Arc Flash Study - When needed and when not needed
- Thread starter MPdesign
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petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
I think it is needed in every non-residential setting.
It is probably not needed for most common single family homes, but larger apartment buildings might well have some substantial arc flash potential. maybe a judgement call on the part of the engineer involved.
So are you saying this includes every:
1) Nail salon in a strip shopping center in the usa - even though they rent the space and are responsible for the panel themselves
2) All 5 of farmer Johns remote sheds that have a panel
3) The sign along the road that has it's own feed because it was too far from the building.
Is that right? It doesn't seem right.
And where and who is really enforcing it for all of the shopping center nail salons around the nation?
Who is actually writing existing buildings up for this?
Thank you! I appreciate the insight.
1) Nail salon in a strip shopping center in the usa - even though they rent the space and are responsible for the panel themselves
2) All 5 of farmer Johns remote sheds that have a panel
3) The sign along the road that has it's own feed because it was too far from the building.
Is that right? It doesn't seem right.
And where and who is really enforcing it for all of the shopping center nail salons around the nation?
Who is actually writing existing buildings up for this?
Thank you! I appreciate the insight.
mayanees
Senior Member
- Location
- Westminster, MD
- Occupation
- Electrical Engineer and Master Electrician
AF requirements
AF requirements
Look at 110.16
.. panels in other than dwellings that are likely to require examination while energized...
I don't think arc flash labeling is being enforced much, but it's a natural byproduct of a Coordination Study which develops fault currents and breaker settings.
But all you need to say is that something will never be accessed while energized and it doesn't need a label.
AF requirements
Look at 110.16
.. panels in other than dwellings that are likely to require examination while energized...
I don't think arc flash labeling is being enforced much, but it's a natural byproduct of a Coordination Study which develops fault currents and breaker settings.
But all you need to say is that something will never be accessed while energized and it doesn't need a label.
- Location
- Illinois
- Occupation
- retired electrician
The requirements in 110.16 require nothing more than a generic arc flash warning label...no studies required.
The rule in 110.24 requires marking the service equipment with the available fault current so you do need to get some information from the utility and maybe do a calculation to get the available current at the service equipment, but still does not require an arc flash hazard study.
There is nothing in the NEC that requires the arc flash study, that is required by the electrical safe work rules.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
"...the electrical safe work rules"
That is, most often OSHA and NFPA 70E, although employers have the option of adopting or creating other programs. Not cost effective (development and risk management) except for very large companies.
That is, most often OSHA and NFPA 70E, although employers have the option of adopting or creating other programs. Not cost effective (development and risk management) except for very large companies.
Arc Flash
Arc Flash
A. Any 3 phase equipment
B. Any single phase equipment that is over 1.2 cal
C. OSHA.. States Everyone by Jan 1,2015
D. Problem is when you do data collection you have to have all equipment collected because you don't know untill the study is completed
where 1.2 cal starts. (it could possibly be in single phase equipment.)
E. Hopefully you have any updated one line diagram.
F. They also state that energized electrical maintinance needs to be performed annually and every 3-5 years a De Energized maintinance to be performed. (tight torque clean and exercise equipment.
Hope this helps
Chris
Arc Flash
A. Any 3 phase equipment
B. Any single phase equipment that is over 1.2 cal
C. OSHA.. States Everyone by Jan 1,2015
D. Problem is when you do data collection you have to have all equipment collected because you don't know untill the study is completed
where 1.2 cal starts. (it could possibly be in single phase equipment.)
E. Hopefully you have any updated one line diagram.
F. They also state that energized electrical maintinance needs to be performed annually and every 3-5 years a De Energized maintinance to be performed. (tight torque clean and exercise equipment.
Hope this helps
Chris
greenspark1
Senior Member
- Location
- New England
Ditto. Note that 110.24 was added in the 2011 NEC so it may not be enforced or familiar to many people.
kingpb
Senior Member
- Location
- SE USA as far as you can go
- Occupation
- Engineer, Registered
You never need to as long as the plan is to never work on anything hot.
If you do one, in general, nothing below 480V needs to be considered; unless you have OCD.
If you do one, in general, nothing below 480V needs to be considered; unless you have OCD.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Well, in some cases OSHA considers just operating large breakers to require arc flash PPE if you do not do a study.
So, call POCO to disconnect service so that you can open your main breaker.
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