Used commercial dishwasher rcd trip rating.

Is it a TT installation? If not, there might not be a need for an RCD at all. (Presuming it's not fed via soft sheathed cables concealed in a wall etc.)


   - Andy.

No Andy,

Tncs or tn,cable is swa.

                                  Regards,Hz

Check manufacturer's instructions.


Some require the machine to be connected via a plug and socket-outlet, in which case BS 7671 will require a 30 mA RCD ... HOWEVER, some machines have high protective conductor currents, and this may trip the RCD (you will need to get the customer's Duty Holder to sort this out via a suitable risk assessment to satisfy 411.3.3). Where the machine has high protective conductor currents, additional earthing may be required (the machines may meet BS EN 60204-1 and not BS EN 60335-series, in which case this may not necessarily be labelled on the machine itself).


With some machines, the manufacturer states the protective devices that are to be used, and this may include RCD.


It's not possible to second-guess the manufacturer's installation requirements.

Many thanks,

                       Hz

Our guest house is TT, Our kitchen is on a 30mA RCD, so that is a single phase commercial dishwasher, commercial fridge, hot cupboard and three phase deep fat fryer. The ancient oil boiler and controls are also off the kitchen RCD. Other than a real fault on the warming plate of our gas cooking range, we have not suffered from nuisance tripping. 


Regards,


Alan.

Alan,


Agreed ... not always a problem, but I do know for certain that some commercial laundry/dishwashing appliances, single-phase and three-phase, do have (at certain points in the cycle, or when opening the door lock) high protective conductor currents sufficient to operate a 30 mA RCD. These machines also require supplementary earthing to meet BS EN 60204-1 and BS 7671 requirements.


The only place you can find this information is in the installation instructions.