Shed cabled electricity supply

Is it the MCB or Rcd that trips?

 

You need a spark to test and isolate it being either the faulty breaker,saw or something else

It needs a set of dead tests carried out. .

 

sounds like having anything other than the big saw or chain saw is over loading the circuit in your shed

 

starting current of chainsaw!!!! probably a 16A MCB

 

What is the rating of the breaker that trips?

 

Yep, prob a B16 tripping. Photo of CU?

 

Yes, sure it will be start current. Titan table saw is prob 1500W, so draws somewhere around 6A at full load. Inrush current (LRA) can be, depending on motor, up to 6 times full load current, so that table saw might be briefly kicking 30+ amps - enough to knock the breaker. I'll leave it to the sparks to suggest the remedy.

 

That's a 10amp breaker ! That's 8.7 amps running current. add that to the 2.21 jigawatts of the radio and there's the answer to your predicament. The breaker is waaay to low, probably because the cable is waaay too small for the sockets and lights and their useage . Sounds like you need an upgrade to use it as a workshop. This is the danger of going cheap, despite the sparks advise. In the future you never know if you're going to buy power tools. Shedology says that a power supply capacity should always be > than anticipated and not < or = to.

 

What size breaker feeds it from the house? Turn it off in the house, take shed CU cover off, let's have a photo inside

 

defo change the breaker and make sure some one has not cheaped out with the cable. And also try a type c or type d breaker. (less likely to trip out from motor start up) hence why it is recomended that outside sockets are run off a type c or type d. As some lawn mowers can trip a type b on start up.

 

Type D should not be chosen willy nilly. It is often difficult to satisfy disconnection times with a type D.

 

Yep to many people just chuck in a Type D without consulting the relevant tables first - it is not cricket tbqh.

 

hence use a type c first then a type d if needed.

 

No. Install a C type. If it still trips re-wire the circuit so the OCPD can be increased. A D type is not suitable for general purpose sockets and I would be very very suprised of the earth loop impedance would be satisfactory even if it was on a dedicated circuit.

 

Exactly. Type D is used rarely, and for things like large transformers, fork truck chargers etc.

 

ahh my bad (working on to many large installs for transformer back ups and big charger feeds recently) got type d on the brain lol.