Rcd selection

[Dm7192]

I am rewiring a 2 bedroom outhouse which I've been made aware will include a supply to a shed.
I'm told the shed will we used as a work shop using equipment such as rotary grinders, motors, welding equipment and other power tools.
I know welding equipment can produces supply distortion's a I.e. harmonics and motors have high inertia currents therefore I am protecting this circuit with a type D breaker however I am unsure as to what sort of characteristics my Rcd should have to deal with this load type, should I use one with a delayed trip facility or possibly 100mA trip tolerance?

Any help on this is greatly appreciated thanks

 

[dan86]

http://www.select.org.uk/downloads/BEAMA Installation RCD Handbook V2 2010 updated (2).pdf

 

[HandySparks]

An ordinary 30mA RCD of appropriate current rating should be just fine. If it's typical 'small workshop' equipment in good condition you won't have a problem. Consider splitting the loads over more than one RCD if there's going to be more than one item of equipment in use at any one time.

 

[Guest55]

be aware that type D's have a fraction of the max Ze of type B's , which will impact on your cable / cpc selection.

 

[Engineer54]

be aware that type D's have a fraction of the max Ze of type B's , which will impact on your cable / cpc selection.

A fact that many newer sparks forget, and even some of the older ones!! lol!! I'm sure you meant to say max Zs there Biff!! lol!!