ECN Forum Forums Code Related Discussion NEC & other Code issues Art. 550 Manufactured homes services

Article 550.32 (b)(3) means shall be provide for the connection of a grounding Conductor to the service equipment and routing it OUTSIDE the structure.
As Most if not all Manufactured homes require a 4 wire FEEDER . Yet code says inside IF meets provisions.??? How can this section be complyed with if a Disconnect is not installed out side the Unit. Are any Manufactured homes wired with a 3 wire with the service inside and grounding Electroid conductors brought there???