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 Post subject: help with testing
PostPosted: Tue Mar 28, 2006 3:04 pm 
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:oops: I have my dad's electrical test equipment left to me, I'd like to test my house using these, but what is a good reading and what is a bad reading, I have been looking for guidance on these tests but can not find any litriture on the result's,
I want to do the insulation, continuety, rcd, earth loop impeadence
I know that the insulation should be as close to infinity as possible, but whaen testing at 500v what is the iee regulations guide line?
any help would be apreciated,
oh.. ps
the reason for me testing is to determin as to wether wee need a rewire, it all look fairly new ish, we have a 10 way split consumer unit, H did have a problem with a damp socket that I had sorted, but would like to test my home. :wink:


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PostPosted: Thu Mar 30, 2006 12:22 am 
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Insulation testing is done at 500v and continuity is done at 230v for starters.

For insulation testing it set very generously at 0.5 megaohms and continuity will vary depending on length of circuit.

RCD tests at 30ma at x1 should not exceed any more than 200ms and 40 ms at x5. This should be done at the end of each radial circuit, (lighting shower etc)

And the same applies for impedance tests. The end of each circuit to optain the highest reading. This should be as close to zero as possible.

Hope this helps!


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 Post subject: help with testing,
PostPosted: Thu Mar 30, 2006 1:07 pm 
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thank you for your help, it seems I have a few problems with the insulation test as the reading is over 2 meg ohms on my ring main, with everything disconnected to it removed,
cheers
Lee


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 Post subject: Re: help with testing,
PostPosted: Fri Mar 31, 2006 3:38 am 
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leedavies wrote:
thank you for your help, it seems I have a few problems with the insulation test as the reading is over 2 meg ohms on my ring main, with everything disconnected to it removed,
cheers
Lee


The chances are there is something still left plugged in or switched on. Heating timeclocks and boilers are the most common things to be forgotten about :wink:


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 Post subject: testing testing 123
PostPosted: Fri Mar 31, 2006 10:43 am 
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nope, disconnected the boiler, and water tank heater off,


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PostPosted: Fri Mar 31, 2006 10:31 pm 
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No outside lights or wall lights coming off the ring main by any chance? :?


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PostPosted: Sat Apr 01, 2006 5:29 am 
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hi, no o/s lighting, I did have a problem with a damp socket a while ago, but that socket is dry now, I must have a bit of wet in there somewhere.
the ring main only supplies the sockets, one ring for up stairs, one for down, and another one for the kitchen, it is the downstairs ring (but not the one that suplies the kitchen) that has the adverse reading.
and is also the same circuit that had the damp socket, I have checked the location of all of the shelves and pictures and there is nothing directly above any of the sockets, so there should be nothing attatched to the walls that would have hit a cable, I'm wondering if the installers may have trapped a cable and over the years the cable has started to disintergrate.. (excuse the spelling). the rcd does trip now and again, but then common sence tends to tell you that the last thing you plugged in is the problem, but it has happened with just the tv on, or the tv on, the iron on, and so on, it is not an item specific fault. tomorrow i will take all the sockets off the ring and seperate the cables/ wires and search for the dodgy wire and get back to you.


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PostPosted: Sat Apr 01, 2006 12:18 pm 
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Sorry to be patronising but when you tested the cables did you remove the neutrals from the terminals in the consumer unit?


Even with the lives disconnected and with neutrals connected you can still get parallel readings from other circuits!


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 Post subject: still testing
PostPosted: Sat Apr 01, 2006 1:52 pm 
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don't worry, ur not patronising..lol.
took lives and neutrals and earht out of consumer unit, there is one side that is down, I have now found the problem, a squashed cable running between 2 sockets, cable crushed when the plumber put some boards back, rectified with a junction box.
thank you for your hel
:lol:


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PostPosted: Sat Apr 01, 2006 4:43 pm 
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Well done! :wink:


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