mayanees wrote:
It sounds like you may be working from the 2015 edition which is inappropriate after issuance of the 2018 edition on August 21, 2017.
There is no "expiration" on different editions. There is simply a new edition out there. OSHA's Subchapter S is largely based on a version from 1986 if I recall correctly. NEC adoption is even worse. MSHA only recognizes one section of the NEC from the 1970's and has never advanced since then while state adoption spans the gamut going back over a decade in terms of editions. As a voluntary standard, NFPA 70E has even less standing as far as mandating one version over another. Nothing in any of the editions "expires" older ones. It is up to the end user to decide which editions to adopt.
Second, arc resistant gear can have an arc flash with the doors closed and bolted shut with no severe injury even to someone standing right next to it. So it gets a "no" rating.
Operating breakers whether arc resistant or not stems from the very low failure rates if they are maintained properly. So as an example even though being struck by a meteor is fatal, we do not erect meteor barriers over our places of work simply because the likelihood of occurrence is so low that it is a waste of resources. Similarly properly maintained circuit breakers rarely fail in a way which would cause injury (arcing fault). With very low failure rates, no PPE is required.
As a real world example a chemical plant in North Carolina refuses to maintain their switchgear. As a result around 10-15 years ago an electrician was severely injured by an arc flash and spent several months in a burn unit when he closed in the breaker and it arced and failed. The solution that this plant has adopted last I knew rather than properly maintain their equipment is simply to wear 40 cal/cm2 suits while performing maintenance or even operating the breakers rather than take the downtime to maintain them properly.