Clarke XET19 Compressor keeps tripping me 50a RCD Help please?

ITs a 4 hp motor so about 3kw running , at start up it can draw 3 to 5 x current for some time, which could be exceeding the 40 amp mcb, you may need to consider a type C rather than type B , which has greater starting current capacity. YOu will need a electrician to fit new mcb and allow him to look at installation, cable size ( l assume nothing else is on this circuit) and to check resistances etc. ALternatively he may suggest a 50 amp type B.

 

Sorry just noted you already have a 50 amp breaker, the electrician will also need to look at cu layout regarding circuits on your Rcd you have a couple of rings plus shower ? So may have problem when air compressor cuts in.

 

A C40 would be what is required, but cable sizes would need checking. Looks like 6mm. Long run? Through a loft?

 

I would consider installing this on the non-RCD side of the board, or if not possible, using a separate board.
There's no requirement for RCD protection.

 

Could be a faulty MCB but you need a spark too test.

What is tripping the RCD or the MCB?

China made products dont always tell the truth about the current values.

 

Adam, has this just started causing a problem, or is it a new install.

I had a prob' some time ago & found the Earth was not good enough.

 

tube Linx please

 

ooooooook

 

No that is not the problem at all. The 100 amps is usually the rating of the main switch, in fact most domestic type c/units are of that type.

 

Classic neutral being in the wrong neutral bar.

 

RCD's don't trip on overload, they only respond to N-E or L-E faults, check the neutral bar connections as Lec said.

 

I would have thought incorrect wiring would have been discovered after the checking of the new installation of the new circuit.
However to be more constructive this does again highlight ' development' through the thread.

Is it worth the forum generating a simple 6 to 10 point list of items that should be checked off by new posters to ensure their questions are framed effectively.

E.g.

Have they checked previous questions
Is it a new installation or a fault with previous working one.
If a component is failing / tripping what is it exactly , complete with model number.
What tests have been conducted,
Include photo where possible


Others I am sure can add a few common themes,

This may enable a more focussed response / resolution.

 

The neutral is the wrong neutral bar. It should be in the 1-5 on the left. Three neutral bars, one for the left hand RCD, one for the right. The third is for the main switch, but no MCB there.

Neutral is 100% in the wrong bar. 1-5 should correspond with MCB 1-5 on each RCD. Neutrals are not the incorrect order, which isn't a huge problem, unless they are in the wrong bar, which yours is.

 

Yep Neutral terminated in the wrong Neutral bar.
The three Neutral bars are there for the two RCDs and the main switch.
The Neutral bar on the right has nothing connected because you have no non-RCD circuits.
Such circuits would be between the main switch and the RCD closest to the main switch.
The middle Neutral bar (the one you have connected the blue wire to, is for the RCD closest to the main switch.
The Neutral bar on the left is for the left hand RCD.
It is full up, because you have 6 MCBs protected by the RCD 5 plus the compressor.
Remove the blue wire from where it is terminated in the middle Neutral bar and terminate it in the left hand bar.
You may find it easier to terminate, if you remove the wire from terminal 5 and terminate that wire in terminal 4 along with the wire already terminated in terminal 4.