- Joined
- 7 Oct 2003
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Hi again,
I'd been doing some work on the ring main and before I reconnected the socket I'd been working on I thought I'd check the continuity between L&L and N&N wires to check there wasn't a break anywhere else in the system. This was fine. However I also checked the resistance between the L&E conductors. This revealed a resistance of 19 ohms, somewhat less than I was expecting.
Going around the house unplugging things appeared to indicate that a small freezer was the culprit. On unplugging it the L-E reistance when open circuit ish (unsteady readings kohm range).
(everything else unplugged/switched off by this stage)
I unplugged the freezer and measured the resistances accross the plug terminals. L-E was open circuit, L-N was 19 ohms. N-E was open circuit.
This made me think that there was maybe a fault with that socket so I plugged a lamp into it expecting to see a L-E resitance of70 ohms but instead was still open circuit.
Plugged freezer into different socket L-E open circuit.
Now confused! I appear to have a fault that only occurs with one socket/appliance combination.
Ran out of time to investigate further (complaints about lack of TV etc)
When I re-connected the ring and put the fuse back in I got a reading of about 0.5V between L&E.
Am I missing something. Presumably I wouldn’t expect 19 ohms between L&E.
Any suggestions as to what maybe wrong or what to try next. I was thinking of measuring the current in the earth conductor by connecting meter in series at the cu just to confirm if I really have a problem.
Jim
I'd been doing some work on the ring main and before I reconnected the socket I'd been working on I thought I'd check the continuity between L&L and N&N wires to check there wasn't a break anywhere else in the system. This was fine. However I also checked the resistance between the L&E conductors. This revealed a resistance of 19 ohms, somewhat less than I was expecting.
Going around the house unplugging things appeared to indicate that a small freezer was the culprit. On unplugging it the L-E reistance when open circuit ish (unsteady readings kohm range).
(everything else unplugged/switched off by this stage)
I unplugged the freezer and measured the resistances accross the plug terminals. L-E was open circuit, L-N was 19 ohms. N-E was open circuit.
This made me think that there was maybe a fault with that socket so I plugged a lamp into it expecting to see a L-E resitance of70 ohms but instead was still open circuit.
Plugged freezer into different socket L-E open circuit.
Now confused! I appear to have a fault that only occurs with one socket/appliance combination.
Ran out of time to investigate further (complaints about lack of TV etc)
When I re-connected the ring and put the fuse back in I got a reading of about 0.5V between L&E.
Am I missing something. Presumably I wouldn’t expect 19 ohms between L&E.
Any suggestions as to what maybe wrong or what to try next. I was thinking of measuring the current in the earth conductor by connecting meter in series at the cu just to confirm if I really have a problem.
Jim