measure | Page 4

measure

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  1. M

    unable to measure Ze!

    Hi all, we are currently carrying out PIR's on resisdental properties/flats, but only the common areas,landlord supplies.My problem is that today i came across a landlords supply which share its supply with lots of flats and for various reasons i was unable to turn off supply, disconnect main...
  2. carl9254

    Minor Works Cert

    What tests do you do on a minor works job?? I know some certs ask for different ones but my main question is if it asks for zs and the job is an extra light or something extra off a lighting circuit then do you leave zs as it will all be live?? Thanks.
  3. X

    Help. Any way to measure the length of a self regulating trace heating cable?

    Here's the problem. We have a self regulating trace heating tape installed on a piping process line where we need to know the length of the tape. The tape was estimated to be 10 metres (approx 32.8 feet). However the guys who installed it have reported that they have installed 19 metres...
  4. U

    correct shower rating??

    ok, without visiting the premisies and without testing the actual voltage, what is the score with this specific shower. existing set-up 6mm T&E 40A mcb with rcd protection old shower was 8.7kw load / 9.5 kw supply voltage??? so instructions read! new shower, still in box instructions...
  5. A

    PV Array testing help

    I am slightly unsure about some of the tests on the DC side of my PV installation. I can fill out Voc (stc) and measure it in the string test too. Insulation resistance is no problem. My current short circuit string test Isc reads 0.99A. This seems low to me, any ideas? The DTi guide also gives...
  6. telectrix

    1 circuit?

    hi, guys, slight confusion here, installing a lighting circuit in a barn. job is likely to be used for assessment so it's got to be spot on. Coming from 10A MCB in 1.5mm to 2 gang switch, one switch for each of a bay of 4 x 6' twin fluorescents ( both runs in 1.5mm ). Done the cable calcs no...
  7. T

    NIEIC inspection

    Hello everybody Ive got my niceic inspection soon. On my recent fuse board change and test i completed Zs tests for each circuit but only calculated R1 + R2 (apart from the ring mains) IS THIS OK? Also if anyone has had the niceic guy come out, any words of warning? Thanks
  8. J

    r1/r2 and ze dont measure up?

    ive just tested a 16a radial socket circuit. r1+r2 was 0.14 ze was 0.2 but measured zs was 0.74. am i right in thinking this is to high? why would i get this figure?
  9. G

    PV Guide.

    It's been posted a time or two, so thought I'd make it a 'sticky'.:)
  10. P

    Zs testing

    Just wondering if everyone actually does a Zs test when filling in a schedule of results. In the OSG it says that you can measure it or calculate it by addition. I appreciate the different value stuff, just thinking it is a lot easier and quicker to be adding 2 figures together than taking...
  11. V

    Testing limitations

    I cant do Ze because I can not turn off the power,it has to stay running 24/7, what do I do???
  12. B

    pfc testing

    can any body give me the reason why when testing pfc and pefc at a three phas DB why do you have to test all phases to neutral then all phases to earth why not just one phase surely there will be very similar results if not the same just thought iwould ask cause it was buggin me..
  13. H

    Is there any point testing earth loop impedance

    In a tt system? The earth spike is Reading greater than 50 ohms so clearly the mcbs won't make their rated disconnection times. Waste of time?
  14. M

    2391 verfying volt drop

    Hi Guys n Girls Sorry if im having a dumb momment but I have a practical 2391 exam in march and i cannot remember for certain how to verify Vd. Im assuming i can calculate the circuit length by taking the r1+r2 reading - then get the m'ohms per/m for both cables from the (OSG P166). Then...
  15. H

    using voltmeter

    What will happen if we use a voltmeter to measure current in a circuit. I mean if we connect our voltmeter leads at different points on current carraying wire/coil?
  16. T

    tray and conduit

    :) are there any sites out there showing how to fabricate cable tray/conduit as my nephew is keen to learn as he is starting college soon

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