A stairway, ladder, ramp or other safe means of egress must be located in trench excavations that are 4 feet (1.22 m) or more in depth so as to require no more than 25 feet (7.62 m) of lateral travel for employees. Designed to prevent slipping.
Pitching wedges have a loft of between 46 and 48 degrees. Approach wedges have lofts between 50 and 52 degrees. The extra loft on the approach wedge helps it to get up in the air, but decreases the distance hit.
It depends a lot on the loft of the pitching wedge. The A wedge is synonymous with the Gap wedge or GW. Ping uses the term UW for some of its A wedges. I always check the company website to be sure. An A wedge is usually a type of gap wedge, and it tends to fall in between the pitching club and the sand wedge. That means it could fall anywhere between 45 and 55 degrees. I have to add that I don't really use terms like sand wedge, lob wedge, gap wedge, or approach wedge anymore. I custom built my wedge set.