I bought this to fit on our Square D 200A main panel. Attaching took less than thirty minutes once I had all the details. This is a great product but the instructions are vague. If you order a mounting kit, it makes sense to install it inside the main bezel. The kit is available separately from Amazon here: http://www.amazon.com/gp/product/B00DKYOFZ4?redirect=true&ref_=cm_cr_ryp_prd_ttl_sol_4 The mounting kit comes with bracket, end plates, hardware and instructions. On the square D-plate, the black wires are attached to two studs between the main switch and the busbar, and the mounting bracket itself is attached to the neutral busbar.
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