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Mains soft start

My shop is powered by a 50m extension cable driven from a wall socket in the house. When the table saw is started it draws so much current that their is a significant voltage drop over the cable. This drop means the shop lights go out, sometimes for up to 5 second. 

To solve this I want to build a soft start circuit that limits the huge inrush current from the table saw. 

This is the circuit I plan to use: 

All the ports collected together.

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