Should a properly fitted balaclava be tight against the head to increase the arc rating?

A properly fitted balaclava should not be tight against the head to increase the arc rating because arc-rated protective apparel is designed to provide a specific level of protection based on how it fits and the materials used. The effectiveness of an arc-rated balaclava relies on a combination of factors, including the fabric's ability to resist heat and electrical arcs, as well as maintaining a proper air space that can help in dissipating heat away from the body.

If the balaclava is too tight, it could compress the insulating properties of the fabric, potentially reducing its protective capabilities and increasing the risk of injury in case of an electrical arc. Additionally, a snug fit may hinder mobility and comfort, which can lead to distraction or reduced effectiveness in hazardous situations.

The other options may imply scenarios where fitting might vary based on additional factors, but the fundamental principle is that the proper protective function of the balaclava is achieved with a fitting that allows for adequate insulation without being overly tight against the skin.