There is a new Exception to 702.6 which may provide an answer to the question of using such switches for transferring portable power supplies.

The exception allows portable generators without transfer equipment per 702.6 if
1. The conditions of maintenance and supervision ensure qualified persons maintain the system.
2. The normal power is physically isolated by a lockable disconnect, or by means of disconnecting the normal supply.

I think the exception re-enforces the requirement for approved transfer equipment unless the condition of the exception is applicable.

[This message has been edited by cpal (edited 01-18-2005).]