Good morning all.please see the picture attached , there is a cable coming from the ceiling ( one cable , and connected somehow to the main ring - i believe whether a junction box or else ) attached to a 13 amp fcu . the fcu outputs 2 cables : -one goes to a 3 pin socket to be used for a dishwasher ( the dishwasher is 10 amps itself ) -- and -one goes to a 3 amps FCU Then connects using a flex cable to a boiler (boiler rated at 3 amps ) The switch board is old and does not have RCD . is that enough or should i use RCD spur to replace the fcu or any where else . any suggestions or help is really welcome. thank you .