The 1584 also lists a caveat to the 2s statement regarding how quickly a person exposed to the event is able to “move”. This maybe should not be applied across the board but only in special cases where it is assumed to apply.
Wbd:
The integrated method is described in the Easy Power help if you open the help from the arc flash options page. There is a help button near the lower right corner. Click here and scroll down. It’s a small blurb but it does describe how it works. If you take the advise above and try a...
It appears that the sub pdc has a trip device that is not protecting the main pdc. The two buses probably do not have the same trip device (and therefore trip time) used in the calculation. Are you able to send your one-line to their technical support for an explanation?
Can anyone point me towards a reference or thread that explains how to find available fault current on the secondary side of an open delta bank? I have a 75kva and a 37kva open delta bank and would just like to calculate available kA.
Thanks
Please correct me (anyone) if this is too simplistic or down right incorrect:
The system contains inductance which stores a charge. In the case of a fault, the inductance contributes energy in the form of DC current. As with any stored charge / energy, this decays according to a time constant.
How do you calculatie motor short circuit contributions? I know that C37.010 and 013 give impedance multipliers. For a 100hp motor the first cycle calc is 1.2*Z" but how does this translate into a short circuit current? Doesn't the motor kV come into play?
