Link between N - CPC on fluorescent... what is it?

[NDG Elecs]

Hello folks,

I hope the picture shows ok. If it does not show, then basically there is a blue disc approx 25mm in diameter that may have a resistor or something in it. It is approx 4mm ' thick'.

The blue disc is linking between neutral and earth on the fitting. Never noticed these before and the casing of the fitting is live when energised, which is not good!

Fluorescent's puzzle me at the best of times!

Thanks.

 

[Clive P]

Hi,

Maybe my eyesight, but is that a brown ( live ) cable connected into the Neutral terminal. Hard to determine without seeing the full picture of the fluorescent wiring, and yes; the capacitor should be L-N.

Regards.

 

[guest119]

it is connected...the earth tag is at the bottom of the connector block...as is the twin`s CPC...

Yep, earth is connected at the bottom, only from what I can see.
Snipped off at the top?
But earth was lost at the switch anyway.

Boydy

 

[nickblake]

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[NDG Elecs]

Thanks for all responses folks.

The CPC is connected and the live does not go into the neutral. The other twin is looping to another florry.

The fittings are cheap and the trunking work is the worst I have ever seen. Apparently the, ahem, 'spark', ahem, that installed it disappeared midway through the rewire around four years ago.

The fitting is only live when switched.

I do recall something now from college a few years back about PF correction when I think about it.

Thanks again one and all.

 

[guest119]

Have you checked from n to a genuine earth for voltage anywhere in the install?

Boydy

 

[NDG Elecs]

Hi Boydy,

The install is TT with Ra of nigh on 60 ohms. Was not really expecting a PD of 230V between rod and neutral. Maybe the fault is L-CPC rather than N-CPC. Need to investigate further, though I think the client prob thinks I am spinning them a yarn as only went there to fit an extra light fitting. Now they need a new earth and RCD protection!

I left the circuit isolated and will ring them tomorrow to see whats what!

in answer to your qu I have checked some Zs's out of curiosity on other circuits, and they are all around 20 ohms with water bond in place (no gas there). So the earth is not the best at present.... but did not check other circuits for N-CPC voltage, no.

 

[Geordie Spark]

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What the Hell's a big **** off waterfall got to do with the price of cheese??

 

[guest119]

Hi Boydy,

The install is TT with Ra of nigh on 60 ohms. Was not really expecting a PD of 230V between rod and neutral. Maybe the fault is L-CPC rather than N-CPC. Need to investigate further, though I think the client prob thinks I am spinning them a yarn as only went there to fit an extra light fitting. Now they need a new earth and RCD protection!

I left the circuit isolated and will ring them tomorrow to see whats what!

in answer to your qu I have checked some Zs's out of curiosity on other circuits, and they are all around 20 ohms with water bond in place (no gas there). So the earth is not the best at present.... but did not check other circuits for N-CPC voltage, no.

Let us know what you find Bud.

Boydy