Good Day,
My company is in the process of having an arc flash study performed for the facility. However, in the meantime, we were hoping that Table 130.7(C)(15)(a) could be used as a guide for work on energized equipment until the study is completed. However, I would like some clarification of parameters described in the table, to be more specific, "Potential arc flash boundary with exposed energized conductors or circuit parts". What exactly is considered an exposed energized conductors and circuit parts? Are termination points considered as exposed? What about the insulated conductors i.e. not bare? Is it possible that based on the construction of some switchgear that there are no exposed conductors/circuit parts and as such this parameter is not applicable? We have Cutler Hammer Freedom 2100, Cutler Hammer Ampgard Medium Voltage Starters and the 15kV Metal Clad switchgear from Cutler Hammer. Finally, has anyone used this table in that way? i.e. in lieu of a study. If so, any advice? Besides the exposed conductors in the parameters, some of the short circuit current values and clearing times quoted vary from what we have on our facility.
My company is in the process of having an arc flash study performed for the facility. However, in the meantime, we were hoping that Table 130.7(C)(15)(a) could be used as a guide for work on energized equipment until the study is completed. However, I would like some clarification of parameters described in the table, to be more specific, "Potential arc flash boundary with exposed energized conductors or circuit parts". What exactly is considered an exposed energized conductors and circuit parts? Are termination points considered as exposed? What about the insulated conductors i.e. not bare? Is it possible that based on the construction of some switchgear that there are no exposed conductors/circuit parts and as such this parameter is not applicable? We have Cutler Hammer Freedom 2100, Cutler Hammer Ampgard Medium Voltage Starters and the 15kV Metal Clad switchgear from Cutler Hammer. Finally, has anyone used this table in that way? i.e. in lieu of a study. If so, any advice? Besides the exposed conductors in the parameters, some of the short circuit current values and clearing times quoted vary from what we have on our facility.