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What did you use in the end?

You should ideally install a brick pillar and put in a catnic for the outside bit, or use one of the longer, heavy duty catnics which are made for the job. Catnic themselves can work out which one you need from your load calcs and drawing.

Stitch drill!

@sparkwright If the sleeved cable was the neutral, the light would be on constantly. The OP says it doesn't work at all. A picture paints 1000 words.

@big-all Quite possibly... there are several factors at play. In DC areas a lot of breakers are shunt magnetically actuated and don't incorporate a protection relay as such like the AC gear has. This can make them slower to operate than other switchgear. Furthermore, the lowish voltages make...

Ref. shared areas, a lot of the time BR (and, now Network Rail) would drop their voltage on the shared line, or leave it alone if the train could manage the difference. The key difference is that eg on Bakerloo line outside Queens Park (where NR take over) the voltages are 650V and 0V, ie there...

Put it this way. On a steady gradient you'd need to be pretty well constipated and/or disposing of large amounts of wipes/towels to be able to fill a 4" pipe so much that no air could flow freely within it. And that's flushing with a thimble of water each time. Adding 10% to get 6.6m is just...

BCO might insist on an Air Admittance Valve at the top of the run. Or they might just ask, and you can answer forgetting about the added bits. I've got away with more.