20 characters

    So I have a job to quote for installing an outdoor sub main. It's in quite a rural location and the supply seems to be TNCS. However, there is another conductor that leaves the MET and looks like it could possibly go to to a rod (the cable that leaves through a hole just to the left under the...
  16. F

    Rusty on cable calcs

    Hi I’m a little bit rusty on cable calcs it’s not something I’m involved with that often for various reasons, ie promodantly do fire alarms and the small works we do are incredibly small and we tend to install 4mm to be safe. I remember seeing on here a formula which calculate the maximum...
  17. E

    Cable Calculations?!

    Looking at putting a lathe into a workshop.. 16A, 3 phase, a run of 19metres at approx 35 degrees. Also, a 3 phase, arc welder which I was going to put into a 32A socket outlet. 7 metre run, again at 35 degrees. Can someone help with how I would complete a cable calculation for either...
  18. G

    Rangemaster diversity calcs

    hi all I've got a Rangemaster to install and just want to check my diversity calcs. It's say it's 14.5kw so I make the 63a using diversity I make it 26a or with a socket 31a. There is a 6mm cable on a 32a mcb, I'm thinking of changing it for 10mm and 40a mcb as its a bit close to max of the...
  19. E

    Ci - for cable calcs

    Also just revising: trying to apply a rating factor for insulation on a cable calc. Just in theory, it's not for an actual job. The cable will be clipped direct to joists above ceiling and is covered in >100mm thermal insulation. I cannot find the correction factor for insulation. Advice please!
  20. uksparks

    2396 Design Course

    Hi, Long time no post... been very busy and simply not had time, actually its probably been since last summer, you know, got married, then kids started school in September, the Mrs says put that sodding phone down etc.. Anyway, I am about to book on the 2396 Design course. I know roughly...

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