line voltage phase voltage tests safe isolation three phase

spokes

hello friends.
#
I have a test at college tomorow on safe isolation on a three phase supply

I know how to safely isolate the TPN as far as locking off etc

but i am still confused about how to test that the circuit is dead
line voltage
and phase voltage tests

i cannot afford to fail this one....

hope this makes sense...

use a voltage indicator that complies with gs 38.

visually inspect it, test on known voltage source, test dead

E-N, E-L1, E-L2, E-L3, N-L1, N-L2, N-L3, L1-L2, L1-L3, L2-L3.

re test voltage indicator to prove still working on known voltage

line voltage is the voltage when you test between any of the phases and earth.

Phase voltage is the voltage between any two of the phases.

The procedure for isolation is to test your testers on a known live source or proving unit.

Test the circuit you wish to isolate is live.

Isolate this circuit and lock it off etc.

Test between every live and earth and also live to live. (Live includes the neutral)

Job done

A lot clearer now
hopefuly i remember this lol

good luck for me tomorow.......

glad i found this site // you may be hearing from me soon

just one more thing sorry.... i should know but cant remember
which one is 600 and 200 ?

RF Lighting said:
line voltage is the voltage when you test between any of the phases and earth.

Phase voltage is the voltage between any two of the phases.

Wrong way round

spokes wrote

but which one is 600 and 200 ?

? 600 and 200 what? volts?

if so each phase to earth or nuetral is 230 volts (+10/-6%) and phase-phase is 400 volts ( give or take again)

stated voltages from the supplier are 230 and 400 volts but they are aloud a tolerance of +10% or -6% so the voltages you may measure in the future should fall in this range.

sorry yes that is what i meant.
200 and 400 volts

thanks for help mate ....

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