testing

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  1. I

    Rcd testing

    Is a shower rcd, arranged ro the side of the ccu. What the correct procedure. I'm earth on earth bar, neutral on bottom left on rcd, and live on top mcb. The rcd is just tripping once, says trip on the megger. Should I do it inside the shower?
  2. C

    Electrical testing

    We are carrying out some electrical testing on an installation. From the fuse board it supplies 415v to a transformer which is stepped down to 230v. From there it is wired into a panel via 3 phases a neutral and an earth. When carrying out the Zs test we got 1.7 ohms on L1 and then 50 ohms on L2...
  3. Rocboni

    Transformer testing

    Hi All, So i was asked to look at at large 3 phase to 120V transformer around 85kVA - it was tripping the MCB instantly (it never used to) I insulation resistance tested the primary windings to earth - >2000ohms I continuity tested the windings and got 0.46 ohms per winding, they were all...
  4. K

    AM2 testing phase rotation

    doing my am2 this week and forgot to ask at my prep day about phase rotation, will I need to do it on the incoming supply also will I need to it anything else like the motor or three phase commando socket don't touch 3Phase a lot so abit unsure
  5. elliott194

    Testing Honda GX340 generator ignition coil

    Hello, can anyone give me advice on deciding whether this coil is good or not please? It’s quite rusty and I have no spark... The problem is I cannot find any resistance values for this model coil... The Honda part number is 30500-ze3-003 The primary windings were 0.25 Ohms, the secondary...
  6. Weezy

    UK Exceeding the max Ze in this situation still be considered to comply?

    If the max Ze for Tncs is 0.35 but you had a 1361 60amp fused isolator before the c.u with the 1361 having a max Zs of 0.56 (from the 80% chart) if the recorded reading at the c.u was let’s say 0.47 ohms would that now be considered to comply? i can’t see why it wouldn’t.
  7. timhoward

    Practical question about 3 phase IR testing

    Regarding 3 phase IR tests for initial verification, I'm wondering how people actually do it efficiently. GN3 says to IR test between all phase permutations, then: L1+L2+L3 connected together to N L1+L2+L3 connected together to E N to E The OSG further comments that if the group test to earth...
  8. M

    PFC Testing

    When testing PFC is it ever acceptable to test with Main Switch On, all MCBs On and from the Outgoing Side at DB. The methods I have seen instructed were with the supply isolated from the supply and on the Incoming Supply terminals, but was shown the way described in the first sentence by...
  9. M

    Polarity testing supply

    I'm probably missing something obvious here but if the polarity is reversed upstream of the cutout How are they getting 230v between N-E ? Surely they're still linked at the cutout ?
  10. M

    AM2 Functional Testing

    By what methods can you check functional testing during AM2. I am aware there are no loads attached i.e light bulbs, co2 dectector, motor so how will you check these operate when the switches/isolators are turned on/off. Or can functional testing just be checking the switches/isolators...
  11. M

    IR Testing DOL Motor

    When testing a DOL motor is the best method to disconnect the cables from MCB to DOL and connector block them. Then disconnect cables from DOL to Motor and connector block them and then IR both set of cables. Or would switching the isolator off and test from MCB to DOL then DOL to Motor without...
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