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value

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  1. A

    Determine the new current value

    Hi all. Freshman electrical installations student here. Please can someone help me with figuring out the formula to the following question, it's driving me nuts. The current through the field windings of a motor is 1.8 amperes when the resistance is 100 ohms. After 5 minutes the resistance...
  2. S

    Measuring Ze value??

    Hi can anyone give me a procedure to measure the Ze value of a house? I am currently studying to become an electrician and I am very much a rookie so please be patient with the baby step questions :-)
  3. R

    why a low earth fault loop impedance

    hi guys, Just wanted some help with some course work for college. Any help is greatly apprecitaed. Why should a low value earth fault impedance should be achieved for all circuts? thanks
  4. S

    What KVA value - Can someone help please for a tyre garage, MOT station and offices

    Hello all I am new to this site and i am glad i have found it as it looks crammed with useful advice from people in the know. I am not too familiar with how forums and posts work and i hope i have not made a mistake by uploading this, so please excuse my ignorance in advance if i have offended...
  5. B

    Three Phase Value

    For 230 volts x 1.732, use 398....hi to all my fellow electricians. Kind you explain me what is the 398 answer from the given voltage. Thank you!
  6. La Poste

    TT testing.

    If testing a TT installation which tester would you prefer? The Earth resistance tester or an earth fault loop impedance tester. I mean if you were to test with an earth resistance tester (the inserting spikes in the ground test) and get a value for Ra, would this value be the same value that...
  7. S

    The Value of External Impedance (Ze)

    Hi everybody can anybody help please all answers will be taken into account for proccessing thanks... can you please explain to the Newbie (ME) why is the value of external impedance (Ze) required during the design stage of an installation.. THANKS.....
  8. S

    cpc for shower?

    Need someone to put me at ease. Working out minimum csa of cpc for a shower using adiabatic equation. I'm using 10mm T&E with 6mm cpc, 17 meter run, no factors to take in to place. I keep coming up with 6mm cpc not big enough or is it just me. TN-S system. All help welcome.
  9. I

    What panels are best value

    Given the lower feed in tariff I assume most are reverting to cheaper panels. How do we know which panels are best? Is there a list anywhere that rates PV panels. I have seen comments on this forum that says some panels are good and others are crap but it all seems to be a matter of opinion.
  10. J

    PFC Testing

    Hi all. Just a question which seems to get me a bit confused about PFC testing. I understand that the value of PFC you put on a EIC or any other form is the highest value of either the PSCC or the PEFC. Now when you get the reading on your meter (which is sometimes displayed with the Zs value)...
  11. J

    Isc value too low

    (Please be gentle, its only my second install) I've just installed 10 RECs with an SB2500HF and i'm trying to commission for handover. I've measured the voltage of each panel, which was correct, and my Voc today was about 300V. However, I'm only measuring Isc of 0.4A. The install is a top row...
  12. P

    Peak Short Circuit Current value on the SSEG form.

    I've looked at the easy MCS guide on here, and it's not clear, (in my eye's) to what value you place in the part where it asks for this. I've done a pscc test at the AC isolator with my fluke, and it's giving me a reading of 600A. Is this what they want? There's no mention of it on the SMA...
  13. T

    High value Ze

    I have an installation (TN-S system) and the Ze measure is 3,89Ohms.The start point of the installation protected by ELCB 500mA.Some final circuits protected by rcbo 30mA and the rest by mcb.I suggested to the client the replacement of the feed cable but for economic reasons this will be late...
  14. ringer

    Checking Zdb at Garage Sub-board

    Have just installed a garage CU and want to check Ze/Zdb is ok Main board in house, Ze is 0.19ohm Garage board, Zdb is 0.44 ohm Zs on all circuits in the garage is well within limits given in table 41.3 in the BRB I know max Ze for the main board is 0.35ohm (as per the OSG for a TN-C-S supply)...
  15. B

    TT Testing advice.

    Evening all, Today was my first time testing a TT system.(Hooray) I have a couple of questions about my results if anyone can help. 1.Is the Ze reading the same as the RA reading?.My was 119.2ohms and this is ok yes because its between 21-200 ohms(ideally below 100ohms) 2.After testing the...
  16. Sparky Ninja

    Megger Mft 1730 calculating R1&R2?

    A student of mine had his new toy delivered today (delivery first thing, thank you very much Tester Meter). We've had a play with it and I am surprised to see that it has a method of caculating R1&R2 as what appears to be normal practice. You turn the dial to Zref, make a loop impedance...
  17. R

    part p full scope work

    Can i ask a simple honest question, all the lads who cough up quite alot of cash to train up as an Electrical Installer....do they hear of many people who find the move into the trade too difficult / not enough work etc,........ only when looking on ebay for a tester for myself (i'm just going...
  18. silver surfer

    RCBO operating times

    Testing a job yesterday and realised a couple of things, during the RCBO 1n and 5n tests in a lot of cases the 5n value was actually slightly higher than the 1n value,eg 1n=28.2ms 5n=28.7ms (?). Doesnt seem right that multiplying the test current x5 would have a slower tripping time (although...
  19. B

    2 jobs and 2 queries?

    Hi Guys, Two of the jobs I have on at the moment are causing me a bit of a conundrum on how to resolve them, so I thought I'd drop them on here to get your thoughts.... Job 1. I'm moving an 80a 17th edition DB 7m away from suppliers isolator, what size cable, can't find it in the regs? I'm...
  20. B

    Adjustable breakers

    In the case of adjustable breakers which value goes in the column for protective device i.e. if it a a 200a breaker and it has been tuned down to 180a?

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