It doesn't really matter what colour a cable is , its what size the copper cores are IE 1.5 mm squared cable is 20 amp rated usage , 2.5 mm cable being 30 amp usage . the reason 230v cable on ehu is mostly orange is for the high visibility when in grass but any good quality 1.5 mm cable is actually suitable . yellow cable is used to denote 110v on building sites and now for elf and safety reasons in most industrial surroundings , 110v is classed as safer for work use . One of the most important things is the actual colour of the plug and socket on the extention leads -- yellow 110v -- blue 230v -- red 415v all being 16 amp ( 32 amp ends being larger diameter ) , different colour ends will NOT fit each other . So in the end its your choice , but recommended to use the orange ehu for safty and visibility . I actually have a 25m orange and a 15 m blue which I both portable appliance test ( P.A.T ) at least every year , this is MOST important for your safety !!! .
--- Steve .