MBSOLIS
11-21-2009, 03:38 PM
The 2009 NFPA 70E introduced new terms that relate to the electrical hazards, “Limited”, “Restricted”, and “Prohibited Approach Boundary” for shock protection. If you read page 25, these new terms “Limited”, “Restricted”, and “Prohibited Approach Boundary” , these are shock protection boundaries and are not related to Arc Flash or Incident Energy.
The standard, see page 24, also identifies the “Flash Protection Boundary” that must be established in order to protect employees from the arc-flash hazard.
These protection boundaries are identified by NFPA 70E, Section 110.8(B)(1), “Electrical Hazard Analysis.” This section along with Sections130.2 and 130.3 provide the requirements for performing the “Electrical Hazard Analysis” with emphasis on the “Shock Hazard Analysis” and the “Flash Hazard Analysis”.
Based on this, question??
1) Do we need to differentiate Arc Flash Hazard Analysis from Shock Hazard Analysis. The Shock Hazard Analysis applies to 50V or more and Arc Flash Analysis shall apply to >240Volts and servicedby >125 kVA transformer.
Example: A 240v panel feed by a less than 75 kVA transformer requires a Shock Hazard Analysis but not Arc Flash Analysis
A 120/208 MDP feed by a 125 kVA and larger requires both Shock Hazard Analysis and Arc Flash Hazard Analysis.
The SKM can print all the results of the arc flash and shock hazard analysis, but there is enough space in the label, if you include the line and load side arc flash boundary, PPE, Ei info in a switchgear or panelboard?
2) In that case, do you need a separate individual label for arc flash and shock hazard?
The standard, see page 24, also identifies the “Flash Protection Boundary” that must be established in order to protect employees from the arc-flash hazard.
These protection boundaries are identified by NFPA 70E, Section 110.8(B)(1), “Electrical Hazard Analysis.” This section along with Sections130.2 and 130.3 provide the requirements for performing the “Electrical Hazard Analysis” with emphasis on the “Shock Hazard Analysis” and the “Flash Hazard Analysis”.
Based on this, question??
1) Do we need to differentiate Arc Flash Hazard Analysis from Shock Hazard Analysis. The Shock Hazard Analysis applies to 50V or more and Arc Flash Analysis shall apply to >240Volts and servicedby >125 kVA transformer.
Example: A 240v panel feed by a less than 75 kVA transformer requires a Shock Hazard Analysis but not Arc Flash Analysis
A 120/208 MDP feed by a 125 kVA and larger requires both Shock Hazard Analysis and Arc Flash Hazard Analysis.
The SKM can print all the results of the arc flash and shock hazard analysis, but there is enough space in the label, if you include the line and load side arc flash boundary, PPE, Ei info in a switchgear or panelboard?
2) In that case, do you need a separate individual label for arc flash and shock hazard?