What do proofing mandrels and swabs check for in a raceway system?

Proofing mandrels and swabs are essential tools used in the inspection of raceway systems to ensure they are clear of any obstructions that could impede the installation or functioning of cables and wires. When inserted into the raceway, these tools allow technicians to verify that the pathway is free from blockages, such as debris, water, or even previous installations that may not have been properly removed. Ensuring that the raceway is unobstructed is critical for maintaining the efficiency and safety of the electrical system.

The other choices do not accurately reflect the primary function of proofing mandrels and swabs. For example, temperature variations are typically assessed using thermographic cameras or temperature sensors, while checking for electrical flow involves using multimeters or continuity testers. Signal loss usually pertains to communication systems and is evaluated through specific signal integrity tools rather than the physical inspection of raceways. Therefore, the primary role of proofing mandrels and swabs is to ensure there are no obstructions that could affect the installation and performance of electrical systems within raceways.