![]() It is very important to keep in mind that the "normal" contact status of a process-actuated switch refers to its status when the process is absent and/or inactive, not "normal" in the sense of process conditions as expected during routine operation. ![]() While this may be frowned upon by some, it leaves no room for interpretational error: in each case, the intent is clear and unmistakable: ![]() However, some people still use the older convention of connecting wires crossing with no dot, which may create confusion.įor this reason, I opt to use a hybrid convention, with connecting wires unambiguously connected by a dot, and non-connecting wires unambiguously "jumping" over one another with a half-circle mark. Newer electrical schematics show connecting wires joining with a dot, while non-connecting wires cross with no dot. Older electrical schematics showed connecting wires crossing, while non-connecting wires "jumped" over each other with little half-circle marks.
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