Because its unavailable. and it costs over $300. 
MORON!
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But this seems low risk and no playing with 110.
Fun and dangerous.
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Cost is a factor, safety is a factor. However, stock on hand sometimes is the deciding factor. Now, I just need to follow-up with enclosing the SSR and I’m good to go. In my case of selecting the SSR the risk is small, but predictable is preventable.
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Use a plastic project box
https://www.amazon.com/Yosoo-100x60x25mm-Electronic-Enclosure-Instrument/dp/B019GFLNV4/ref=sr_1_1?ie=UTF8&qid=1498253940&sr=8-1-spons&keywords=project+box&psc=1
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No manual overide with iot… with my box I control everything super easy when I’m done main power kills everything. I can switch my light of when I’m not standing over the machine watching… I love my control box it’s safe because before I stick my hands in the cabinet I kill spindle power.
A3 Coolant Enable M8 (flood)
A4 Mist Enable M7 (config.h parameter change if not already enabled)
M9 both off
Not sure what you are asking. They are TTL outputs ( on / off ). M7 pin A4 5 volts. M8 pin A3 5 volts. M9 pin A3 and A4 0 volts.
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Blame it on the demon. He’s asleep.
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That´s a Highway to Hell
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I got my X carve and I set it up but it stay on connecting to x carve and want proceed