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Is It Safe to Connect 12V DC Transformer Negative to Chassis Ground With Multiple Batteries?

12 6
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  • #1 21683456
    Devin Byrd
    Anonymous  
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  • #2 21683457
    Maurizio Di Paolo Emilio
    Anonymous  
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  • #3 21683458
    Devin Byrd
    Anonymous  
  • #4 21683459
    Giovanni Di Maria
    Anonymous  
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  • #5 21683460
    younger cooker
    Anonymous  
  • #6 21683461
    sus college
    Anonymous  
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  • #7 21683462
    Sambath Kumar
    Anonymous  

Topic summary

The discussion addresses the safety and best practices of connecting the negative terminal of a 12V DC transformer to chassis ground in a system with multiple batteries also grounded to the chassis. It is generally acceptable to connect the negative DC side of the transformer to chassis ground, especially on the secondary (12V) side, to provide a common reference point for control circuits. However, grounding the primary side of the transformer to chassis is unsafe due to the risk of connecting live AC phases to the chassis. In systems with multiple batteries wired in series-parallel and grounded to chassis, all negative supplies can be tied together and connected to chassis ground. A recommended practice includes connecting all negative supplies together and using a resistor (e.g., 33 ohms, 5 watts) between the negative supply point and the transformer body, which is then grounded to earth, to limit fault currents and provide safety. The control board in the system uses chassis ground as its reference, so proper grounding of the 12V negative line is necessary for correct operation.
Summary generated by the language model.
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