These interlocks should pass local muster but there is no guarantee.
Some interlocks supplied by the panel manufacturer permanently install the mechanical interlock in a manner that allows the removal of the front cover but still keeps the interlock in place an operational. It is this ease of defeating the interlock that is the problem. It is easy to defeat this interlock by merely removing the four to six screws holding the cover in place. Most "aftermarket" interlocks bolt to the circuit breaker panel's front cover and mechanically prevent both the panel's main circuit breaker and the designated generator circuit breaker from both being closed at the same time. an interlock has a movable metal bracket that some inspectors dont likeīut a subpanel set up uses the same brackets ,just on a seperate panel,no? USA, Universal Changeover Switch|Manual Generator|3PDT Center OFF|Rotary Cam| RV Transfer Swith| Pedestal Power Supply | Boat Panel | Power Source| Utility | Line | Shore| Back-up Power| Solar Energy| Battery Charger| Rectifier | Transfer Switch| Here is a switch that looks good and for a reasonable price. The cost is maybe a little more than the all-in-one transfer panels but the quality is definitely higher. What bob_m is advocating, and what I also advocate, is a standard sub-panel fed from the service panel through a three-position switch giving the sub-panel the ability to be powered from the utility (via a circuit breaker in the service panel), be completely off or be powered from an on-site generator. They are acceptable for what they are used for but I agree that they are NOT the same as the circuit breakers in regular panels. The transfer PANELS have what are known as supplemental circuit protection circuit breakers. The transfer switches have cheap breakers from what I have heard.
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