high readings at (some) socket outlets

[GT1]

I'll be pulling the circuit apart anyway..
However, Thought Id run it past the forum before I do.
Been testing today prior to CU change soon.
When testing one of the 2 RFC's at the house all was going well, until i got very high readings at about 4/5 of the socket outlets upstairs.
I was testing for my final R1+R2 figure. I was cross connected as required at the board.
The first few sockets were coming back around 0.45 or so.
Then I started getting readings at 50 ohms...?

The curious thing is, the end to end readings (r1, r2, rn) for the circuit were fine, well below 1 ohm and all as expected..
If i had a poor/loose connection somewhere then I would have thought it would have shown on the end to end readings too..?

The high readings are all quite close to each other, within 4/5 ohms..

As I said I'll be pulling it apart anyway, just wondered if anyone had experienced similar..?

cheers.
GT

 

[Fin170]

Potentially dodgy socket wiring?

I've found twisted cpcs and Screwfix quality sockets to been the cause before

 

[Octopus]

Dirty contacts - plug your tester in and out a few times and retest.

 

[GT1]

yes well its been modified over the years. It was originally an upstairs ring but its been extended downstairs into the kitchen for several sockets..!
Its mainly the end to end readings being normal that's thrown me.

 

[itselectric]

Are you plugging in to the sockets to get readings? If so, try pushing the plug in and out a few times to "clean" the contacts which the pins touch. I have had it before where little used sockets have had dirty pins.
Or try unscrewing the fronts and use probes to check your readings.

 

[GT1]

thanks murdoch.. tried that but no change.. and one of the high readings is at a brand new (6 months old) socket..!

 

[itselectric]

thanks murdoch.. tried that but no change.. and one of the high readings is at a brand new (6 months old) socket..!

sounds like you have a ring within a ring.

 

[onions1066]

It is just old worn sockets. I do a lot of testing and a few things you find is the right hand side of a double is generally higher reading than the left as this is the side most people use first, just try flicking the switch on the socket a few times and that will bring it down usually if it doesn't the socket requires changing. Nothing more than wear and tear to the sockets

 

[onions1066]

And them single to double conversion sockets always give high readings even when they are brand new

 

[telectrix]

or is it a few sockets spurred off with a poor connection where they come off the RFC?

 

[onions1066]

50 ohms is too high for me to think its a spur from the ring, I'd be checking the sockets first

 

[GT1]

no single to double conversions and some of the sockets are brand new, some of them about ten years old.
Gave my plug in tester a good twist and a pull in each them too, without change..
The high readings are all on one side of the upstairs too..

My gut feeling is its a fault when additions have been done..

 

[GT1]

onions.. yeah im sure its not a spur problem either.. waaay to high for that.
Ive found spurs elsewhere on the job and theyre perfectly acceptable readings

 

[telectrix]

sorry. misread OP as 5.0 ohms.

 

[Andrew Youll]

sounds like you have a ring within a ring.

I'd agree with itselectric if it's not a spur off the ring it's gotta be an interconnection.

Try getting readings at the back of the sockets on the terminals will be a far more accurate reading, takes socket issues out of the equation.

 

[GT1]

Problem solved.
Just goes to show, never discount the obvious.
Those sockets are on a different circuit..!!!

 

[Guitarist]

Problem solved.
Just goes to show, never discount the obvious.
Those sockets are on a different circuit..!!!

Indeed, never take anything for granted with electrics. I even find sockets fed from lighting circuits occasionally.