Check the diagram for the DOL starter, they deliberately wired it L3-L2-L1 on the incoming side to the isolator and because the contactor is pre-wired, they swap it back to L1-L2-L3 between the bottom of the isolator to the top of the contactor
Don't forget the line conductor on the programmer between terminals 1 & 5. If you don't install it then the room stat won't work, it is shown on the diagram
Good video. What is the preferred method for terminating SY cable in an enclosure? Should the 2 brass washers be inside the enclosure or external? The reason I ask is that clamping the braids inside an enclosure can be tricky. Also would you confirm that colour identification is not required on black SY conductors as per BS7671? Numbering is allowed instead of colour identification. Also are the legs of the RFC required to be labelled/identified? If yes would one label them? Are the main protective bonding conductors required to be labelled inside the DB? Is it OK to ask the accessor to carry out the phase rotation test at the isolator before putting the cover on to conduct the Zs test? This would save some time as I would have to remove it again adter completing the Zs tests. Thanks
Can you confirm the switching of the light switch(s) is required for safe isolation or was that for insulation resistance testing? I take it learners have to do both single a 3 phase isolation procedures and are you suggesting they make learners do the lighting circuit as the 230v circuit to be isolated? Thanks Gaz
It's required for both. I was referring to when performing safe isolation, it's important we test both sides of the circuit to ensure it's just not switched off. Similarly with insulation resistance we have to test both side to ensure we have tested all cables in that install. They have to do 3 phase safe isolation in part A, then before live testing they have to perform 230v safe isolation on a lighting circuit and DOL. Great question Gaz. Does that help?
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Check the diagram for the DOL starter, they deliberately wired it L3-L2-L1 on the incoming side to the isolator and because the contactor is pre-wired, they swap it back to L1-L2-L3 between the bottom of the isolator to the top of the contactor
Don't forget the line conductor on the programmer between terminals 1 & 5. If you don't install it then the room stat won't work, it is shown on the diagram
Had AM2 last week...They asked me to lock off on the 3 pole isolator within the DB, so you prove dead on the load side, not the supply side
Thankyou. A simple exam made hard. Good advice
Good video. What is the preferred method for terminating SY cable in an enclosure? Should the 2 brass washers be inside the enclosure or external? The reason I ask is that clamping the braids inside an enclosure can be tricky. Also would you confirm that colour identification is not required on black SY conductors as per BS7671? Numbering is allowed instead of colour identification. Also are the legs of the RFC required to be labelled/identified? If yes would one label them? Are the main protective bonding conductors required to be labelled inside the DB? Is it OK to ask the accessor to carry out the phase rotation test at the isolator before putting the cover on to conduct the Zs test? This would save some time as I would have to remove it again adter completing the Zs tests. Thanks
Correction: in the video we mention a Main Circuit Breaker. This is the Main isolator.
Can you confirm the switching of the light switch(s) is required for safe isolation or was that for insulation resistance testing? I take it learners have to do both single a 3 phase isolation procedures and are you suggesting they make learners do the lighting circuit as the 230v circuit to be isolated? Thanks Gaz
It's required for both. I was referring to when performing safe isolation, it's important we test both sides of the circuit to ensure it's just not switched off. Similarly with insulation resistance we have to test both side to ensure we have tested all cables in that install. They have to do 3 phase safe isolation in part A, then before live testing they have to perform 230v safe isolation on a lighting circuit and DOL. Great question Gaz. Does that help?
Do you have to do safe isolation for both single and 3 phase on the AM2 or is it just one or the other? Thanks
Good videos Gaz, very helpful as easy to follow