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value

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  1. L

    Max Zs Permitted by BS7671 value

    Hi All, Thank you for welcoming to this forums I just want to clarify that the Value I need to enter 100% or 80% in the last column "Maximum Zs Permitted by BS7671" is it 80% from the table 41.3 from 18th Edition Regs - Page 62 or the value from Pocket Guide 18 Thank you Loges
  2. S

    Ring final circuit conductors and value Zs and R1+R2

    Hi all, I would like to ask you about ring final circuit canductors and schedule of test results. I have got dedicated ring circuit to supply kitchen appliances. Circuit is protected by mcb tybe B 32A. Then supply is split into radial circuits to supply appliances by switched 13A FCUs. What...
  3. Michael J

    The maximum value for Zs on a TT system is 50/I delta. So for a 30mA RCd is 1667 ohms

    why is this not the case if the final circuits on a TN-S or TN-C-S system are protected by a RCD? Funny what you think of when you can’t sleep
  4. U

    Why I get netagive value from power meter (powerlogic pm500) for the reactive and Active Power?

    i read data every minute, and some time i get negative values, can any one explain me, i'm not an electrical engineer (i'm IT developer) so please be nice with technical terms.
  5. 1Justin

    Best value fused switch plus 2 module type 2 SPD?

    Has anyone done this yet on a budget? I'm pricing a job to run a submain off a TN-S. I'll need a fused switch incorporating SPD alongside in the same enclosure. Price sensitive. Thinking of a budget Lewden off the shelf fused switch (in 4 module enclosure), ditching the enclosure and buying 6...
  6. T

    Calculation of capacitor value for conversion from star to delta

    Hi does anyone have a notion of how to calculate the capacitance value for the above?
  7. Dozer 73

    Wholesalers who’s the best service and value

    asking this because our company uses .........wait for it CEF And yes I know!!!!!!!!!!!!!! They do stock and provide us any manafacture we require , and provide us a good service , but I do know these prices are highly inflated , even dearer than general public prices Which really annoys me...
  8. R

    Phone calls asking if I want to sell/know value of my Business

    Hi all, I`ve been trading for the last 8 years, in the last 8ish months I`ve been getting calls from firms asking if I would be interested in selling my business. Also getting calls saying that they have clients that want to invest in the area and would I sell or when I say no they ask whether I...
  9. HumbleWorker 91RT

    Best Sockets for value and longevity?

    Just wondering which sockets you guys tend to go for, your typical plastic units for internal no brushed steel effect types, as well as your external 1 and 2 gang 13 amp. Based on price low to hi, brand perceived view (high quality through to Chinese crap) and ease of installation has good...
  10. D

    16 amp commando sockets. 20 amp mcb on site guide as maximum value mcb

    Hello the on site guide lists 20 amp maximum mcb for 16 amps sockets. Having a debate with someone as to why this is? Why not 16amp mcb? I installed 20 amp mcb as it's for a car charger that charger's at 16amps for 8 hours and is not capable of pulling more than 16 amps but this has been pulled...
  11. E

    When Filling Out A N.I.C Installation Certificate Online *DEFAULT PFC VALUE*

    Why does it try to give you the value of 16KA in the drop down box for prospective fault current. Has anybody else come across this or do they know the reason why? I always put my measured value in but still would like to know the reason they try to give you the above value.
  12. Zdb

    Obtaining R2 value on RFC

    If for whatever reason you can't do an R1+R2 test on a ring final circuit (unable to identify opposite legs). There's also an option on the paperwork for the R2 value... Am I correct in thinking that you do an end to end test on the CPC's which would give you r2, then just divide it by 4 to...
  13. T

    High Zs value with 2 sockets

    Hi all, Doing some pre board change testing and ive found 2 sockets with high Zs readings. Everything else is fine, done all my end to ends and the Zs's are what should be expected. A couple of the sockets have Zs lower than expected but 2 are higher. They should be about 0.8 ohms but ive got...
  14. polo1

    Exceeding max adjusted Zs on a board change.

    Testing during a board change, a RFC on a 32A 60898, with rcd protection, you find that the max Zs is exceeded by 0.1 ohms using the no trip setting on your mf tester On the EIC do you - A) simply record the actual measured value B) record the actual measured value and note the position under...
  15. haptism

    R1 + R2 of ring circuit

    Hi for a ring circuit, is there any need to measure and enter R1 + R2 values on a schedule of results ? Because an r2 value is already measured (together with r1 and rn). If I needed a ring R1 + R2 value to calculate ZS (although i would find ZS with a socket tester so really no need; but if I...
  16. L

    Soil resistivity

    Hi, How can I change earth resistance (R) value into soil resistivity (Rho)? Is this formula correct, ⍴ (Rho) = 2πAR (A = Distance between pegs, R = Earth resistance). Regards, L.
  17. haptism

    SWA test results

    Hi hope someone can advise; ive not done alot of testing or filling out eic's and am a bit stumped on this. I have run the usual dead tests on a 3 core swa cable used on a final circuit all tests are good. However the amour (which needs to carry the full fault current), does it not need to be...
  18. A

    Comparing heating usage Propane vs Elec

    Hi there, I do hope this is the right place to post this! I basically want to compare energy consumption in heating between two buildings. Building A has a purely electrical heating system and I can get how many kWh are consumed in one month. Building B has a gas boiler which uses 47kg...
  19. J

    Questions in power engineering interview

    I would like to seek advice from experienced guys because I have interview test for my power engineering as below. Thank you. a) For 600A switchboard, what type of device setting need to do? Can I say that I need to do setting for direct acting for MCCB since more than 100A and earth fault...
  20. K

    Best value mft???

    Hi all Hope your well, my metrel finally packed up today and after ringing metrel uk for a repair price (£169 plus vat) I've decided to get myself a new kit. I've been looking through tester mans site and the megger mft1710 and the kewtech kt63 look decent testers and within my price range, has...

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