What does the term "wrench tight" refer to in conduit installations?

The term "wrench tight" in conduit installations specifically refers to a method of securing conduit fittings to ensure that they are properly fastened and do not loosen over time. This means that the fittings should be tightened sufficiently using a wrench, allowing them to create a reliable and secure connection that can withstand physical stresses and environmental factors.

When conduit fittings are installed, achieving a "wrench tight" status helps prevent the risk of disconnection, which could lead to electrical hazards or damage to the conduit system. This term emphasizes the need for proper installation practices to maintain safety and integrity in electrical systems.

In contrast, the other options do not pertain to the meaning of "wrench tight." The type of conduit used or size specifications for conduit bodies are different aspects of conduit installations that do not focus on the method of securing fittings. Similarly, electrical safety standards refer to guidelines and codes that govern the safe installation and maintenance of electrical systems but do not define specific installation practices like “wrench tight.”