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Post a picture of your Fuse Box
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AVGresponding:

--- Quote from: themadhippy on October 07, 2022, 08:27:26 pm ---
--- Quote ---Exposed bus bars is a big no-no, they should have a plastic cover over them, which would have been supplied with the box
--- End quote ---
Thats a fairly new idea,can show you plenty of older boards were once the front covers off all the shiney bits are on view,although some manufacturers tried to make it so the cover wouldn't come off unless the main switch was off.

--- Quote --- the fire risk comes from the increased oxidation causing bad contacts, which is more likely from having no backplate and no bus bar covers
--- End quote ---
Large 3 phase busbar chambers seem to work fine without covered bus bars,as do the bars found in large switch panels,the biggest cause of a bad  connection is a miss aligns  device or someone cant be arsed to get there torque screwdriver/spanner out the van

--- End quote ---

Those must be really old installations. The ones I work on date back to the 1970s and though you might get exposed bars from the isolator to the bus bars, the bars themselves are not exposed, though the individual tabs for the MCBs may well be. Long live the Merlin Isobar design! (now sadly subsumed into the Schneider shibboleth)

I rarely use a torque screwdriver, though on something that big I would, and do, use my small torque wrench. I put it to you that installations of that size either are well enough situated that they don't get damp, or they self-Darwinise pretty damn quickly.
Bah, if only I'd been on the teardown of a site we built a year or so back; we built several 3-phase boards into Sarel cabinets, out in the open, during pretty bad weather (snow and ice), for the purpose of supplying temporary cabins for a vaccine centre. I have not heard of any trouble with nuisance tripping etc. The site is gone now, in the last month, but I was at another site. Would have been interesting to see the effects, if any, of the relatively exposed conditions.
themadhippy:

--- Quote ---Those must be really old installations.
--- End quote ---
nope,thers even a piccy of such a beast by wylex  earlier in this thread, they were still being installed upto the 90's and  still plenty of them  in use

--- Quote ---I rarely use a torque screwdriver,
--- End quote ---
In the uk " electrical equipment shall be installed in accordance with the instructions provided by the manufacturer of the equipment" so if they give a torque spec your expected to follow it.
mikeselectricstuff:
This is mine, which is fairly typical of a modern UK setup, which is usually either dual RCDs, with circuits divided between them, or RCBOs.
 The actual box is a 25+ year old dual RCD board, but I recently updated it to RCBOs ( the MCB on the left feeds a secondary board in the workshop, so no RCD as it has RCBOs at the far end)
If it was a brand new install, it would need to be an all-metal box ( this is metal with a plastic front), and have a surge protector, which latest regs have made mandatory in most cases.

Gyro:

--- Quote from: mikeselectricstuff on October 07, 2022, 10:11:46 pm ---... the MCB on the left feeds a secondary board in the workshop, so no RCD as it has RCBOs at the far end...

--- End quote ---

As long as the output cable has suplimentary protection, ie. armoured cable, with grounded armouring - as you have done.
mikeselectricstuff:

--- Quote from: Gyro on October 07, 2022, 10:36:34 pm ---
--- Quote from: mikeselectricstuff on October 07, 2022, 10:11:46 pm ---... the MCB on the left feeds a secondary board in the workshop, so no RCD as it has RCBOs at the far end...

--- End quote ---

As long as the output cable has suplimentary protection, ie. armoured cable, with grounded armouring - as you have done.

--- End quote ---
Yes, it's armoured.
If it did have an RCD at the feed end, it should be one with a higher trip current than at the far end to ensure selectivity, i.e. the RCD closest to the load should trip first. Not sure if this is a requirement or a recommendation, as it's mostly an inconvenience thing rather than safety
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