calc

Recent contents Top users
  1. I

    Cable Calc

    Hello Existing 69kva supply with the board 100m from the incoming supply (within a shopping centre). Three phase board supplying lighting and power circuits. Cable ran along a corridor on cable tray/ladder. Online Cable calculators saying the run is OK for 25mm 4core but when I’ve used the...
  2. J

    UK Thermal constraints on a ring Electrical design question

    Hi all, I am working on my revision for the 2396 exam and wanted to see if someone brainier than me could advise, when completing the thermal constraints equation t=(k²*s²)/I² on a ring circuit do you input the ring for s² as (2*2.5)². Example1 : Fault current 211A t= (115² * 2.5²)/ 211²...
  3. M

    Updating cable calc spreadsheet

    Hi All, Just looking for some advice: I'm in the process of updating an old cable calc spreadsheet that helps to spit out Zs and Voltage Drop figures but I'm just looking for some clarity on figures. For 3-core 16mmsq SWA, single phase, I'm looking at table 4D4B in BS7671 and it states...
  4. I

    Cable calc confirmation required!

    Think I may have been oversizing cables for some three phase circuits... For example, when ive calculated a 11.5V volt drop on a general circuit I've took this as being the 5% allowed but I've just come to realise that maybes this is actually a 2.875% volt drop at 400V Can someone confirm...
  5. C

    Conduit Calc

    Hello guys I need to install X4 95mm tri rated tails in some metal Kopex Nominal Overall Diameter 18.7mm What size kopex would suit this cable bunch and does anyone have current carrying capacity guides as for a 200a supply 70mm tri seems capable in some cases but 95mm might be needed...
  6. bigspark17

    Kva 3phase demand calc

    Hello all, looking for a bit of advice not been asked to fill in a new power supply for dno for a commercial premesis before. Do i put 70kva for a 3 phase supply that equates to 100A 3 phase head? Usually on single phase i put 18.4kva for 80 supply and they always provide 100A head. Thanks in...
  7. R

    Diversity Calc Commercial Dishwasher 6.5kW single element

    It is a 6.5kW thermostatically controlled water heater if you ignore the rest of the gubbins. So that would be a Purpose #6 for diversity ie: None allowed. = 28A. But you could treat if like a cooker too. Purpose #3 ie: 10A + 30% FL current over the 10A. = 15.4A What do you think? Thanks
  8. N

    Voltage drop calc

    can anyone tell me if this is a correct way of thinking i have 6 Cleaners outlets off a !6a rcd, total run length is 55m 6mm feed to first point is 30m would give me voltage drop of .78% (using half the breaker load according to exception 1 on page 163 of as 3000:2018) then run a 2.5mm for...
  9. john waters

    UK calc help

    Hi its been a while since college and need some help with a calc. I have been asked to put in a supply for a old spot welder ,The only info i have is its 150 kva 2 phase . I need help to calc amps
  10. G

    Single phase circuit on 3 phase system calc

    Hi, I have a query about calculating current in a 3 phase system. So a 22kw load in 3 phase assuming a power factor of 0.8 would be 22000/(1.732x400x0.8) = 39.69A and say a 7.2kw load on a single phase supply would be 31.30A if you simply use ohms law. But what happens when you calculate the...
  11. Michaelwgroves

    Complex Installations demand calc

    I've treated myself to the IET Electrical Installation Design guide. I've been looking at section 3.5 Complex Installations. There is a calculation for calculating demand based on number of dwellings in a group. Please see picture of relevant page. Seems simple, sub domain is 66.44A, demand...
  12. gazdkw82

    CSA main earthing conductor calc

    I'm trying to understand the different ways I can calculate or find the correct size of main earting conductor of an installation. Iv found a formula but it's quite long winded. Is there an quicker process? Here is what I have at the moment after doing some research and practice
  13. J

    How to calc size of wire rope

    Needing to suspend 40 meters of wire Rope for 1x camera lead, looked at 4-6-8 mm and theirs slot of price difference, is their any way to calc what size is needed or recommended please? Thank you Sent from my iPhone using Tapatalk
  14. T

    125 kva supply cable calc

    Hi, We are undertaking quite a big job for an extension at a school and as it is a little out of our experience i was hoping to run it by a few of you kind folk before we have another meeting with the client on Tuesday. I've read through the forum at cable calc questions and i know they can...
  15. Y

    DC Volt Drop Calc

    Hi all, I appreciate this has probably been posted to death but the search wont load on my phone. I have to calculate for Volt drop in a DC circuit, There's next to no load (2 amps max) the cable is 4mm pvc twin, and ln a loop from the control unit to the loads. OveralL Length 50m Is the calc...
  16. A

    cable calc query

    This may sound like a daft question but in the on site guide appendix f table f6 it has many different reference methods of installation of twin and earth. it has : above plasterboard ceiling covered by thermal less then 100mm above plasterboard covered by thermal more then 100mm stud wall...
  17. K

    Cooker Cable Calc question

    Hello, Just doing a Cooker Cable Calculation for a Rangemaster Toldeo 110. Total Load is 17.4kW Calculations 17400/230 = 75.65A First 10A = 10A 30% of remainder (65.65A) = 19.70A Cooker Point with Socket = 5A Total Current = 34.70A Cable will be layed under floor then chased into wall...
    • kiwiNCFC
    • Thread
    • cable calc cooker cooker cable question
    • Replies: 13
    • Forum: UK Electrical Forum
  18. P

    Cable calc??

    Hi guys just looking for a bit of help / advice i have a 100amp 3 phase isolator tap off connected to a rising bus bar. im installing a new 16 way 3 phase DB approximately 55 metres away from the isolator. it will be wired in 4 core armoured on tray, and on its own located with in a ceiling...
  19. Z

    cable calc for 9kw electric boiler.

    This is my first post and not sure if in right place! My company have asked me to quote for a supply to be run for a 9kw electric boiler, the run will be through a ceiling void with under 100mm of insulation for about 20m, I used an online cable calc as I dont have my regs book to hand, which...
    • Zak Jennings
    • Thread
    • boiler cable calc electric electrical
    • Replies: 4
    • Forum: UK Electrical Forum
  20. H

    cable calc

    guys and gals. This is a little bit out of my comfort zone, im trying to provide a cable size for 100a 3ph crane temp supply(1 yea) in ducting 35m could someone give me the ammo to work it out? im sure its m/v/a/m2 x ib x L / 1000 I DONT WANT IT T BE 70MM ££££££££ THANKS
Best EV Chargers
Best EV Chargers by Electrical2Go! The official electric vehicle charger supplier.

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc

Advert

YOUR Unread Posts

Daily, weekly or monthly email

Receive a daily, weekly, or monthly email containing a digest of new and recently updated threads.

Advert

TrueNAS JBOD Storage Server

UK Tiling Forum | Tilers Forums
UK Tiling Forum by Tilers Forums UK
Plumbers Forums | Plumbing Advice | Gas Forum
Electrician Tips from Professional Electricians
JBOD Forums: a forum for JBOD storage server advice
JBOD Suppliers: JBOD Storage Server Supplies
Back
Top