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Raspberry Pi Class
make sure wiring is correct and check amperage in each channel. Use fuses on the 115 side if you are just unsure. Pi should be isolated however if the SSR fails they typically fail 'closed' which is why I recommend the fuse. Do not string together more than the recommended amount of lights to each channel. Try testing with a simple setup as osprey has done in step 7 to measure amperage before placing on Christmas tree. If you are the slightest unsure have a electrician check your work before connecting mains, electricity is no joke.
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