I have read the post of ryan about conduit calculation for serving as GEC, his concern is about NEC and the replies are quite convincing,my only concern is this, WHY WE HAVE TO USE CONDUIT AS REPLACEMENT AND NOT TO RUN GROUND CONDUCTOR ITSELF.
As for safety reason we can not rely that conduit pipes are 100% connected to each other, there might be loose connection in between which could result to high resistance.sometimes if it really need to use conduit pipe as grounding it is necssary to weld the joint(the coupling etc)to make effective and have no loose connection.
Secondly, i would stress that this is part of equiptment grounding and therefore consider secondary means of grounding and not to be serve as primary means.
any comment on this safety matter is highly appreciated.just for the forum only and nothing else.
As for safety reason we can not rely that conduit pipes are 100% connected to each other, there might be loose connection in between which could result to high resistance.sometimes if it really need to use conduit pipe as grounding it is necssary to weld the joint(the coupling etc)to make effective and have no loose connection.
Secondly, i would stress that this is part of equiptment grounding and therefore consider secondary means of grounding and not to be serve as primary means.
any comment on this safety matter is highly appreciated.just for the forum only and nothing else.