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Thread: Flame sensors

  1. #14
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    29,213
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    It is important to remember that a current flow (which is what happens in flame rectification) requires a complete circuit. The "ground" connection to the burner shell, however indirect that connection is, can cause a failure when that connection is lost. It causes the circuit (from the Latin, to "go around") to have a break in its continuous nature. I use quotation marks around the word "ground" because it is only called a ground here because the chassis of the appliance is tied to one side of the electrical source, and the old metal chassis radios and TV's got us into the habit of referring to the chassis potential as "ground," because the units that connected to broadcast antennas required the chassis to also be connected to an earth ground to complement the non-grounded antenna array.

    Today, that connection is for safety, and all electrical appliances are required to have an independent Equipment Grounding Conductor that connects (or "bonds") the sheet metal parts of an appliance to the grounding buss bar at the main panel. This connection assists the overcurrent device in opening in the event of a fault.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
    Member, IAEI

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  2. #15
    Join Date
    Oct 2016
    Posts
    7
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    Thread Starter
    Thanks for all the responses, that’s the answers I was looking for and couldn’t find anywhere else.

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