Arc Flash Hazard labeling
Arc Flash Hazard labeling
(OP)
Hi,
I'm perfoming an arc flash hazard analysis to a facility which is a data center. After giving them the results they came up with a series of requests. They want me to label each ATS's, disconnect switches and transformers. I know that NEC 110.16 and NFPA 70E 400.11 requires to label switchboards, panelboards, MCC's, meter sockets and industrial control panels... but I have not found anywhere that I need to label the requested equipment. Also, the program that I use (SKM-PTW) does not give me the option for these labels.
What should I do, reply to them that I cannot do it or should I define a bus for each ATS, disconnect and tx to get the labels?
Hope anyone can help me and thank you in advance,
chelin
I'm perfoming an arc flash hazard analysis to a facility which is a data center. After giving them the results they came up with a series of requests. They want me to label each ATS's, disconnect switches and transformers. I know that NEC 110.16 and NFPA 70E 400.11 requires to label switchboards, panelboards, MCC's, meter sockets and industrial control panels... but I have not found anywhere that I need to label the requested equipment. Also, the program that I use (SKM-PTW) does not give me the option for these labels.
What should I do, reply to them that I cannot do it or should I define a bus for each ATS, disconnect and tx to get the labels?
Hope anyone can help me and thank you in advance,
chelin






RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
Have you ever opened up an "ASCO" type ATS? Much scarier inside than any switchboard I've ever seen.
There is nothing in NFPA 70E that restricts what can be labeled.
As David says, you just need to add a bus upstream of each device.
RE: Arc Flash Hazard labeling
The SKM version is 6.0.... but I haven't found how to label other equipment than buses. The only way would be (for what I know) adding a bus instead of the equipmnet (Ats, disconnect, etc...)
RE: Arc Flash Hazard labeling
For instance, an ATS would have three buses, Normal, Emergency, and Load, all of which could have different Arc Flash energies. You would have the transformer primary and secondary buses, and the bus to which the switch is connected, etc.
RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
RE: Arc Flash Hazard labeling
My question is for the bus: If for example I have a disconnect switch and I need a label for it, I need to put a bus (which shows up upstream when I put a disconnect in the oneline), Do I need to define the equipment ratings for that bus or not?
RE: Arc Flash Hazard labeling
If you are also running a short circuit study, you will need to input the Short Circuit rating of the bus if you want to analyze the adequacy of the bus momentary ratings.