S/Lights and Pilot wiring

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#109871 - 12/26/05 02:13 AM

S/Lights and Pilot wiring

Trumpy

Member

Joined: Jul 2002
Posts: 8,217
SI,New Zealand

Photo's and information submitted by RODALCO:

Quote

These first two pics were from a streetlight pole in Kelston which supplies a bus-stop also, it was not working so I had to pull all these wires out of the pole to do some checks. Earth wire was not connected as you can see the cut lug which was supposed to sit under a loose stud in the pole. Final result was wiring ok. just a blown fuse in lighting armature bus-stop. good checking from whoever looks after those bus-shelters.
they blamed a cable fault in the TPS.

Quote

The next 3 pics are from HW (hot water) pilot fuses on a piece of cardboard in a transformer in Beach Haven. After an HT fault I had to backfeed the LT side, remove the jumpers from the LT bushings to get the power back on.
Probably about 20 years ago, whoever did the job made an attempt to affix the fuses. The card board is just about to fall apart.
Very often pilot fuses are just laying on the bottom of the TX.

The jumpers are visible at the bottom, green 70 mm² earth wire with coloured tape on it.

Thanks a heap Ray!. [Linked Image]

Let's face it, these days if you're not young, you're old - Red Green

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#109872 - 12/26/05 02:21 AM

Re: S/Lights and Pilot wiring

Trumpy

Member

Joined: Jul 2002
Posts: 8,217
SI,New Zealand

BTW Ray,
Just looking at that third picture.
Is that a split in the insulation on that red phase wire?.

Let's face it, these days if you're not young, you're old - Red Green

#109873 - 12/26/05 05:27 AM

Re: S/Lights and Pilot wiring

RODALCO

Member

Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand

Well spotted, yes there is a cut in the insulation of that red cable.

Thanks for posting my photo's. I will keep my camera handy while doing my jobs all over the place.

The product of rotation, excitation and flux produces electricty.

#109874 - 01/01/06 06:30 AM

Re: S/Lights and Pilot wiring

Arend

Member

Joined: May 2004
Posts: 19
Joure, Friesland, The Netherla...

Very interesting photo's.

What does HT, LT and TSP exactly mean?

Thanks,

Arend

bzzzzt ;-)

#109875 - 01/01/06 09:36 PM

Re: S/Lights and Pilot wiring

RODALCO

Member

Joined: Dec 2005
Posts: 854
Titirangi, Akld, New Zealand

[quote]What does HT, LT and TSP exactly mean?[/qoute]

Hi Arend:

HT High Tension, usually 11000 Volts.
LT Low Tension, 230 / 400 Volts.
TPS Tough plasic sheethed. That's the white cable used in wiring up houses, in this case 3 core: Red, Ø. Black, N. Green, Earth. ( not supposed to be used for streetlights unless in conduit.) [Linked Image]

For streetlights nowadays 6 or 10mm² Cu Neutral screened cable is used. Previously 4 mm² single core with single thick or double layers of insulation was used.

I make you a close up photo.

The product of rotation, excitation and flux produces electricty.

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