Just to be clear, I presume that what John was asking is whether you are sure that the socket is part of the ring, and not already a spur from a socket on the ring.Cheers, yes it is on a ring.
The presence of 2 cables on it's own means nothing.Yes, it's on the ring circuit with no cables spurring off dishwasher socket
to eliminate the possibility of it being a spur with another spur connected to it.turn off all power and test for continuity between the two L, the two N and the two E)
Actually, to be certain, an end-to-end test does not guarantee a correctly installed ring final.if you can verify that the dishwasher circuit is on the ring (turn off all power and test for continuity between the two L, the two N and the two E) then yes, you can
That doesn't guarantee it.There must be two, and only, cables currently going to it, each with the three cores I mention.
Actually, to be certain, an end-to-end test does not guarantee a correctly installed ring final.
There could be a ring within a ring or other anomalies.
To check for a true, properly installed ring final, you'd need to do cross connections at the board and check the readings at each outlet.
I don't think JohnD was talking about 'end-to-end' continuity, since that woul tell one nothing about how an individual socket had been wired. I think he was talking about disconnecting the socket in question and testing continuity (of L, N & E) between the two cables that had been disconnected.Actually, to be certain, an end-to-end test does not guarantee a correctly installed ring final.
For a start, I don't think one would be able to detect a short spur by doing that - low resistance measurements are simply not accurate enough. Furthermore, as EFLI has asked, which of the 'anomalies' of circuit arrangement do you think would preclude taking a spur from the socket in question (if it satisfied JohnD's test)?There could be a ring within a ring or other anomalies. To check for a true, properly installed ring final, you'd need to do cross connections at the board and check the readings at each outlet.
this is rarely complied with, and one is being a bit pedantic to suggest such measures. i.e. behaving like me!connecting cookers, ovens and hobs with a rated power exceeding 2 kW on their own dedicated radial circuit
What aspect of dish washers (or, indeed, washing machines) do you think qualifies them as "cookers, ovens and hobs with a rated power exceeding 2 kW" - which, as you go on to quote, are the appliances for which the guidance of App 15 of BSA7671 suggests that they should ideally be on dedicated radial circuits ?And today the dish washer heats up very little water, yes technically over 2 kW and not portable so it should have a dedicated supply, ...
It is not a hard and fixed rule, and the load from an oven under 3 kW will be a lot less than a washer/drier or drier on the drying cycle. Due to the time it draws the high current for.BS7671:2008 said:The load current in any part of the circuit should be unlikely to exceed for long periods the current-carrying capacity of the cable (Regulation 433.1.5 refers). This can generally be achieved by:
(i) locating socket-outlets to provide reasonable sharing of the load around the ring
(ii) not supplying immersion heaters, comprehensive electric space heating or loads of a similar profile from the ring circuit
(iii) connecting cookers, ovens and hobs with a rated power exceeding 2 kW on their own dedicated radial circuit
(iv) taking account of the total floor area being served. (Historically, limit of 100 m² has been adopted.)
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