DIY

Knob and tube wiring was engineered for air cooling and no grounding conductor, so its risks come from later modifications rather than from the method itself.

Neutral bar terminations generally take one grounded conductor per hole, and doubling them creates a loose connection that heats where nobody ever looks.

AFCI versus GFCI is not a quality comparison: one detects arcing that starts fires, the other detects leakage current that causes shock, and many places need both.

Breaker panel compatibility is established by listing and by the label inside the panel door, not by whether a breaker physically clips onto the bus stab.

A double-tapped breaker puts two conductors in a terminal listed for one, which leaves at least one of them loosely clamped and prone to overheating.

Every listed termination has a terminal torque specification, and both undertightening and overtightening produce connections that heat and eventually fail.

A main breaker versus main lug panel choice is about where the disconnecting means lives, and a main lug panel depends on protection somewhere upstream.

Service entrance conductors run from the utility to the main disconnect without overcurrent protection at their supply end, which changes how they must be treated.

Metal water pipe bonding keeps plumbing from becoming energised, which is a different purpose from using a buried water pipe as a grounding electrode.

Ground rod resistance depends mostly on soil and moisture, and the rule about supplemental electrodes exists because testing every rod is impractical.