measurement

measurement

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  1. ManPhan

    02 cable install in 01 MCT: please help me explain it

  2. R

    What would explain this strange measurement in the kitchen?

    In the breaker box of a 2010 house, there is a distinct 15A breaker for the garburator and distinct 15A breaker for the dishwasher. The garburator is powered only if the garburator breaker is on. But the line to the dishwasher is powered if EITHER the garburator breaker or dishwasher...
  3. K

    How do you calculate the tollerances from a 3 phase winding measurement

    Assuming that you measure the windings for a power transformer, for example: A-B: 2,258 ohms B-C: 2,262 ohms A-C: 2,250 ohms, how do you calculate the tolerances for these? What formula do you use? You consider as reference the highest or the lowest value from every 2 readings? I just wanna...
  4. cliffed

    Max Zs measurement allowed

    Any ideas on the Max Zs on a 3871 Type 3 13 amp MCB
  5. yogesh

    Measurement Accuracy of energy meter A44 ABB

    Please help resolve this techincal queistons: The customers industrial plant is supplied with electricity from the utility company via 2 transfer sta-tions. The sum of the 2 meters A44 from the transfer station deviates by more than 3% from the val-ues of the utility meter. The customeris...
  6. F

    MEASUREMENT OF LEAKAGE CURRENT

    I WAS ONCE SHOWN HOW TO CALCULATE INSULATION RESISTANCE USING A CLAMP METER. SO I NEED HELP AS IVE FORGOTTEN. CAN ANYONE HELP WITH THIS FOLLOWING FORMULA 230 + (20X10-6) = 11.5Mohms how have the arrived at this. A clamp meter has been clamped around live and neutral tails at the consumer and...
  7. P

    shading measurement app for android

    I am in the process of designing several small off-grid systems to be used in different remote locations. I need to be able to easily generate a shading profile on-site. I see references to phone based measuring apps such as "Solar Shading" by Comoving Magnetics but this seems to unavailable...
  8. J

    Loop impedance measurement

    Hi, All I have a megger LTW325 and fluke 1664FC to measure loop impedance by using high current mode. But both results are quite different. megger LTW325 is given a value 0.04ohms and fluke 1664fc is given a value 0.12 ohms. Means megger can give a current at 230V/0.04=5750A but fluke is only...
  9. Empire

    TT Zs measurement

    Morning all, I’m slightly confused with a submain TT out building radial extension. Earthing arrangement to property is TT outbuilding has its own local spike and 16mm to submain board. Zdb to local spike is 6.5 ohms Pssc of 4mm sub main feed 0.6 ohms r1+r2 of radial circuits is 0.3 ohms...
  10. T

    PFC measurement question

    Hi folks, I'm carrying out an EICR on a 3-Ph board which cannot be isolated fully - only certain circuits at certain times. Supply protected by 3x 88-2 fuses. When carrying out PSCC/PFC, I'm getting a small spark at the probe on the neutral bar/MET intermittently. Can anyone explain this? The...
  11. F

    Ze measurement with a PV system connected?

    Hi, I’m new to this site and wanted some advice on the following, I have a db with a 4kw PV system feed into it via a 16A cb. Gn3 tells me that a generating set which can feed in in parallel to a dB will effect the ze measurement. How can I carry out the ze, pefc and pssc test with this system...
  12. gazdkw82

    Minor works R1+R2 measurement

    I think I may have asked this question a while ago but not sure on what the answer was and it's come up again at our monthly tool box talk. When doing a Minor works for an additional spurred socket or extra light fitting on a circuit, should the R1+R2 measurement be taken from the protective...
  13. DeanoRN

    Hycontrol-level measurement industries.

    Hi all, Just a quick question i have been offered a job with a company called Hycontrol, has anyone got any experience with level and pressure management products and silo protection products? i cant find out much about this kind of industry. Ive been told it's quite a niche specialised...
  14. P

    Just joined, would like some advice on ELI measurement

    Hello everyone I'm not an electrician, but I was in the electrical business most of my working life before I retired. My background is electronics with the last few years working in industrial control systems - control engineering, etc - so I hope you will make allowances for me not being fully...
  15. T

    Ze at its Maximum Measurement

    If the Ze on a TNS supply is measured at 0.8ohms, is this still acceptable? Technically it is bang on the maximum. DB is 100A Main Switch with 30mA RCBO's on all circuits.
  16. soms

    Earth loop impedance measurement affected by dimmer switch

    Working on a job today which included a very simple new lighting circuit. The lighting circuit a very short run from a distribution board to a single switch position, which then supplies a single luminaire. The customer wanted a dimmer switch to control the fitting. To crack on and perform the...
  17. eckardt

    Show Your Test & Measurement Instruments

    Metrel MI 2077 TeraOhm 5 kV Chauvin Arnoux C.A 6410 Metrel MW9600 Metrel Eurotest 61557 - MI 2086 Metrel Test Leads
  18. M

    Zs Measurement on plug and play lighting

    Hi Everyone, Any advice on the following - Lighting circuit in a commercial installation (shop), Fixed wiring to Junction Box, The new light fittings are wired using 2.5mm plug and play flex's which are fed from the fixed wired jb's. Where shoul Zs be measured ? At the end of the fixed wiring ie...
  19. D

    PFC on EICR

    Came across a PFC result on an EICR today of 10KA. My meter is calibrated and I carry out monthly checks with a check box to ensure the on-going accuracy of the equipment and all tested fine up to today. Im not sure if I should quote my customer for C type R.C.B.Os with a higher breaking...
  20. Pete999

    Cable Length Measurement Avo CLM200

    Has anyone any experience in the use of an Avo CLM200 meter I have one but never really had the need to use it, can't even recall when I got it or how much it was (yes I'm a tool tart) before anyone starts.

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