There are no Regulations per say however policies with respect to Ship keepers, at least on the Great Lakes, are set by the ship owner. Their primary responsibility is to provide security on the vessel when the crew have left the ship. They are also obliged to make regular rounds to check for oil or water leaks in machinery spaces, do soundings of ballast tanks, provide access to secure spaces to shore contractors doing work in those spaces and do daily security/fire watches after shore contractors stop work for the day, keep the accommodations clean and check in with the office/vessel manager daily.
The Captain or Chief Engineer can assign tasks such as cleaning disassembled engine parts or painting while the crew are away and assist the crew during Lay-up/Fit-Out. If the ship keeper does that sort of work he is paid extra over and above his basic salary.
The Ship Keeper is obliged to follow all provisions of the Canada Labour Code and the Company's Health and Safety policies with respect to working alone, confined space entry etc.
The Ship Keeper is not permitted to operate or make repairs to any machinery such as generators, OWS, Purifiers or Shore Power. He is authorized to operate machinery such as Cranes for shore contractors.If in the event of any machinery failure the Ship Keeper is obliged to contact the vessel manager and the manager will arrange either one of the ship's engineers that may live close by or an outside contractor to make the repairs
Troubleshooting 101 "Don't over think it - K.I.S.S. it"