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Old 12-18-2011, 11:47 AM   #1
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Relays as they relate to NEC standards


To those of you that know the NEC code better than I, I have a few specific questions.

My installation pertains to 2005 NEC, but I suppose following the standard of the newer(2008) or newest(2011) wouldn't hurt either.

I'm wanting to use a low voltage(24vac or 12vdc) switch to control a 120VAC load via a relay.

NEC 725.136 (D) (1) mentions 1/4" separation.

  1. "blade" style relays - Pretty sure this is a big NO.
  2. RIB2421B, which also has a nice range of options(Low voltage AC/DC coil, 120VAC coil, 277V coil with NO and NC contacts)
  3. The seemingly popular Amprobe rc 120s. This completely eliminates the low-volt and high-volt wiring occupying the same box. They are a bit pricey and the cost adds up quickly.
Examples of all 3:
  1. http://www.amazon.com/Dayton-1EHR8-R...4230282&sr=8-5
  2. https://www.hvacusa.com/store/power-...21b-p-90090425
  3. http://www.amazon.com/Amprobe-RC-120.../dp/B0029XOKH0
Would #2 fall under NEC?


Any article references would be appreciated!


Thanks

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Old 12-18-2011, 12:25 PM   #2
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Relays as they relate to NEC standards


Found a few others that shouldnt be an issue:

http://functionaldevices.com/pdf/dat...CLC212-D15.pdf
http://functionaldevices.com/pdf/datasheets/CLC212.pdf
http://functionaldevices.com/pdf/dat...106_SERIES.pdf

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Old 12-18-2011, 01:35 PM   #3
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Relays as they relate to NEC standards


For vehicles they are called "solenoids" and are designed to be mounted on a firewall or plugged into a fuse box.

In electronics they are called "relays" and are designed to be mounted on a printed circuit board and soldered.

In the "electrical world", they are called "contactors" and are designed to be mounted in an electrical box and have screw terminals to connect wires.

Search for the word: contactor
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Old 12-18-2011, 04:59 PM   #4
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Relays as they relate to NEC standards


The NEC doesn't "regulate" relays. If the relay is listed for the application by the manufacture then you can use it.
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Old 12-18-2011, 07:49 PM   #5
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Relays as they relate to NEC standards


Quote:
Originally Posted by a7ecorsair View Post
The NEC doesn't "regulate" relays. If the relay is listed for the application by the manufacture then you can use it.
Okay, thanks. That answers my main question.

the CLC212 seems to be the perfect application, plus it's an average of $15 cheaper than the amp-robe AND it's available in a NC configuration so I can use the more common configuration of magnetic door sensors
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