Arc Flash Labels

[R_Roc]

When you print Arc Flash Labels it's typically in the Normal/Utility configuration?
In my project I also have Standby Generator as well. I don't think they would want
two Arc Flash labels.

Ronne

 

[jghrist]

If you use only one label, it should be for the configuration that gives the highest incident energy.

 

[ciy]

Usually, you need to develop two scenarios, one for Utility and the other one for Generator.

Then find the worst case to print on label.

 

[wbd]

X2 on the worst case incident energy goes on the label. This is common as if there are ATS and autostart on the gensets, you don't want someone working in lesser PPE. Typically the gensets will result in higher IE than the utility source.
Now if the genset is locked out, then lower PPE than indicated on label could be used. This would all be part of a job hazards analysis and pre-job briefing.

 

[R_Roc]

Thanks. If the generator is needed the client has to manual switch it on.
Also the Generator is normally locked out. I will investigate which case
gives me the highest IE.

 

[wbd]

RRoc...I hope I wasn't confusing in my reply. The labels should worst case, which usually is the gensets, and the report should contain a table showing what the values are with the utility as a source. Then this table used for job planning. For example if the genset has a value of 23 cal/cm2 and the utility has a value of 9 cal/cm2 it would be more comfortable to work in the 9 cal PPE