My customer has purchased a generator for working in his house- no electricity atm . I’ve been reading the manual ( bit sad I know) to get familiar with it . It’s a ROCWOOD RWPG1E 110/240 volt unit . The manual talks about grounding the generator which I assume means earthing it. There is an earth point on the genny but no ground cable supplied. My questions are 1 can I use any type of cable eg a 10mm earth bonding cable and attach it to a ground earth spike . 2 is there a limit on how long the ground cable is . On a 3rd point if I extend the exhaust to run outside allowing me to use the genny inside would this damage the genny . As a gas engineer I’m acutely aware of carbon monoxide poisoning and do not wish to poison myself or my labourer . TIA for your help with this issue.