Storm Glands.

Why use metal capping for the short run from the ceiling to the consumer unit just below anyway?

‘twas standard practice back in the 1980s - when houses were plastered with two coats of wet plaster (rather than being dot-and-dabbed with plasterboard). Anywhere cables could have damaged by a plasterer’s trowel (which usually had razor sharp edges if the plasterer was any good) and the damage hidden under the plaster, capping went on, no matter how short a run. I don't think electricians used to trust plasterers much in those days.

(It was often quicker to nail on one bit of capping than clip several cables individually too)

  - Andy.

Why use metal capping for the short run from the ceiling to the consumer unit just below anyway?

‘twas standard practice back in the 1980s - when houses were plastered with two coats of wet plaster (rather than being dot-and-dabbed with plasterboard). Anywhere cables could have damaged by a plasterer’s trowel (which usually had razor sharp edges if the plasterer was any good) and the damage hidden under the plaster, capping went on, no matter how short a run. I don't think electricians used to trust plasterers much in those days.

(It was often quicker to nail on one bit of capping than clip several cables individually too)

  - Andy.