scenaro

[malcolmsanford]

Metrel TEK 633 AC DC Earth Leakage Clamp Meter

Excellent little clamp meter that detects protective conductor current, I got 3 of them for out here and use them daily.

As for your tripping MCB, I would go down the line with Chr!s and do an IR on the appliance, you may find somewhere on of them is giving you a low resistance on an element.

I would also change the MCB, if it's an old one you may find that as Tel posted, after being on the top end of it's loading for a few years it may have gone past it's best.

 

[domestic spark]

Thanks Malcolm obv with seeing how the ring was wired, it just made me think ah! Problem solved, didn't factor any other problems it might be. Usually I'f it is faulty appliances it's usually the rcd that goes due to faulty elements or whatever. However rewire of circuit does still need doing as cable is seriously overloaded. But this a customer doesn't really worry about if you know what i mean. Didn't want to rewire and TRIP!

 

[telectrix]

rewire the bugger, test , of course, then if it still trips, at least you can eliminate the new wiring and get down to some serious fault finding. find out what day the pikeys do the rag/bone run to get rid of the faulty appliance/s.

 

[tony mc]

There are lots on the market some very expensive. I use a T.I.S 550 its excellent and was on offer at CEF for under £100 and is used all the time reads down to 1 mA earth leakage and up to 150 A current!!

 

[Jurasic Spark]

Originally Posted by Jurasic Spark
The c/b doesn't care whether its supplying a RFC or a Radial, it is tripping due to overcurrent which means your radial 2.5 is exceeding its CCC.

so jurasic spark, if a 2.5mm spureded cable IS overloaded, MCB will trip? even though its a 32A breaker.

2.5mm can carry approx' 27A so obviously above this, but not above 32A and the cable is overloaded but the c/b won't trip. I thought you were considering turning this radial into a RFC but this won't effect the amount of load taken. If its above 32A then the c/b still does its job.

 

[bugsy]

Do you think you get short circuit discrimination between a 13 amp 1362 and a 32 amp Type B MCB? I dont

Well its not a certainty thats for sure

Your obviousley a much better tech than me so ill just shut

 

[bugsy]

Do you think you get short circuit discrimination between a 13 amp 1362 and a 32 amp Type B MCB? I dont


Well its not a certainty thats for sure

I'll just shut up then!

 

[Chr!s]

Your obviousley a much better tech than me so ill just shut

I'll just shut up then!

LOL, i think we all made fair comments, like Malcolm said could be a faulty MCB. With no cooker on the circuit it need 36 amp for more than 1 hour, thats a fair load.

But you right, the 13 amp may blow, a lot depend on the level of fault current, 13 amp fuses have a wide tolerance for disconnection, so its very possible for a mcb to disconnect first, its a bit of a lottery with 13 amp fuses