Hi Guys,
I wounder if i could pick your brains? you all seem very helpful on this forum.
Im in the middle of C&G 2391 so please dont shoot me down if iv made a mistake.
Iv just bought a Megger tester 1552 so thought I would start getting to grips with it and test the house im renting at the moment. Everything was good until i measured the Zs which i first did with the socket connection provided, which came out high at 2.40. Now this is a TN-S system and i was testing a ring main with 30A BS3871 type 2 fuse. Iv checked the OSG page 92 table 2D and the reading should be within 0.91, so i thought i might be using the equipment wrong so also tested it at the supply and yes i did turn the supply off before disconnecting the earth and checked leads and with known source to prove safe isolation.I then connect the earth and test lead before powering up But when i try to test for Zs with the leads to the cpc and phase the megger does not start up so i take it its not making a circuit? I checked the earth from the supply which i did first before anything and its 16mm2 as it should be, could it be the clamp to the supply thats got a bad connection if any? And if so i would like to get this sorted straight away, so would i have to contacted my supplier as its there responsibility?
Like i say i could be totaly wrong in what im doing but if you dont ask
Thanks guys sorry its a bit long winded, please if im going wrong with the test shoot away
I wounder if i could pick your brains? you all seem very helpful on this forum.
Im in the middle of C&G 2391 so please dont shoot me down if iv made a mistake.
Iv just bought a Megger tester 1552 so thought I would start getting to grips with it and test the house im renting at the moment. Everything was good until i measured the Zs which i first did with the socket connection provided, which came out high at 2.40. Now this is a TN-S system and i was testing a ring main with 30A BS3871 type 2 fuse. Iv checked the OSG page 92 table 2D and the reading should be within 0.91, so i thought i might be using the equipment wrong so also tested it at the supply and yes i did turn the supply off before disconnecting the earth and checked leads and with known source to prove safe isolation.I then connect the earth and test lead before powering up But when i try to test for Zs with the leads to the cpc and phase the megger does not start up so i take it its not making a circuit? I checked the earth from the supply which i did first before anything and its 16mm2 as it should be, could it be the clamp to the supply thats got a bad connection if any? And if so i would like to get this sorted straight away, so would i have to contacted my supplier as its there responsibility?
Like i say i could be totaly wrong in what im doing but if you dont ask
Thanks guys sorry its a bit long winded, please if im going wrong with the test shoot away