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Old 12-24-2017, 09:08 AM   #1
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Default 240v heater bypass

Hey there, I wired up a couple 240v heaters using a low voltage thermostat and relay that I had kicking around instead of buying a line voltage thermostat. I also have a 240v wifi relay that I have here and I want to hook it up to my google home. So the idea is, the heater works as programmed by the low voltage thermostat but if I want to bypass the thermostat I can trigger the wifi relay to bypass. My question is, would there be any issues if the wifi relay was on, and the thermostat kicked on after for some reason. I know each line would be the same voltage potential so I feel like it should be ok, and it would almost be like you were running the wires in parallel, but I just wanted to get a second opinion in case there was some issue with the current taking the path of least resistance and having the circuit not function properly. I've included a picture of the circuit drawn as it currently is:

i.imgur.com/YYHQRXb.png



And here is what I'd like to do:

i.imgur.com/3hfhyou.jpg


Thanks for any help!!
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Old 12-24-2017, 11:29 PM   #2
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Why are there this kind of entry’s on an electrican chat board


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Old 12-24-2017, 11:34 PM   #3
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No safety problems
all good
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Old 12-25-2017, 02:48 AM   #4
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No safety problems
all good
Thanks!! Merry Christmas

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Old 12-25-2017, 03:15 AM   #5
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I wanna learn more about this electricity takes the path of least resistance malarky.
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Old 12-25-2017, 12:32 PM   #6
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Relay contacts can be paralleled, as many as you want. This way, one or more relays will energize the load.
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Old 12-25-2017, 07:03 PM   #7
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Quote - [ I wanna learn more about this electricity takes the path of least resistance malarky.]

One of many urban myths !
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Old 12-26-2017, 08:32 AM   #8
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Relay contacts can be paralleled, as many as you want. This way, one or more relays will energize the load.
Going to say this is done all the time in control work, not sure why it's a mystery to some.
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Old 12-26-2017, 08:35 AM   #9
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Why are there this kind of entry’s on an electrican chat board


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Maybe because with all the various aspects of electrical work out there everyone doesn't always get the same level of experience across all those niches.

There are many control/instrument guys that can't bend a box offset and many construction guys that can bend a saddle with a rising double offset and no ability to wire up a 3-way switch or install a t-stat in their own house.
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Old 12-26-2017, 08:46 AM   #10
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Maybe because with all the various aspects of electrical work out there everyone doesn't always get the same level of experience across all those niches.

There are many control/instrument guys that can't bend a box offset and many construction guys that can bend a saddle with a rising double offset and no ability to wire up a 3-way switch or install a t-stat in their own house.
This is very true. I've only been in the trade for 2 years as an apprentice and I would normally wire control on the low voltage side but in this situation had an extra 220 volt relay with a wifi controlled coil which is perfect for what I want.

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Old 12-26-2017, 09:18 AM   #11
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This is very true. I've only been in the trade for 2 years as an apprentice and I would normally wire control on the low voltage side but in this situation had an extra 220 volt relay with a wifi controlled coil which is perfect for what I want.

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As long as the relay contacts can handle the load.
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Old 12-26-2017, 05:17 PM   #12
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Mech is right, there are so many aspects to electrical work that you never truly master them all. As you move forward in your career you tend to fall into a niche as you settle in on one area. That's what makes this forum so invaluable, there are people all over the country with different levels of expertise in many different areas. I myself have benefited from just reading the different posts. My career path was mostly troubleshooting and repair of industrial/commercial control and electrical systems. After 35 years in the business I am still learning new stuff. This is what I do so I'm good at it and in high demand, point is that I know the other aspects but may have to question some things. I was always taught you should learn 3 new things a day or the day was a waste to your mind, doesn't matter what. Oh BTW your idea will be perfectly fine as long as contacts are rated for load as was pointed out. Just be sure to watch your phases and remember there will be a back feed on one contactor load side if one or other is energized. I do this arrangement all the time and leave myself tags in case I forget, but I also have several hundred to deal with. Not heaters but are lighting and power controls on EM systems.
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Old 12-27-2017, 06:34 AM   #13
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Mech is right, there are so many aspects to electrical work that you never truly master them all. As you move forward in your career you tend to fall into a niche as you settle in on one area. That's what makes this forum so invaluable, there are people all over the country with different levels of expertise in many different areas. I myself have benefited from just reading the different posts. My career path was mostly troubleshooting and repair of industrial/commercial control and electrical systems. After 35 years in the business I am still learning new stuff. This is what I do so I'm good at it and in high demand, point is that I know the other aspects but may have to question some things. I was always taught you should learn 3 new things a day or the day was a waste to your mind, doesn't matter what. Oh BTW your idea will be perfectly fine as long as contacts are rated for load as was pointed out. Just be sure to watch your phases and remember there will be a back feed on one contactor load side if one or other is energized. I do this arrangement all the time and leave myself tags in case I forget, but I also have several hundred to deal with. Not heaters but are lighting and power controls on EM systems.
Thanks and yeah all contacts are correctly
rated, and I made sure to indicate phase from phase clearly for myself and the next guy when I sell the house.

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Old 12-27-2017, 10:49 AM   #14
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Originally Posted by Ryan_wickens View Post
This is very true. I've only been in the trade for 2 years as an apprentice and I would normally wire control on the low voltage side but in this situation had an extra 220 volt relay with a wifi controlled coil which is perfect for what I want.

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But your profile is misleading your calling yourself an electrician
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