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    Old Doran Smith 3871 mcb and how to determine type and Zs

    Hi electricians, can any one let me know how you can tell which type the old doran smith 3871 mcbs are as I can,t see a 1 ,2, or c or three on em? and what is the max Zs value for them as I can,t see it in the regs? so how can you know whether they are within the disconnection times permitted...
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