Incorrectly sized lugs on busbars

I agree with the sentiment above, and would add that the correct size is readily available from reputable vendors. Indeed long-palm lugs are M12 and might be what the transformer manufacturer was allowing for.


I will admit to using spreading washers plus Belleville washer etc to terminate M12 lugs onto M10 final circuit equipment where there wasn’t a small enough bimetallic lug available, but this has only occurred with the express written approval of both the equipment and lug manufacturers and the cable was under-loaded (oversized due to volt drop), checking the washer dimensions to verify contact areas and a detailed method (torque etc as BOD says) provided to site. I still might not have been comfortable if the termination was expected to run at full load temperatures.

I agree with the sentiment above, and would add that the correct size is readily available from reputable vendors. Indeed long-palm lugs are M12 and might be what the transformer manufacturer was allowing for.


I will admit to using spreading washers plus Belleville washer etc to terminate M12 lugs onto M10 final circuit equipment where there wasn’t a small enough bimetallic lug available, but this has only occurred with the express written approval of both the equipment and lug manufacturers and the cable was under-loaded (oversized due to volt drop), checking the washer dimensions to verify contact areas and a detailed method (torque etc as BOD says) provided to site. I still might not have been comfortable if the termination was expected to run at full load temperatures.