only 2 wires to cooker safety switch HELP

[chillimess]

Hello
I have recently moved into a house
i have plugged in one of those wiring testers with 3 lights on it for problems with earth/live cable/fuse etc

when i tested 2 of my kitchen sockets it said they were not earthed
so switched electric off. took socket covers off - wiring ok. but i traced the wiring this is what I found.

The cooker switch box has one thick red wire and one thick black wire entering it from the main supply - but leaving it is red/green-yellow/black going to cooker terminal and also red/green-yellow/black going to another single socket which has a spur going to a double socket

I don't know much about electrics, but this does not seem right to me. shouldn't it have an earth?

Please help me

Thanks in advance

 

[ryanj]

Is the wiring done in conduit? (Pipe for running cables in)

If it is, that may be used as the "earth".

 

[chillimess]

they seem to be separate wires no sheathing

thanx

 

[ryanj]

Yes, but does it seem to come from a "pipe"?

 

[chillimess]

not that i can see. i can only see the wires. they do not have any give. if i put my hand down the inside of wall all i can feel are the two cables

Sorry i don't seem to be of much use

 

[securespark]

Can you not see if the single cables go into a conduit tube or are just buried in plaster?

Whatever, the earth appears to be missing. Unscrew one of the dodgy outlets and put the probes of a MM set to continuity- one on the dodgy box and one on the earth conductor in the cooker outlet. Do you get a beep?

However, running outlets off a cooker circuit does not sound kosher done the way you describe. Maybe a job for a spark?