Running An Electrical Cable Along An Outside Wall

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Yes I'd agree with that but from someone who's come across cables going in expected routes to then find they suddenly go off at an unexpected tangent, (i.e. cables start going horizontal to what you believe is the socket further along the same wall, so you go to mount a cabinet where you now think it's safe to do so only to discover that of 2 cables running together one has gone off at 45 degrees into a corner recess then vertically to disappear into the ceiling void right where you have just decided to drill!), so from a personal point of view for me it's either straight up/down or in line horizontally without going round corners. Also bear in mind a corner can be a very tight radius.
As far as I'm concerned there is no point in making up your own different rules and then expecting that everyone else has also followed your version.
I've seen the consequence of that. A 'professional' electrician who connected two sockets in a kitchen which were a foot apart, by channeling them both up to the floor above, because he didn't believe in horizontal runs himself.
 
Safe zones are for buried cables, not ones visible on outside walls or otherwise.
It's fine to go via outside although you would rather avoid it. Make sure the cable is supported properly, and protected from uv, any polystyrene thermal insulation, and mechanical damage. That would be either suitable conduit or suitable cable, or a combination.
 
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As far as I'm concerned there is no point in making up your own different rules and then expecting that everyone else has also followed your version.
I've seen the consequence of that. A 'professional' electrician who connected two sockets in a kitchen which were a foot apart, by channeling them both up to the floor above, because he didn't believe in horizontal runs himself.

I've no objection to horizontal runs so long as the sockets are on the same wall, it's the going round corners I would avoid.

Just for the record, I'm not a professional electrician though I did pass my G&G in the mid 70's and also the 14th edition of the regs. Instead of going into house wiring I finished my apprenticeship in armature winding/electrical fitting though did do a small number of house rewires in my younger days. Last month, just because I was bored being off work for over 6 weeks I sat the 18th edition and passed with 87% which I consider not bad after a 40+ year gap.
 
... it's the going round corners I would avoid.

Really don't know what corners have to do with anything. A socket on wall X gives a horizontal safe zone for the full width of the wall.

A socket on wall Y gives a safe zone for the full width of its wall.

If the two walls happen to meet forming a 'corner', then so be it. They're effectively two separate entities.
 
Run it outside through some conduit, not particularly attractive but may be your only option without making a mess.
 
OK, the spark came last week and there was no need for any external cable.

The dishwasher sits directly under where I wanted the new socket to go and that entire wall turned out to be plasterboard. Dead easy in the end.

For the outside socket, he drilled through the wall and mounted the external socket at the exact same height, just on the outside wall.

All-in-all, pretty straightforward.
 

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