Good Old Delroy, he gets all the best Jobs :)

Mike Johnson said:

I stopped watching Dell boys videos some time ago, the question I answered was why you can't drop a cable down a cavity, I gave an answer to that question and many other vagaries that came about because of it.

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DPG said:

You are now saying a bridge should be avoided. We are in agreement.

mainline said:

My point would be that in this instance he can ensure that no breach would exist as it's open and low, giving easy access.

I have no idea of the layout but assume the demand isn't going to be very high, so depending on the layout would think about a radial/s rather than the ring final.

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mainline said:

The real point is that you can if certain criteria is being met.

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Mike Johnson said:

OK tell me how you would drop a cable down a cavity and meet the criteria.

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mainline said:

The real point is that you can if certain criteria is being met.
In Dels case I think it would easily have been achievable, but as usual Del gets it wrong by thinking it's against the Regs.

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Mike Johnson said:

No No No the difference between the Del boy situation is the full stop after your first sentence, where you say dropping a cable down a cavity is acceptable "if certain criteria are met" now try to answer the question of how you would meet this criteria in other circumstance's, your answers so far could be very miss-leading to others reading these post who may take your statements as factual whereas the criteria can not be met in a retrospective installation.

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mainline said:

It is acceptable to run cable in a cavity if the criteria is being met, how can that be seen as miss leading ?.

If you grab a load of cable and stuff it down the cavity causing a bridge or are using cable not suitable for the conditions, then that would obviously wouldn't meet the criteria.
But to say you can't do it would be wrong.

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Mike Johnson said:

This is going no where, you will keep saying you can drop cables into a cavity and I will keep saying it is bad practice and unacceptable in any build, any building surveyor or even a quantity surveyor will condemn or want it rectified before approval or payment is made, you stand on your own, but keep posting you will eventually convince some poor soul that they can drop cables down a cavity and then spend extra time rectifying it on a larger project, where "thats what I'm always done" is not acceptable.

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mainline said:

Right at the beginning I said there are lots of reasons for NOT doing it but to say its “unacceptable” is completely wrong because it is acceptable if the criteria is met, you may very well not be able to meet that criteria but if you can then it's acceptable.

I guess we now are all going to have nightmares thinking about all the properties that have outside sockets and lights that are going to be scrutinized by Mr building surveyor looking at all the bridges of the cavities.

Have you any thoughts how mains tails are run ?

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Pretty Mouth said:

Mike, can you please define 'strawmanning', so the forum can understand where you're coming from

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DPG said:

My meter tails are run in the cavity for approx 4 feet. It is not a good idea and shouldn't be done. Anyone drilling through for example for an outside tap will hit non-RCD protected tails backed up by a 300 Amp substation fuse. No safe zones, so no idea they are there. Don't use that as a good example.

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