Yorgo
Member
We have over a hundred dock doors at a facility that is getting upgraded dock fans. The new fans have FLA of 9a. The existing are FLA 3a, and are currently tied into the dock leveler controller, via control transformer (500va). This is clearly not an option anymore. What I'm thinking for a resolution is to utilize 2kva step-down transformers (480 to 120), tying into the dock leveler circuit, which is on a 30a 3ph circuit. I'd like to make this a cord/plug setup too, to avoid GEC connections, since this would require aerial work. Does this seem doable, or am I missing something? The purpose of this and not new dedicated 120v circuits is because of the giant labor factor and aerial work, at a place with very limited elevated work windows.
If this is feasible, how could I implement Prim and Sec overcurrent protection, in the smallest way possible? Need to consider limited wall space. I did find a company, Larson Electronics that make the xfrmr with cord on prim and sec, and has sec OCP but not on the primary. These people want an arm and leg too, but I'm assuming it's at least a listed unit. With their unit, all I'd need to add is primary OCP. Thought??
If this is feasible, how could I implement Prim and Sec overcurrent protection, in the smallest way possible? Need to consider limited wall space. I did find a company, Larson Electronics that make the xfrmr with cord on prim and sec, and has sec OCP but not on the primary. These people want an arm and leg too, but I'm assuming it's at least a listed unit. With their unit, all I'd need to add is primary OCP. Thought??
