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Supplementary equipotential bonding in group 2 medical locations

Former Community Member
Former Community Member
Hi All,

I'm new here and a trainee electrical engineer. 


I am looking for pointers on how to calculate the CSA of equipotential bonding conductors in group 2 medical locations.


Having worked on site, I know that as a standard we use 4/6mm to allow us to stay within the 0.2Ohms resistance but would like to know the theory behind it so I can include this calc in my designs to prove where the result have come from when or if ever questioned.


Thanks,

Sam
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  • Former Community Member
    0 Former Community Member
    If i do the calc based off the Medical Design Guide with an Ia of 200 


    0.2 x 200 = 40v which isn't permissible as it is greater than 25V.


    so to find the impedance needed to maintain the 25V do Ra = 25V/200 = 0.125Ohms 


    So then to find the CSA im assuming ohms law to get I = 230 x 0.125 = 28.75A.


    Then doing the adiabatic equation for CSA i get 0.034?
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  • Former Community Member
    0 Former Community Member
    If i do the calc based off the Medical Design Guide with an Ia of 200 


    0.2 x 200 = 40v which isn't permissible as it is greater than 25V.


    so to find the impedance needed to maintain the 25V do Ra = 25V/200 = 0.125Ohms 


    So then to find the CSA im assuming ohms law to get I = 230 x 0.125 = 28.75A.


    Then doing the adiabatic equation for CSA i get 0.034?
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