2391 (R1+R2) 0n motor

Sparks74 · Mar 2, 2011

Guys i got my 2391 practical on friday & was wondering when R1+R2 on a 3 phase motor,
i would test seperatly across each line & cpc fromt he ccu to the supply side of the unit & then from the load side to the actual starter & the add the amounts together giving me 3 R1+R2 readings(1 for each phase)but as far as when i fill the schedule of tests sheets would i for example use the highest reading of the 3 or would i have to put in 1 for each phase therefore usung up 3 lines of the test sheet?

Also when doing an IR test on the motor circuit should i only test up to as far as the supply side of the contactor?

Many Thanks

DurhamSparky · Mar 2, 2011

why not just R2 the motor if its a radial circuit

thats what i did!!

yes up to contactor!

slocm3105 · Mar 5, 2011

Sparks74 said:
Guys i got my 2391 practical on friday & was wondering when R1+R2 on a 3 phase motor,
i would test seperatly across each line & cpc fromt he ccu to the supply side of the unit & then from the load side to the actual starter & the add the amounts together giving me 3 R1+R2 readings(1 for each phase)but as far as when i fill the schedule of tests sheets would i for example use the highest reading of the 3 or would i have to put in 1 for each phase therefore usung up 3 lines of the test sheet?

Test as you said and use all three values. Then record on test sheet as three separates readings on three separate lines as already mentioned.

Also when doing an IR test on the motor circuit should i only test up to as far as the supply side of the contactor?

Many Thanks

Test as you have said and yes you must fill out three separate results on the cert as to cover all three lines.