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Old 11-20-2013, 10:40 PM   #21
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SSR leakage is in the microamp range. You must be especially sensitive.
I bet we would all be sensitive to SSR failure closed.
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Old 11-20-2013, 11:46 PM   #22
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Safety aside, if an SSR fails closed and it causes you to dry fire a $25 element, you'll be pretty pissed that you didn't spend the $12 on a contactor.

http://www.elecdirect.com/product/36be3f29-8580-4e63-9c60-d86c6334dccf.aspx

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Old 11-21-2013, 01:13 AM   #23
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It's understood that we are for the most part hobbyists and DIYers putting these panels together.

But keep in mind you would not be able to purchase a commercially marketed control panel unless it had some engineered safety controls like a simple line-disconnect-contactor.

Features like this are engineered into equipment to keep users alive and keep their property from burning down.

A commercial panel couldn't get agency certification and wouldn't be available for sale if those features weren't there.

It just makes sense to build your gear so its reasonably safe to use.

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Old 11-21-2013, 02:11 AM   #24
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You dispute all three? From your text, it appears to me that you are agreeing with me.
Sorry, too much homebrew mixed with typing the other day. I agree with all three points.

But I shouldn't be harping safety too much. My electrical controls are attached to a piece of plywood hung on my three tier brew stand in the basement. It was all in the open until my wife made me build a frame around it & hang a cabinet door on the frame with a lock to keep the kids from touching. But it's still all open when I have the door unlocked & open to brew.

But I do have a incoming disconnect for safety......
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Old 11-21-2013, 02:37 AM   #25
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I bet we would all be sensitive to SSR failure closed.
Poster was claiming electrocution due to SSR leakage, not SSR failure.
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Old 11-21-2013, 02:44 AM   #26
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Quote:
Originally Posted by Bobby_M View Post
Safety aside, if an SSR fails closed and it causes you to dry fire a $25 element, you'll be pretty pissed that you didn't spend the $12 on a contactor.

http://www.elecdirect.com/product/36be3f29-8580-4e63-9c60-d86c6334dccf.aspx
Fair enough Bobby but the main reason SSRs fail is overheating and that can happen whether or not you have a contactor switching the circuit.

Treat them right and an SSR will last much longer than an electromagnetic relay.
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Old 11-21-2013, 04:38 AM   #27
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Well, just in case I wasn't clear on my angle, I'm talking about shutting the element off due to wanting to fully drain the vessel. If you rely only on the PID, such as dropping the setpoint below ambient or setting to manual and 0% output as a means to prevent dry fire, an SSR failure can result in a dry fire situation. With liquid in there, you may have missed it. I guess there are a lot of separate reasons why, but I think we all agree that a secondary and confirmable disconnect of power from the elements is more than practical.

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Old 11-21-2013, 04:38 AM   #28
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Quote:
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SSR leakage is in the microamp range. You must be especially sensitive.
My line of work is industrial electric.

That 480V is just laying there . . . . . in wait. Like a sniper. Just waiting for you to mess up.

240V is a little more bearable I guess.

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