Electrical safety-related work practices are governed by different OSHA regulations for utilities and construction companies. Utilities follow 29 CFR 1910.269 and construction companies follow either 1926 Subpart K or 1926 Subpart V, depending on the job site. It wasn’t until the 1910.269 revisions in 2014 that OSHA used direct wording mandating arc-rated clothing. And while it may seem that five years is enough time to install an organization-wide PPE program, it is not uncommon to find such programs lacking. Recently, a utility’s operational team confirmed that they normally operate a piece of equipment while wearing street clothing. While this practice may not be a problem in certain limited cases, in this instance the garment labels prohibited any energized work based on the high arc flash energy. The problem was, these workers failed to realize that switching off is considered energized work. Serving as independent safety consultants to various construction companies and utilities has offered us a great deal of insight into similar hazardous operating conditions, but at the same time has allowed for testing and implementing what works in these environments. This article, the first in a two-part series, introduces the concepts of arc flash and shock hazards, followed by a discussion about personal protective equipment (PPE) that guards against those hazards. The second article in this series will provide guidance on how to effectively communicate the adequate level of protection to workers.