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Student & Learning Zone - City & Guilds
2391 practical
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<blockquote data-quote="the doctor" data-source="post: 80880" data-attributes="member: 75"><p>hi</p><p></p><p>the "big rig" is a periodic, so you can test in any order you like......now the easiest way is this:</p><p></p><p>1 incoming polarity test and safe isolation</p><p></p><p>2 Ze</p><p></p><p>3 pfc</p><p></p><p>4 R1+R2 all the radials on the 3 phase board( to do 3 phase socket, push contactor in with screwdriver)</p><p></p><p>5 R1+R2 the ring</p><p></p><p>(add R1+R2s to Ze to get circuit Zs results)</p><p></p><p>6 Do IR test on 3 phase board not forgetting to test at the 3 phase socket "backwards" to starter</p><p></p><p>7 transfer Zs of sub main to become Zdb of 1 phase board.</p><p></p><p>8 Do R1+R2s of radial circuits on little board</p><p></p><p>( add these to your previously obtained Zdb figure to get final Zs figs)</p><p></p><p>9 Do IR on little board not forgetting to work 2-way switching</p><p></p><p>10 ask examiner can you power up and then do RCD trip times not forgetting final button test</p><p></p><p>Does this help you out OP?</p></blockquote><p></p>
[QUOTE="the doctor, post: 80880, member: 75"] hi the "big rig" is a periodic, so you can test in any order you like......now the easiest way is this: 1 incoming polarity test and safe isolation 2 Ze 3 pfc 4 R1+R2 all the radials on the 3 phase board( to do 3 phase socket, push contactor in with screwdriver) 5 R1+R2 the ring (add R1+R2s to Ze to get circuit Zs results) 6 Do IR test on 3 phase board not forgetting to test at the 3 phase socket "backwards" to starter 7 transfer Zs of sub main to become Zdb of 1 phase board. 8 Do R1+R2s of radial circuits on little board ( add these to your previously obtained Zdb figure to get final Zs figs) 9 Do IR on little board not forgetting to work 2-way switching 10 ask examiner can you power up and then do RCD trip times not forgetting final button test Does this help you out OP? [/QUOTE]
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