calcs | Page 3

calcs

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  1. 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...
  2. 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...
  3. P

    3 phase motor calcs and fuse sizes

    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...
  4. i=p/u

    dis cable calcs

    have a 3 ph tn-c-s installation and want to run from main fuses to new 3ph board 40m away..in swa so say my ze at incommer is 0.12 i have to work out to keeep ze low enough which is fine, but where volt drop is concerned ... what is my limits on this ditribution circuit,,? if i use 25mm...
  5. P

    Query on cable calcs

    Just a quick one.... When working out cable calcs I have always used the Ib<equal to In<equal to Iz. Unless overload protection is not required for the cable Iz can be taken from Ib. (It)...i believe is the tabulated values in the tables in appendix 4. Iz is the current-carrying capacity of...
  6. 1Justin

    Constructive diversity calcs. - OSG method or just keep it reasonable?

    Diversity. How do you tend to justify domestic installations when you come across what seems to be really common 60A BS1361 supplier fuses, where it all looks too tight according to recommendations in OSG? Say we find 30A ring upstairs and 30A ring downstairs for starters. (plus 2 x lights...
  7. W

    3 phase volt drop calcs

    Hi guys, Looked over some previous posts and done some further reading, and attempted the calcs, just want to check that i am not miles off the ball park here with this. From what i have read harmonics and current down the neutral will cause massive fluctuations in results not to mention...
  8. B

    Volts drop too high...

    I have installed Ring Final Circuit in 2.5 LOR 120m protected by 32A breaker Volt drop calcs - 18mv/a/m x 32A x 120m / 1000 = 69. So the volts drop is 69 volts? which is way over the stated 3 or 5 %. Am I diong this corectly and if so what can I do about the volts drop? Cheers
  9. F

    Volt drop

    Ok you do all your calculations to determine your volt drop and your calcs come back that the volt drop is just above the 5% allowed ok I no it dosnt conform to bs7671 and you should increase the csa of the cable to next size up but what effect or could some one explain in simple terms the...
  10. 0

    electrical calcs

    hi sparkies :smile: Does any one no where i could find calculations triangles and other calculations that i can use
  11. W

    Diversity calcs - need more copper my way, cant do the maths.....

    Alright there lads, Its been a little while since my last post ive been AWOL somewhat and been involved in other business. But now i have returned to the world of ball ache and once again, in need of some advice. I hope you are all well. i need to spend some time over the next few days trying...
  12. K

    16kw 3 phase load. do I NEED 4 OR 6 SQ CABLE? Thank you

    16kw 3 phase load. do I NEED 4 OR 6 SQ CABLE? Thank you
  13. F

    Small Commercial system help

    Good afternoon, We have been asked to install 10 panels on a bike shed in the grounds of a new eco friendly office block. We have only done two domestic systems before and are still newbies. I am unsure about whether the SAP calcs are the same for commercial and is it a G59 even though its only...
  14. S

    Cable calcs?

    Hi, Im doing some work on my 2400 Design and verification course (or whatever its called now) and i have drawn my circuits onto my building plan, but having worked out the outside lights they are way over for VD, i increased the cable size to 2.5mm from 1.5mm this helped, but not enough. As...
  15. S

    wall mounted system - wind load calcs

    We have just been to quote for a job :party:where the customer wants a wall mounted system. I have no issue with this but it got me thinking about the wind load calculations - everything I have read is to do with Roof-Mounted systems. Can anyone advise whether they will be required for wall...
  16. Amp David

    Volt Drop calcs max load help.

    Looking at a job at the minute which is only for 3 IP rated double sockets down a garden. Problem is the garden is almost 35 meters long, then its another 21 meters from switch fuse in the house. Anyway, what I need to double check is when choosing cable sizes for my runs, what is best to...
  17. B

    Distribution of load on a ring final for Voltage drop calcs?

    Just pondering my voltage drop calcs for a fused spur off a ring final. Additional circuit will be around 15-20m long so I though I should do this properly.... My problem is calculating the voltage drop in the existing ring to the point of the spur which of course depends on distribution of...
  18. B

    Wind Load Calcs

    Has anyone out there got a simple spreadsheet to calculate wind loads on PV and ST panels. MCS are picking up on this more and more and I'm struggling to find something suitable.
  19. E

    Help with cable calcs

    Hi all, just after some help with the following, i have use the cable cals template as seen inthe sticky at top of forum. Have been asked to price for a sub-main to a new shed/office being installed in garden. TNCS system at moment, ze unknown, but have used max of 0.35 for calcs cable run to...
  20. O

    Ballast Calcs - flat roof array frames

    Sorry if this is out of place here... But any advice from real world experience would help. Rather than designing PV system using off the shelf mounting systems like Consoles for example where the ballast requirements can easly be ascertained from the installation manual, I'd like to explore...

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