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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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DIY: Separating mains and low voltage cables in trunking
I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within?
Richard |
#2
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DIY: Separating mains and low voltage cables in trunking
Tricky Dicky wrote:
I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Richard I could be wrong but had always assumed the requirement was based on the need for separation between power and data to reduce interference/inductive/capacitive coupling. Putting trunking within trunking might increase the electrical insulation but the mains cable itself should have more than adequate insulation anyway. |
#3
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DIY: Separating mains and low voltage cables in trunking
Tricky Dicky wrote:
I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? If you don't want to use the larger dado trunking, can't see why trunking within trunking wouldn't be acceptable. |
#4
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DIY: Separating mains and low voltage cables in trunking
Bob Minchin formulated the question :
I could be wrong but had always assumed the requirement was based on the need for separation between power and data to reduce interference/inductive/capacitive coupling. IEE Regs do not care about that, but it states something about the insulation of the lower voltage cables has to be to mains spec.. Data cables are not rated for mains voltages, so there has to be some sort of physical barrier separating them. I would imagine that the data cable in its own trunking would be OK. |
#5
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Separating mains and low voltage cables in trunking
Personally I'd not want to get data cables anywhere near long runs of mains
wiring due to inductive effects that might affect their efficiency. 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.! "Tricky Dicky" wrote in message ... I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Richard |
#6
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DIY: Separating mains and low voltage cables in trunking
On 26/10/18 16:36, Tricky Dicky wrote:
I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Richard I see no problem with that. |
#7
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DIY: Separating mains and low voltage cables in trunking
On 26/10/18 16:47, Bob Minchin wrote:
Tricky Dicky wrote: I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Richard I could be wrong but had always assumed the requirement was based on the need for separation between power and data to reduce interference/inductive/capacitive coupling. Putting trunking within trunking might increase the electrical insulation but the mains cable itself should have more than adequate insulation anyway. The IET regs IIRC say that you can put ELV (what normal people call low voltage, the IET calls extra low voltage) cables in the same containment as LV (mains) if all the cables' insulation is rated for the highest voltage present. |
#9
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DIY: Separating mains and low voltage cables in trunking
On 26/10/2018 16:47, Bob Minchin wrote:
Tricky Dicky wrote: I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Richard I could be wrong but had always assumed the requirement was based on the need for separation between power and data to reduce interference/inductive/capacitive coupling. Putting trunking within trunking might increase the electrical insulation but the mains cable itself should have more than adequate insulation anyway. No. IIRC the whole idea was to put AT LESAST two layers of insulation between mains and datas. Trunking need not carry T & E - it can carry solid core mains in single conductors. Again the whole idea is to prevent shock from the data wiring should it all chafe through. -- "If you dont read the news paper, you are un-informed. If you read the news paper, you are mis-informed." Mark Twain |
#10
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DIY: Separating mains and low voltage cables in trunking
On 26/10/2018 19:07, Harry Bloomfield wrote:
Bob Minchin formulated the question : I could be wrong but had always assumed the requirement was based on the need for separation between power and data to reduce interference/inductive/capacitive coupling. IEE Regs do not care about that, but it states something about the insulation of the lower voltage cables has to be to mains spec.. Data cables are not rated for mains voltages, so there has to be some sort of physical barrier separating them. I would imagine that the data cable in its own trunking would be OK. That is a beter explantion of what I understand to be the case, than mine. +1 -- "If you dont read the news paper, you are un-informed. If you read the news paper, you are mis-informed." Mark Twain |
#11
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DIY: Separating mains and low voltage cables in trunking
On Fri, 26 Oct 2018 08:36:25 -0700 (PDT), Tricky Dicky wrote:
I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Can't see anything wrong with that as far as electrical safety is concerned. I'd be a bit more worried about common mode induction from the mains into the Cate5e. What are the Cat5e's going to be used for? -- Cheers Dave. |
#12
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DIY: Separating mains and low voltage cables in trunking
On 27/10/18 09:45, Dave Liquorice wrote:
On Fri, 26 Oct 2018 08:36:25 -0700 (PDT), Tricky Dicky wrote: I am looking to use some 50mm X 50mm trunking around the garage to take mains wiring. I would also like to run some Cat5e cables in the trunking but I cannot find any that will take a separator and was wondering if it was acceptable to install smaller trunking within the larger one and enclose the low voltage cables within? Can't see anything wrong with that as far as electrical safety is concerned. I'd be a bit more worried about common mode induction from the mains into the Cate5e. What are the Cat5e's going to be used for? Granted they were not long straight parallel runs, but if the Cat5e is being used for ethernet, you'd have to try hard to break it - I've seen Cat5e piled on high current mains cables (from 32A flex to large SWA) under computer room floors and never a problem at gigabit speeds - the twisted pair balanced approach works very well. And there is magnetic isolation at both ends no common mode rejection is pretty solid. |
#13
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DIY: Separating mains and low voltage cables in trunking
Just to clarify some points. 50 X 50 trunking is chosen because the plan is to drop cables from the trunking at ceiling level in conduit to sockets and switches and that size is convenient to work with when it comes to joining conduit to trunking.
The Cat5e will mainly be to connect to CCTV cameras using POE and a single computer port. I am inclined to agree with Tim Watts having seen exactly the same done by profesionals and having previously installed dado rail trunking with both telecoms wires and Cat5e running in the separated channels, I noted that distance wise there was little separation between them and the mains wires and was never aware of any interference in either. Richard |
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