This guide will provide an explanation on all the major changes that have been implemented in new NFPA (National Fire Protection Agency) 70E 2018 edition.
If you are familiar with the concept of Arc flash studies, then you must also know the significance of Arc flash labels in your facility and the ramifications of an arc flash.
So, what exactly is the information that is no longer required in Arc flash labels?? Read the article to learn more about it!
After several revisions, NFPA launched the 2018 version of NFPA 70E as an evolution of electrical safety. This new edition of NFPA 70E include several updates, including changes to the Arc flash tables, electrical safety and maintenance planning, the hierarchy of risk controls, conformity assessment of PPE, and Risk Assessments.
Before going into the details of the first major change, Let's first get up to speed on the minor change related to the definition of Arc flash boundary.
The revised definition of arc flash boundary no longer uses the term "Second degree burn" Instead, "Arc flash hazard exists when incident energy equals 1.2 cal/cm2 " – "Second degree" has been replaced by the term "Stoll skin Burn".
As per the new edition of NFPA 70E 2018, It is clearly mentioned that only one of the following two methods can be used for the selection of Arc flash PPE, but not both at the same time.
a: The incident energy analysis method
b: The Arc flash PPE category method.
In earlier editions of the standard, the PPE Category method contained a table that specified whether the particular arc flash PPE was required based upon a list of common tasks on each specific equipment.
However, with the addition of the new NFPA 70E, the appropriate method to protect the worker might not be PPE category tables as previously emphasized. Most users preferred to use the PPE Category "Yes/No" tables and the values determined for incident energy — a practice that NFPA 70E specifically prohibited. This confusion was discussed at length by the committee of NFPA members, and the result is a new Table 130.5(C).
However, it should be noted that this table no longer tells the user whether arc flash PPE is required or not? In a format of "Yes/No". Rather, this new table helps in determining if additional measures are needed to protect workers by specifying whether an arc flash is likely to occur for given tasks.
The arc flash PPE method should only be used if an incident energy analysis has not been conducted. On the flip side, if an incident energy analysis has been performed, the estimated incident energy exposure to the worker is calculated and an arc flash hazard warning label is applied to the equipment.
In 2018 NFPA 70E edition, Incident energy levels have been changed and categorized into the levels of A, B, C and D.
Purchasing the right PPE (Personal Protective Equipment) has always been a challenge for companies or those individuals responsible for making such decisions in their electrical facilities.
To address the issue, the NFPA 70E standard has proposed to utilize the ANSI/ISEA 125-2014 national consensus standard for conformity assessments of safety and personal protective equipment in its 2018 edition.
This conformity assessment provides an organized and systematic way for a supplier to verify that a product meets the requirements of a performance standard, communicating verification to the purchaser and user.
Another major change to NFPA 70E 2018 edition was the addition of Table 130.5(C). This table states that:
"On electrical equipment in any condition (normal or abnormal), performing infrared thermography and other non-contact inspections outside the Restricted Approach Boundary does not increase the likelihood of occurrence of an arcing fault and arc flash incident"
The bottom line is that as per the new statement, you would not require additional PPE to perform infrared thermography. However, the table further clarifies that this does not include opening equipment or SWGR (Switchgear) doors or covers that expose energized conductors, which specifically increases the likelihood of the occurrence of an arcing fault and arc flashover.
Restricted Approach Boundaries on AC systems are further defined in Table 130.4 (D)(a) and are;
1'-0" for 151-750V AC systems
2'-2" on 751-15,000V AC systems.
The images are referenced from the article "NFPA 70E 2018 Edition Changes will Impact Electrical Maintenance Procedures" by Author Rudy Wodrich
To summarize, the above mentioned changes are the ones related specifically to arc flash studies. Other changes shall be covered in a separate article in the future.
Though, facility owners and managers are encouraged to take the following steps to get their your facility up-to-date with the 2018 NFPA 70E.
1. Ensure all the "qualified workers" have access to the 2018 NFPA 70E standard.
2. Ensure that your electrical safety and maintenance program is up to date with the latest requirements of the NFPA 70E 2018.
3. Schedule on-site NFPA 70E electrical power safety or Arc flash training for all employees. They shall be trained to identify and understand the relationship between electrical hazards and possible injury.
Furthermore, The ANSI/ISEA 125-2014 makes it easy for PPEs manufactures to meet some performance standard and makes it easy for them to communicate this verification to end users. It also standardizes requirements for initial and ongoing testing, process quality, record, and surveillance management, and declaration of conformity. Furthermore, the standard offers alternative methods of conformity assessment.
Only qualified personnel shall be allowed to perform maintenance work and they shall be required to complete a Job Safety Analysis (JSA) before commencing work. As per the article 110.1 of new NFPA 70E 2018 edition, it is clearly mentioned that;
"A qualified person will also need to complete a Job Safety Analysis (JSA) before work or troubleshooting is performed. That JSA would require such "qualified person" to:
Identify all tasks associated with the performance of the job
Identify all specific hazards with each task
Determine the severity and likelihood of unintentional injury for each task
Identify what control measures can be used to reduce injuries.
With the new Arc flash label requirements, it is incumbent for you to make all necessary changes in your facility to ensure full compliance with NFPA 70E 2018.
Electrical Facility owners must know the consequences of not implementing the new changes as proposed in the new edition of NFPA 70E 2018.
About The Author
Abdur Rehman is a professional electrical engineer with more than eight years of experience working with equipment from 208V to 115kV in both the Utility and Industrial & Commercial space. He has a particular focus on Power Systems Protection & Engineering Studies.