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- 27 Jan 2008
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I have over the years noted that the Germans free air the cables around corners, it has been picked up on many times how their methods don't really comply with our rules. Their conduit is used as a straight run, and at the end it has a fitting to stop chafing and then free air to next bit of conduit.
521.10.1 Non-sheathed cables for fixed wiring shall be enclosed in conduit, ducting or trunking. This requirement does not apply to a protective conductor complying with Section 543.
Non-sheathed cables are permitted if the cable trunking system provides at least the degree of protection IP4X or IPXXD. or if the cover can only be removed by means of a tool or a deliberate action.
I had not noted the "deliberate action" bit before. We also have:
543.3.6 Every joint in metallic conduit shall be mechanically and electrically continuous.
I only have BS7671:2008 so may be changes?
I find we in general have been taught what is permitted over the years, and often we can't relate this to a set regulation, I was taught for example we should not have a fig of 8 in ring finals, and when inspecting and testing we should test to see if we have any fig of 8's in the ring, seem to remember we followed a book 3 issued by the IEE as it was then. However I can't find any regulation to state this, same as the number of cables in a conduit, it is in the guide to the 16th edition, but never found it in the 16th edition.
Since the 17th edition I have questioned the use of metal capping:
522.6.8 Irrespective of the depth of the cable from a surface of the wall or partitions, in an installation not intended to be under the supervision of a skilled or instructed person. a cable concealed in a wall or partition the internal construction of which includes metallic part, other than metallic fixings such as nails, screws and the like, shall:
Since metal capping is not earthed its use means the wall includes metallic parts, it was used to protect cables from the plasters trowel, and it did not flex like the plastic stuff so it was easier to plaster over, in the main I would say the oval conduit has replaced metal capping although it was also used over micro bore central heating pipes so is still available.
But these rules are down to how we interpret them, we have debated on here things like does a RCD form a circuit, it was a grey area, not read the new regulations so maybe now better defined? But my point is not to start up yet another debate, but to point out we do interpret what we read, it does not say you must use sheathed cables, but tells us what we must do with non-sheathed cables.
I always felt the C&G2382 should not simply ask what the BS7671 says, but should give an example and ask it this is permitted in a similar way to C&G2391 but all it does at least when I took the exam is show you can read, it does not show you have understood what you have read.
521.10.1 Non-sheathed cables for fixed wiring shall be enclosed in conduit, ducting or trunking. This requirement does not apply to a protective conductor complying with Section 543.
Non-sheathed cables are permitted if the cable trunking system provides at least the degree of protection IP4X or IPXXD. or if the cover can only be removed by means of a tool or a deliberate action.
I had not noted the "deliberate action" bit before. We also have:
543.3.6 Every joint in metallic conduit shall be mechanically and electrically continuous.
I only have BS7671:2008 so may be changes?
I find we in general have been taught what is permitted over the years, and often we can't relate this to a set regulation, I was taught for example we should not have a fig of 8 in ring finals, and when inspecting and testing we should test to see if we have any fig of 8's in the ring, seem to remember we followed a book 3 issued by the IEE as it was then. However I can't find any regulation to state this, same as the number of cables in a conduit, it is in the guide to the 16th edition, but never found it in the 16th edition.
Since the 17th edition I have questioned the use of metal capping:
522.6.8 Irrespective of the depth of the cable from a surface of the wall or partitions, in an installation not intended to be under the supervision of a skilled or instructed person. a cable concealed in a wall or partition the internal construction of which includes metallic part, other than metallic fixings such as nails, screws and the like, shall:
Since metal capping is not earthed its use means the wall includes metallic parts, it was used to protect cables from the plasters trowel, and it did not flex like the plastic stuff so it was easier to plaster over, in the main I would say the oval conduit has replaced metal capping although it was also used over micro bore central heating pipes so is still available.
But these rules are down to how we interpret them, we have debated on here things like does a RCD form a circuit, it was a grey area, not read the new regulations so maybe now better defined? But my point is not to start up yet another debate, but to point out we do interpret what we read, it does not say you must use sheathed cables, but tells us what we must do with non-sheathed cables.
I always felt the C&G2382 should not simply ask what the BS7671 says, but should give an example and ask it this is permitted in a similar way to C&G2391 but all it does at least when I took the exam is show you can read, it does not show you have understood what you have read.
