Natfuelbilll
Senior Member
Does anyone have a arc flash study that would support the "voltage testing" task of Hazard risk category 1, while working on the load end of a branch circuit fed from a 120/240V panelboard?
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NFPA 70E PPE table for work 240V and below
- Thread starter Natfuelbilll
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- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Natfuelbilll said:Does anyone have a arc flash study that would support the "voltage testing" task of Hazard risk category 1, while working on the load end of a branch circuit fed from a 120/240V panelboard?
I know of no calculation method for determining incident energy of an arc flash on a single phase circuit. My recommendation is to use the "task table" in NFPA70E.
davidr43229
Senior Member
- Location
- Columbus, Oh
Panelboards or Switchboards rated >240 V and up to 600 V
(with molded case or insulated circuit breakers) ? Notes 1
And 3
Work on energized parts, including voltage testing
Hazard/Risk V-rated V-rated Tools
2* Gloves
YES
(with molded case or insulated circuit breakers) ? Notes 1
And 3
Work on energized parts, including voltage testing
Hazard/Risk V-rated V-rated Tools
2* Gloves
YES
Natfuelbilll
Senior Member
The nature of my question is if at the end of a 10' length of say #12 copper, fed from any MVA source, if the Hazard Risk Category is still up there requiring 2*.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Natfuelbilll said:The nature of my question is if at the end of a 10' length of say #12 copper, fed from any MVA source, if the Hazard Risk Category is still up there requiring 2*.
IEEE has no formula to confirm your "hunch".
The present NFPA 70E task tables have an exception for 240V maximum situations where the fault current is less than 10kA. And, it is possible to calculate single phase fault currents.
Natfuelbilll
Senior Member
Actually, IEEE does have their IEEE-1584 and NFPA 70E.
My question is more directed to anybody who has used Arc Flash software, or has results of a study, at the end of a branch circuit.
My question is more directed to anybody who has used Arc Flash software, or has results of a study, at the end of a branch circuit.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Natfuelbilll said:Actually, IEEE does have their IEEE-1584 and NFPA 70E.
My question is more directed to anybody who has used Arc Flash software, or has results of a study, at the end of a branch circuit.
I use arc flash software regularly. I know of no method to give you the answer you want.
Neither IEEE 1584 nor NFPA 70E have any formulae to calculate arc flash incident energy for single phase circuits. If you can not calculate the energy, your only choice is to use the task tables.
Natfuelbilll
Senior Member
Okay, then let's call it a 208V - 3 phase, #12 wire, and whatever source MVA you want.
- Location
- Wisconsin
- Occupation
- PE (Retired) - Power Systems
Natfuelbilll said:Okay, then let's call it a 208V - 3 phase, #12 wire, and whatever source MVA you want.
I chose not to answer this hypothetical situation.
Natfuelbilll
Senior Member
I believe that sometimes looking at the envelope can help get our hands around issues.
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