Insulating around the supply cable
Following the recent thread about cables passing through insulation it has left me with a dilemma regards the supply cable.
My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Originally, I was simply going to PU foam the gap but the previous thread has made me a bit cautious. I could possibly get some of that flexible corrugated sleeving and split it along its length to get it around the cable but suspect there would be gaps at the bends allowing PU in against the cable. To my mind the gap in insulation is too great to ignore so I would welcome any advice please. Richard |
Insulating around the supply cable
On Monday, 12 October 2020 09:51:58 UTC+1, Tricky Dicky wrote:
My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Move the cutout? :-) Just squirty foam it and say it was like that when you moved in. Owain |
Insulating around the supply cable
On 12 Oct 2020 at 09:51:55 BST, "Tricky Dicky" wrote:
Following the recent thread about cables passing through insulation it has left me with a dilemma regards the supply cable. My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Originally, I was simply going to PU foam the gap but the previous thread has made me a bit cautious. I could possibly get some of that flexible corrugated sleeving and split it along its length to get it around the cable but suspect there would be gaps at the bends allowing PU in against the cable. To my mind the gap in insulation is too great to ignore so I would welcome any advice please. Richard Are you worried about insulation derating the cable or chemical effects on the cable jacket? I must admit I would assume in both cases it is designed to go in some unpredictable unsavoury places and would be ok. But I have no basis for saying that. -- Roger Hayter |
Insulating around the supply cable
On Monday, 12 October 2020 at 11:08:01 UTC+1, Roger Hayter wrote:
On 12 Oct 2020 at 09:51:55 BST, "Tricky Dicky" wrote: Are you worried about insulation derating the cable or chemical effects on the cable jacket? I must admit I would assume in both cases it is designed to go in some unpredictable unsavoury places and would be ok. But I have no basis for saying that. -- Roger Hayter Roger it is about derating the cable, I know the PU should not react with the cable. Previously it was buried maybe not intentionally in a thick lump of plaster which fell away when I pulled the old floorboards out and was finally able to see the situation. Owain, I take it from the smiley moving the cutout was not a serious suggestion, apart from involving the DNO again there is nowhere for it to go things are very tight around that area with the CU and meters. Richard |
Insulating around the supply cable
On 12/10/2020 09:51, Tricky Dicky wrote:
Following the recent thread about cables passing through insulation it has left me with a dilemma regards the supply cable. My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Originally, I was simply going to PU foam the gap but the previous thread has made me a bit cautious. I could possibly get some of that flexible corrugated sleeving and split it along its length to get it around the cable but suspect there would be gaps at the bends allowing PU in against the cable. To my mind the gap in insulation is too great to ignore so I would welcome any advice please. Richard foam doesn't affect the wiring chemically but the insulation may cause overheating in some home wiring cases. I doubt this is relevant for a short run of armoured or 100A tails. -- "Nature does not give up the winter because people dislike the cold." ۥ Confucius |
Insulating around the supply cable
On 12/10/2020 11:23, Tricky Dicky wrote:
On Monday, 12 October 2020 at 11:08:01 UTC+1, Roger Hayter wrote: On 12 Oct 2020 at 09:51:55 BST, "Tricky Dicky" wrote: Are you worried about insulation derating the cable or chemical effects on the cable jacket? I must admit I would assume in both cases it is designed to go in some unpredictable unsavoury places and would be ok. But I have no basis for saying that. -- Roger Hayter Roger it is about derating the cable, I know the PU should not react with the cable. Previously it was buried maybe not intentionally in a thick lump of plaster which fell away when I pulled the old floorboards out and was finally able to see the situation. Owain, I take it from the smiley moving the cutout was not a serious suggestion, apart from involving the DNO again there is nowhere for it to go things are very tight around that area with the CU and meters. Richard A foot of foam on a meter of fat copper cable is not going to derate anything significantly. Copper conducts heat damned well I am fairly sure my armoured incoming comes up a foam filled pipe... -- To ban Christmas, simply give turkeys the vote. |
Insulating around the supply cable
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Insulating around the supply cable
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Insulating around the supply cable
On Monday, 12 October 2020 11:23:26 UTC+1, Tricky Dicky wrote:
things are very tight around that area with the CU and meters. You can move them too :-) Owain |
Insulating around the supply cable
I'd seriously doubt foam there on a short run of cable would make any
difference at all, indeed because its quite easy to dig out one would not really have aan issue to get at the cable. Brian -- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! wrote in message ... On Monday, 12 October 2020 09:51:58 UTC+1, Tricky Dicky wrote: My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Move the cutout? :-) Just squirty foam it and say it was like that when you moved in. Owain |
Insulating around the supply cable
On Tuesday, 13 October 2020 at 07:56:31 UTC+1, Brian Gaff (Sofa) wrote:
I'd seriously doubt foam there on a short run of cable would make any difference at all, indeed because its quite easy to dig out one would not really have aan issue to get at the cable. Brian -- -- This newsgroup posting comes to you directly from... The Sofa of Brian Gaff... Blind user, so no pictures please Note this Signature is meaningless.! wrote in message ... On Monday, 12 October 2020 09:51:58 UTC+1, Tricky Dicky wrote: My supply cable emerges out of the sub-floor and passes through an approx. 50mm gap between the first joist and the wall. However the run of the cable is not vertical due to the alignment between the entry point and the cutout the alignment is approx. 150 - 200mm out and the result is that the cable forms a lazy S in the space between joist and wall. This makes sleeving impossible. Move the cutout? :-) Just squirty foam it and say it was like that when you moved in. Owain The latest, straight from the horses mouth, I got in touch with the DNO and their advice is not to use PU foam around the supply cable. So I will stuff the gap with some Rockwool on one side and I can get a bit of wood down the other side so I can fill that with PU and then a bit of judicious use of sealing tape should leave it insulated as best can and as air tight as possible. Thanks for all the suggestions. Richard |
Insulating around the supply cable
On Tuesday, 13 October 2020 15:52:03 UTC+1, Tricky Dicky wrote:
The latest, straight from the horses mouth, I got in touch with the DNO and their advice is not to use PU foam around the supply cable. ooops. Owain |
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