SKM arc flash calulcations

[OCPD]

Hello all,

In SKM the arc flash calculations lists the switchboard as equipment type - Panel. I am trying to understand even though the equipment is called switchboard the software treat's them as panelboards ? I know it is the UL and ANSI standard which decides the type since it is bus gap dependent and it can be changed manually. But I am trying to understand why they called switchboard but treated as panelboard.

 

[jim dungar]

Hello all,

In SKM the arc flash calculations lists the switchboard as equipment type - Panel. I am trying to understand even though the equipment is called switchboard the software treat's them as panelboards ? I know it is the UL and ANSI standard which decides the type since it is bus gap dependent and it can be changed manually. But I am trying to understand why they called switchboard but treated as panelboard.

It likely has to do with the construction of the branch/feeder protective device connections. Most switchboard manufacturers simply mount standard panelboard interiors into very large steel enclosures.

 

[steve66]

Hello all,

In SKM the arc flash calculations lists the switchboard as equipment type - Panel. I am trying to understand even though the equipment is called switchboard the software treat's them as panelboards ? I know it is the UL and ANSI standard which decides the type since it is bus gap dependent and it can be changed manually. But I am trying to understand why they called switchboard but treated as panelboard.

I think SKM automatically selects "Panel" with a 25 mm arc gap for any low voltage systems, and "Switchboard" with a 104 mm gap for any high voltage systems. I don't they you can edit these (at least not on my version of SKM, which is an older version.)