Had the EICR check today and a couple of things came up for me to resolve, one of which is the Earth cable to the mains power supply needs upgrading to 16mm - current 2x6mm. I've a chasing tool and thinking it's worth the minor hassle of burying the cable. I'm assuming it still needs to be trunked, i.e. chase out, insert trunking insert cable, fit trunking top and then filler. I know there's regs regarding the routes taken by buried power cables, but I'm assuming these don't apply to just an earth wire? Can I just take the shortest route?