Final answer:
Explosion-proof raceway is the most commonly used type of raceway in hazardous locations, designed to contain and prevent explosions from spreading outside the raceway.
Step-by-step explanation:
The type of raceway that is mostly used in hazardous locations is explosion-proof raceway.
Explosion-proof raceway is designed to contain and prevent explosions from spreading outside the raceway. It is commonly used in areas where there is a risk of flammable gases, vapors, or dust.
Other types of raceways that may be used in hazardous locations include intrinsically safe raceway and watertight raceway, depending on the specific requirements and conditions of the location.