Original Message

I’ll assume you’ve not done power line work for large companies? Several of the big power providers have set their own standards for subcontractors to be allowed to work on their systems.
Also big contractors like Quanta will also have a standard. Some places have internal auditors some use recognized auditing companies.
Getting qualified has very little to do with the FAA side of things, more about pilot qualification for the work sought. Maintenance, record keeping, documentation of all kinds of stuff like ropes, rigging, etc right down to how and where you store engine oil.

Typically for a single machine operation with one or two pilots it won’t be too terrible