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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: electrical deaths
Date: Mon, 2 Dec 2024 19:41:13 -0700
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On 12/2/2024 2:44 PM, Carlos E.R. wrote:
> The electrician was baffled. He found out that the station switched the 
> transformer one notch at that hour, but why would that cause the GFCI to 
> trigger nobody could imagine. Finally he found the crossover, and the thing 
> stopped happening.

GFCIs are touchy.  When someone complains of a failing GFCI, I immediately
tell them to recheck ALL of the connections as this tends to cause
"false" trips.

> On that same place, a cable entered a certain tube with one colour and exited a 
> different colour.
> 
> Turned out that the installation had been done by three different electricians, 
> each not knowing what the previous one intended or did.

Here, any "splice" has to be done in a junction box.  And, all junction
boxes must be accessible.  So, the wire entering a conduit at one end
WILL be the wire exiting at the other.