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18th Edition amendment one. Volt drop measurement, who is spreading the rumour we need new testers?

Sparkingchip
Who is the test equipment manufacturer and/ or importer spreading the rumour that we will need new volt drop testers?


Out of interest I have tried an internet search for volt drop testers than can be used to test UK fixed installations and drew a blank with only testers suitable for use in the USA at lower voltages coming up in the search results along with results for auto electrics.


Andy
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  • 0
    Oh dearie me!


    You certainly don't need a new tester, but the Martindale mentioned above makes it easy by storing the data and doing the maths for you.


    18th Edn says little: check it by measurement or calculation (643.11).


    17th Edn said more inasmuch as it said how to measure or calculate (612.14).


    To remind you, VD is measured by measuring R1 and Rn, and then multiplying their sum by In. If it is inconvenient to disconnect the circuit, you can measure its impedance (using your EFLI tester) at the end of the circuit and subtract the impedance at the origin. You will have done the PSSC at the DB, so you just need to note the impedance and take it again at the end of the circuit. So no new testers required! ?
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  • 0
    Oh dearie me!


    You certainly don't need a new tester, but the Martindale mentioned above makes it easy by storing the data and doing the maths for you.


    18th Edn says little: check it by measurement or calculation (643.11).


    17th Edn said more inasmuch as it said how to measure or calculate (612.14).


    To remind you, VD is measured by measuring R1 and Rn, and then multiplying their sum by In. If it is inconvenient to disconnect the circuit, you can measure its impedance (using your EFLI tester) at the end of the circuit and subtract the impedance at the origin. You will have done the PSSC at the DB, so you just need to note the impedance and take it again at the end of the circuit. So no new testers required! ?
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