So i wanted to know if when doing a pole mount service repair where the pole is completely stripped and the replacement service is built to code, is the existing trailer feeder thats 3 wire required to be replaced with 4 wire for a repair?
The code isn't really written like that, it's written as minimum standards for new construction.
The service on a mobile home can be separate from the feeder in that the service can belong to a mobile home park and the feeder would belong to a tenant. When an inspector comes to inspect the new service and notices that there is a 3 wire feeder to the mobile home he may demand that it be brought up to code.
In my opinion that would require a separate permit if the mobile home is in a park and the feeder belonged to the tenant . If it's on a private lot they may let the feeder be replaced on the service repair permit or they may choose to ignore it.
I would talk to the inspector about this.
