Can you run a cable from 1 bulding to anther building with no rcd

[Collectors]

A friend is doing up an old railway ticket office that used to be fed off a local level crossing supply. This was for just 2 lights & 1 double power point. They now want a 40amp supply & asked to local lecy board for a new main & was quoted quite a few thousand pounds because it needs a transformer.
Now! the ticket office is next to a small industrial unit that has a work shop with a 100amp 3 phase supply only 20 met away & the owner said they can take a feed from his unit as long as its metered. "Via a 60amp personal single phase meter" Question is:
Can a cable be run from a 60amp switch fuse underground into the ticket office then into a 4 way rcd board. The reason we ask is the workshop it would come from is some times closed & we wouldn't have access to the rcd if it tripped. Is it ok to run the SWA cable underground with a switch fuse & no rcd then have the rcd in the ticket office. This is all to do with preserving a railway ticket office.

 

[EFLImpudence]

Yes.

SWA is used for such purposes to avoid having to have an RCD.

 

[SUNRAY]

For the same 'lack of access' reason I suggest using a 40A double pole mcb as the main switch.

 

[Murdochcat]

Just make sure the SWA is correctly terminated

 

[SUNRAY]

Just make sure the SWA is correctly terminated

not like this

 

[JohnW2]

not like this

Indeed - although, electrically speaking, is there actually much wrong with that (assuming that the armour, twisted, is within that G/Y sleeping). ??

 

[securespark]

Well, the neutral (I assume it's there hiding) and the live are separated within a metal enclosure, which is not good practice.

 

[SUNRAY]

Indeed - although, electrically speaking, is there actually much wrong with that (assuming that the armour, twisted, is within that G/Y sleeping). ??

This is the supply end of a ~20m submain to a mobile phone base station CU, buried directly in the ground, there is no connexion to the armour at either end.

Well, the neutral (I assume it's there hiding) and the live are separated within a metal enclosure, which is not good practice.

Neutral is the grey passing into the same hole as the brown L. the black is in the massive green/yellow sleeve as an earth wire. At the other end it is bolted directly to the 'station earth' which is bonded to multiple earth rods, all of the cable tray - both internal and external, 45metre steel mast, steel framed aluminium equipment huts etc. There is a second feed into the same room as this one from a different DNO cutout with identical earthing arrangements albeit the armour is connected correctly.

 

[JohnW2]

Well, the neutral (I assume it's there hiding)

... I imagine it's the grey behind the brown, in which case ....

and the live are separated within a metal enclosure, which is not good practice.

... they couldn't be much less separated than they appear to be.

In any event, what is your problem with L&N 'being "separated' within a metal enclosure" - what about the L&N going to opposite ends of a double socket mounted on a metal back box?

 

[securespark]

Eddy currents where the line and neutral are fed through separate holes in a metal enclosure.

 

[JohnW2]

Eddy currents where the line and neutral are fed through separate holes in a metal enclosure.

Sure - but that's surely not the case with what we're looking at, is it? If I understand correctly the L&N enter the metal enclosure in the same cable (so obviously through the same hole) and both L & N exit the metal enclosure through the same hole ??

 

[securespark]

Yes, I appreciate that now. But my eyesight is crap, and I thought they were separated, hence my comment about ECs.

Sigh.

 

[JohnW2]

Yes, I appreciate that now. But my eyesight is crap, and I thought they were separated, hence my comment about ECs.

Sigh.

Fair enough. Do you mean that you thought that the G/Y-sleeved one was the neutral? That would certainly be in violation of BS7671