Gewiss box Vs tractor

Why is there an earth cable going into a terminal block with a phase cable?
There isn't.


Or is that a single phase installation wired with 3 phase wire with one phase used as earth?
No.

It's a single phase cable with Red, Yellow and Blue cores. If you connect a phase to earth you get a lot of excitement for a very short time.

Although it is obvious, the yellow core should be sleeved G/Y, and the blue should be sleeved black.

That's a bit of a blasé reply from you.

If a sparks was called to a farm and was then was confronted by RF's pic they could assume nothing. So I'm not sure how you know it's single phase installation and the green/yellow cable in with the yellow is connected to earth?

It could be the outgoing flex feeds a 3phase motor and the farmer has just used a bit of 3core flex he had laying around?
 
It could be the outgoing flex feeds a 3phase motor and the farmer has just used a bit of 3core flex he had laying around?

Doesn't the single phase socket in the bottom of the picture kind of hint to its use? :P
 
It is single phase, just missing the SP colour markings, which in my experience didn't seem to commonly get fitted to old SWA.

There is some 3 phase in the workshop supplied from a diesel genny, but this is distrubuted round the farm using a few 32A extentions plugged into one another as and when required. :roll:
 
It's funny what you make of a picture on first glance.

I assumed this was a box feeding some kind of security lighting system.

The SWA in/out is permanent live, switched live and neutral. The smaller conductors are feeding a passive and the guy had no four core flex, so used 3 core, utilising the cpc as the switched live.
 

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