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| General Electrical Discussion All your electrical questions regarding electrics from within the United Kingdom. Anything that doesn't fit into any other forum that is electrical related can be posted in here. |
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03-10-2008
| #1 (permalink) |
| Member  Join Date: Aug 2008 Location: Wiltshire
Posts: 47
 |  Residual Current Hi all, working on a 500W halogen today (just went to change bulb for inept owner) and found that there was 3V on the terminals when disconnected via the MCB. Its a TNC-S with a ZE of 0.15 and a ZS of 0.96 on that circuit. Its controlled by an IP66 switch with no earth facility. Any idea's why that 3V is still sat their with it all turned off? |
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03-10-2008
| #2 (permalink) |
| Member Join Date: Mar 2008
Posts: 52
| Re: Residual Current Inductance from a live cable, running close and parallel for considerable length buried in wall somewhere? Similar thing with me today, TT system, 65V on cpc. Ze 6.4 ohms. But zero volts on met inside consumer unit. Cpc's were not connected at every terminal. |
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03-10-2008
| #3 (permalink) |
| Member Join Date: Aug 2008 Location: Wiltshire
Posts: 47
| Re: Residual Current Its all surface mounted and the cables that run alongside (2) are on the same circuit, which was off at the MCB. I must admit its had me baffled. I won't lose any sleep over it, 3v isn't much, I would just be facinated to know where it comes from as the only cables in the location are on the same circuit, which is switched off!!! Any more thoughts? |
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03-10-2008
| #4 (permalink) | |
| Respected Member  Join Date: Jan 2008 Location: Wirral
Posts: 573
| Re: Residual Current Quote:
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| Now is the hour that we must say good-bye, while I'm away oh please remember me   |
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04-10-2008
| #7 (permalink) |
| Member Join Date: Aug 2008 Location: Wiltshire
Posts: 47
| Re: Residual Current Could be any or all of above I suppose - but with 3V I'm not going to dwell on it too much. Re tested today with CU all off and no current was present at the halogen. Its sneaking through from somewhere when the whole installation is energised but its not doing any harm so will leave it. I could get the customer to pay me an arm and a leg to chase and rectify but I know they won't pay for it. Thanks all for your thoughts. |
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