current difference

maguire · 13 Oct 2010

Hi All I have a current draw of 5.6 amps Line and 10.7 Neutral any ideas why I should have such a disparity.

Devlin

holmslaw · 13 Oct 2010

ricicle · 13 Oct 2010

Is this a single phase circuit ?
Is it domestic or industrial ?

maguire · 13 Oct 2010

It's single phase suppplying a combi oven, testing it at the terminal block inside the oven I have good access and the tails are on their own no other supply in the same area and the reading responds to the boiler elements cycling on and off, I have metered the elements and there is none down to earth or open,although the cavity elements are tripping an upstream 80/30 RCD and its own 63/30 this is a new circuit I installed during an CU upgrade and new radial circuits all other circuits are ok, total load for this circuit is 9KW wired in 6mm T&E
Devlin

ricicle · 13 Oct 2010

5.6 or 10.7 amps is not 9kW. What do you mean that the reading corresponds to the heater(s) cycling on and off ?

What is the constant current reading when the heaters are on-load ?

Are you sure that the readings are on the primary L + N to the oven ?

Is it a true RMS meter that you are using ?

Are you viewing the readings in real time or are they samples ?

maguire · 13 Oct 2010

Sorry the 9k is total load if all are working together ie cavity and steam this will not happen as it's either or. the elements I am testing are the boiler elements 3 X750w 2.25 KW so I should get 9.8amps in and out but i get 5.6 L and 10 N I use a cheapo clamp it's generall good for guidance I have not checked each element individually so maybe thats the next check
Dev

plugwash · 13 Oct 2010

is there any current in the neutral with the device turned off but still connected to the mains?

Higher current in neutral than in live could be indicative of a neutral-earth fault.

maguire · 13 Oct 2010

Pugwash cheers for that, gives me another avenue to explore, This things been out of commision for 3 years and each fault I clear somthing else pops up Ho Hum another day another challenge
Dev

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current difference

holmslaw

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