hi, i have leased out some ground at the back of my commercial premises. the guy wants to run a car washing business and requires an electrical supply to his portakabin. he asked me to provide him with a supply from my fuse box and fit a meter in his portakabin so he can pay me to use my electricity. is this legal? his requirements will be low and i have a very large commercial capacity. i want tp help but not break the law, any help would be appreciated. obviously only professional electricians will be used to do the work