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Topic Title: Grometts for old conduit
Topic Summary: Where can you get them?
Created On: 22 May 2007 10:16 PM
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 22 May 2007 10:16 PM
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naughtymoose

Posts: 456
Joined: 26 June 2006

Do they still make rubber end caps to go over the old metal conduit used for switch drops? I'm rewiring a house this week and will be able to re-use the existing switch drop pipes.

However, the nice little push on rubber thingies have all perished. I've tried gromett edging strip, but it isn't pliable enough.

Help!

Please?
 22 May 2007 10:24 PM
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normcall

Posts: 8119
Joined: 15 January 2005

Not seen any for many a year.
I usually push cable in gently and leave a nice slack loop so the edges are as far as possible from those razor sharp ends. Best I can do, but if possible and accessable, a dab of mastic will hold it clear.

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Norman
 22 May 2007 10:26 PM
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naughtymoose

Posts: 456
Joined: 26 June 2006

Norm

I was sure that if you could still get such things, you would be the man to tell me!

Never mind. Your suggestion to use a bit of silicon is the solution.

many thanks

Colin
 22 May 2007 10:29 PM
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truss

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Joined: 27 March 2005

While we're on the subject is there a requirement to earth the switch drop pipes?

Regards,

Trussy
 22 May 2007 10:58 PM
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TBT

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It could be argued that a steel conduit drop might be required to be earthed (522-06-06).
 23 May 2007 06:49 AM
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normcall

Posts: 8119
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It should be, but the real world usually means that they can't be.
I'm still glad I'm not perfect - unlike some on this forum.

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Norman
 23 May 2007 07:59 AM
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deleted_nonsparky

Posts: 1962
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Are these suitable?

-------------------------

I don't suffer from stress - I'm a carrier...

 23 May 2007 08:16 AM
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khales

Posts: 1271
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IMHO: provided that the metal 'switch drop pipes' are in the 'safe' zones; i.e. they are not being used as earthed conduit to provide protection for cables being run outside the 'safe' zones, and you are using sheathed cables, then they are metal ducts in teh building structure, not electrical conduit, and therefore are not required to be earthed.

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khales
 23 May 2007 08:27 AM
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normcall

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NS - many domestic metal switch drops are either oval or 5/8 as you know and I suspect the ones you found are for metric round (no size is given).

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Norman
 23 May 2007 05:24 PM
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lawrmc

Posts: 125
Joined: 20 March 2006

Originally posted by: naughtymoose

Do they still make rubber end caps to go over the old metal conduit used for switch drops? I'm rewiring a house this week and will be able to re-use the existing switch drop pipes.



However, the nice little push on rubber thingies have all perished. I've tried gromett edging strip, but it isn't pliable enough.



Help!



Please?


CEF, just used a bag of on a re-wire, 20mm black rubber conduit bushes.
 23 May 2007 09:00 PM
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naughtymoose

Posts: 456
Joined: 26 June 2006

Thanks for the replies.

NS: as Norm says, they look like they would be suitable for standard metal conduit however, these things are oval.

Anyway, I spoke to the nice chaps at CablePlus in Brentwood. They sent me a length of squishy rubbery stuff made by Greenbrook. It looks like it will be the solution. I will report back when completed.
 23 May 2007 10:36 PM
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AJJewsbury

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While we're on the subject is there a requirement to earth the switch drop pipes?

This question has come up a few times. I think we're all agreed that when a conduit contains cables with only basic insulation (i.e. unsheathed singles) that it's an exposed-condutive-part and so needs to be earthed.

There has been a debate however on what happens when a conduit contains sheathed cables however. Some say that the sheath makes the cables equivalent to class II (see reg 471-09-04) so the conduit doesn't need to be earthed; others say that it still could be make live by a fault and so needs earthing (a sheath doesn't really make a cable class II).

The recently published GN8 (on page 151, section 10.12) discusses this problem, but from the point of view of trunking and cable basket rather than conduit, and seems to conclude that sheathed cables are equivalent to Class II and that in that situation the trunking/basket should not be earthed. (But it may need to be bonded, if is could introduce a potential from outside the location.) Can anyone see why the same logic should not apply to conduit?

- Andy.
 23 May 2007 10:43 PM
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stateit

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...excepting the cases where conduit is used as the cpc...

-------------------------
S George
http://www.sg-electrical.com
 24 May 2007 12:27 AM
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AJJewsbury

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OK - I'll give you that one! ;-)

- Andy.
 01 May 2013 03:44 PM
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dbirtles

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Greenbrook Electrical do them under the Norslo range suitable for 16mm 20mm and 25mm .These fit on the tops of conduits and the rubber keeps the sharp edges of the cables,just like the old ones you come accross.
 01 May 2013 06:35 PM
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DOUGIE1000

Posts: 4163
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I too have them from greenbrook.

-------------------------
Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
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