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Line impedance query

me1899
Hi 


I am looking at a job where a supply to a replacement CT scanner has to be calculated.


The current scanner is fed by a cable with line impedance 0.06 at source end of the sub panel that feeds it.


The new scanner must have a line impedance no more than 0.06 so basically I can't use the way on the current panel.


The client engineer has said to run from the intake and provide a cable calc to prove the line impedance is OK for the new scanner feed (this is D and B).


I am using AMTECH and was wondering if there was a way to output line impedance or if I need to show a calculation another way?


The client engaged a firm to do line impedance tests, and their report shows values measured between L1-L2, L2-L3 and L1-L3, but looks like they did testing at the sub panel and not at the intake.


This is basically like PSCC right? So I can get PSCC from AMTECH, divide by root 3 and work out impedance from there?


Am I on the right track? Assistance would be much appreciated.


Regards


Anisur
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  • Former Community Member
    0 Former Community Member
    John Peckham:

    OMS


    Is this line impedance the impedance of one line conductor or 2 line conductors?


    I know the top man in the country for Medical Locations. I will see if I can get him to comment on this post. 


    Well, typically HTM 06-01 indicates that it is measured between one or more lines as required. Obviously, depending on the source of the equipment, manufacturers may state specific requirements (eg, some GE kit may be assuming a delta supply source)


    I can't specifically state that, John - read the instructions would be good advice.


    Regards


    OMS


     


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  • Former Community Member
    0 Former Community Member
    John Peckham:

    OMS


    Is this line impedance the impedance of one line conductor or 2 line conductors?


    I know the top man in the country for Medical Locations. I will see if I can get him to comment on this post. 


    Well, typically HTM 06-01 indicates that it is measured between one or more lines as required. Obviously, depending on the source of the equipment, manufacturers may state specific requirements (eg, some GE kit may be assuming a delta supply source)


    I can't specifically state that, John - read the instructions would be good advice.


    Regards


    OMS


     


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