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You won't want conduit, as you'd need a huge pipe to fit 40 cables. Instead, the common solution is to use cable tray. It's available from many manufacturers, in many sizes, styles, and colors. Follow the mounting, and installation instructions for the particular product you choose.
I used to have the electric water heater controlled by my home automation, a system I hobbled together in the 1990s. The heater itself was unmodified, but a 40 amp, 250 volt AC relay enabled or disabled power to it. When I lived alone, it was sufficient to run the water heater for 15 minutes per day in the evening when I was in town (except for the ...
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