Alfie Jenks
If you have a ring coming off a ring this would be the same as having a spur wired in 5mm cable which can easily handle more than 2.2 kw. 230 volts times by the rating of the mcb (32) is the amount of power that cam be drawn from the circuit before the mcb operates (trips) however we have to make sure the cable that's being supplied by this mcb is not under rated. A single 2.5 mm twin and earth cable can handle over 16 amps all day long. Put two together and you get 32amp. If your spur is a small ring added to an existing ring it's likely the cable will be able to handle it. However its not advisable as the ring may be broken somewhere reducing the rating of the cable and increasing the risk of cable over load and fire. For peace of mind I would ask an expert to install a 4mm radial circuit on a 20 amp type c rcbo. This will give you 4.6 kw of power, a cable that can easily handle to load and a protective device that can handle the high start up current of the saw with rcd protection which is a requirement. The parts should cost around £80 ish. The labour is half a day. You shouldn't pay any more than £200 for the whole job.
