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modelling conductor bus rail - like for a crane
https://brainfiller.com/arcflashforum/viewtopic.php?f=23&t=5638		 Page 1 of 1
Author:  BGnan [ Fri Dec 09, 2022 8:27 am ]
Post subject:  modelling conductor bus rail - like for a crane
Attachment:
Conductor_Bar_2-updated.png
Conductor_Bar_2-updated.png [ 86.85 KiB | Viewed 2415 times ]


Any suggestions or experience modeling conductor bus bar / rail system used for mobile equipment - e.g. a hoist or crane - see photo above.

Horizontal Electrodes in Open Air - HOA? Even though the a large percentage of the bus is insulated (but would melt away during an AF incident).

Thank you for your thoughts!

Attachments:
Cat_02a_US_Insulated_Conductor_System_U10_Rev03.pdf [2.53 MiB]
Downloaded 361 times
Author:  BGnan [ Wed Dec 14, 2022 6:24 am ]
Post subject:  Re: modelling conductor bus rail - like for a crane
And more importantly - what to do about there being no enclosure other than a back wall to focus/direct the energy?
Author:  jmoore284@gmail.com [ Wed Dec 14, 2022 12:00 pm ]
Post subject:  Re: modelling conductor bus rail - like for a crane
In what scenario is someone exposed to a possible arc flash event on these conductor rails? These are elevated and in my experience personnel are unable to get near them while performing any standard work task. A risk assessment would then identify the chance of exposure as none and therefore no arc flash hazard needs to be identified.

With that said, I have modeled crane rails many times to determine the arc flash hazard at the control panels located on the crane deck. One customer had several 100T cranes with rails spanning hundreds of feet and with multiple points at which the rails could be energized. I modeled each accurately and identified the point at which the crane could be positioned and the worst case arc flash hazard associated with it.
Author:  BGnan [ Fri Dec 16, 2022 5:24 am ]
Post subject:  Re: modelling conductor bus rail - like for a crane
jmoore284@gmail.com wrote:
In what scenario is someone exposed to a possible arc flash event on these conductor rails? These are elevated and in my experience personnel are unable to get near them while performing any standard work task. A risk assessment would then identify the chance of exposure as none and therefore no arc flash hazard needs to be identified.

With that said, I have modeled crane rails many times to determine the arc flash hazard at the control panels located on the crane deck. One customer had several 100T cranes with rails spanning hundreds of feet and with multiple points at which the rails could be energized. I modeled each accurately and identified the point at which the crane could be positioned and the worst case arc flash hazard associated with it.


That is what I want to do - to know the hazard at different points since even for LOTO and deenergized work proper PPE must be known/prescribed. Which electrode configuration did you use? Thank you for replying.
Author:  BGnan [ Sun Dec 18, 2022 11:46 am ]
Post subject:  Re: modelling conductor bus rail - like for a crane
I believe I was overthinking (or under-thinking) this - seems this is clearly a HOA application out of all the options.
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