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Mine Grounding M421

Mine Grounding M421

Mine Grounding M421

(OP)
Hi All,

 M421 from CSA, Mining electricity code in canada is not that helpful in clarifying grounding grid design for underground mines. It talks about a GPR of 100 V.

As per MSHA, it is required to have a Safety grid and a substation ground. The three conductors Phase A, B and C come from the substation but the ground comes from another ground grid located more than 25 away from the substation ground. So, that any ground potential rise due to a fault in substation should not creat a rise in potential at the mine ground underground.

Could you kindly advise, if this is how mine grounding is done ?

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