There continues to be a great deal of activity surrounding the update to NFPA 70E scheduled to be published in October 2008. For the proposed 2008 edition of NFPA 70, National Electrical Code® (NEC®), the Technical Correlating Committee (TCC) received 3,668 propo sals and 3,206 comments during the revision cycle. For those of us involved in working with energized electrical circuits best thermographic camera the outcome of the new standards will likely impact how we do our job. The goal is to increase safety through well-thought-through practices.
How is Thermographers Addressing the Issue?
Increasing the distance at which inspections of open cabinets are performed.
New Language Being Drafted by NFPA and ASTM
ASTM E-1934
A new language is being proposed in the next version of ASTM E-1934, Standard of Examining Electrical Power Distribution Equipment with Infrared Technology. 7.5 - As an alternative, consideration may be given to conducting the examination through "windows" that are transparent to detected infrared radiation or to "ports." Safety procedures should be modified to accommodate this task. Care must be taken to insure that all equipment can be seen and special lenses may be required.
Did You Know?
Incident energy from an arc flash created with vertical, unterminated conductors in a cabinet (20" x 20" x 20") decreases by the inverse of the distance to the 1.5 power. If the arc has horizontal conductors that point out of the cabinet opening or vertical which terminate into an insulated barrier, the exposure may decrease by a lower exponent, but not enough data has been collected on these conductor configurations. - Tom Neal of Neal Associates
Next Revision of NFPA 70E
The following new language has been submitted to, and is being considered, by the 70E committee: "When access to conduct such inspections of energized equipment is limited by the appropriate use of special windows or small access ports, rather than by gaining access though opening the enclosure door, the limit of the approach, and the required PPE, will be the same as if the enclosure door were left unopened."
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