The cable between a machine and the wall mounted isolator

[Isetech]

Something I have never really bothered about, if the machine is supplied with a the cable attached.

Lets say I install a 32 triple pole isolator on the wall, connected to a 32 amp D curve breaker in the main DB, fed from a 4 mm 4 core+E surfix 30 metres away.

The machine arrives and it has a 1.5mmx 5 core cabtyre hanging out the machine for connection to the isolator.

Can you connect the cabtyre directly to the isolator ?

[Dylboy]

Interesting, i would say yes, you designed the cable suitable protection. What ever the appliance has is non of our concern as we only test to isolator for fixed appliance in that case.

However if the manual tells us what size CB to have then I would follow that as manufacturers instructions.

Still interested as we test to connection points or terminations so then is that the appliance chocolate block or the isolator?? I say isolator as that machine can be changed whenever but the installation wiring is correct.

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[Derlyn]

That piece of 1,5mm lead is part of the installation, much the same as a stove.

One cannot have a 32A breaker protecting a 1,5mm cable. Max is 16A, therefore there are 2 options. Depending on the rating of the machine, either upgrade the lead or downgrade the circuit breaker accordingly.

[Derlyn]

@Dylboy.

I must disagree with your statement about only testing to isolator for fixed appliances. The code includes the wiring up to the connection terminals on the appliance.

As soon as there is an isolator involved, then the wiring between the isolator and appliance is part of the installation.
This is,however, not the case with a socket outlet.

[Dylboy]

I do agree as well but when the cable is on the appliance then I sometimes wonder as then I need to open the back plate of the oven for example and potential to void a Smeg warranty haha

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[Dylboy]

But end of the day the CB must cover that lead anyway.

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[BobZA]

That piece of 1,5mm lead is part of the installation, much the same as a stove.

One cannot have a 32A breaker protecting a 1,5mm cable. Max is 16A, therefore there are 2 options. Depending on the rating of the machine, either upgrade the lead or downgrade the circuit breaker accordingly.

I agree. Unfortunately will have to provide adequate protection for the 1.5mm cable. Being only 1,5mm the appliance does not need more than 16A ... so easiest is to just put 16A c/b in db.

[Isetech]

If we do an installation were we install a cable and isolator, generally we would be connecting the machine or fixed appliance, so the whole circuit from the DB to the appliance terminals will be done by us, however I have noticed in may cases the person who installed the isolator is not the same person who connects the appliance to the isolator.

Another example would be were an installation is completed, the company disconnects all the machine sand moves, a new company moves in a uses the isolators supplied.

I would assume the person who connects all new machines would have to supply a supplementary COC for the connection from the isolator to the machine/appliance?

The same with a geyser, if a plumbers replaces the geyser and replaces the wiring between the isolator and the new geyser. IF the wire from the DB to the isolator is 4 mm fed from a 30 amp mcb, you cant just replace the geyser and the wire from the isolator with a 2.5 mm FTE. The breaker would need to be replaced with a 20 amp mcb.