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How Not To

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Why we look inside electrical panels #3
The 15-amp breaker protecting the red wire should have tripped. The amount of current sufficient to melt the wire insulation would have normally caused the breaker to disconnect unless the heat was caused by a loose connection, forcing the current to jump across a gap (known as arcing). The breaker also may have malfunctioned.
Why we look inside electrical panels #1
Why we look inside electrical panels #2
Why we look inside electrical panels #3
Name this common electrical defect

 
   
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Inspecting Residential and Commercial Properties in the Bay Area and Western States since 1979