romex jockey
Senior Member
- Location
- Vermont
- Occupation
- electrician
Are those MC connectors used on NMS?
Not that it makes a difference......
This one of many reasons you need to put cover plates, ko seals, 1/8 min. gap around outlet boxes and 1/4 inch max set back on boxes.......... and I know that many of us can add to this and cite code.
I am sure there are a lot more violations but the OP has not posted for us to call out violations of NEC.
He is showing the dangers of loose connections which is a habit of a unqualified person.
You are missing my point. No matter how good we are at our jobs, connections do come loose. And if your boxes ....ect are sealed properly it would reduce the spread of fire.
277 volt lighting circuit. still on. and the lights working.
No box installed on I beam. there was no signs of water damageThat looks like the box got wet and caused the failure
I have not seen anything that would lead me to believe that an AFCI, even of the combination type, will detect and clear a high resistance connection. There are two issues. First is it an arcing connection. A high resistance connection can produce enough heat to cause a lot of damage without being an arcing connection. Second you can produce a lot of heat in a small area with currents less than 5 amps. Even if it is a series arc, the AFCI does not look at the arc signature unless the current exceeds 5 amps.Why is the AFCI not tripping maybe the version he is using does not detect a series fault. Seems odd to me.
If the connection is done correctly, it shouldn't fail unless it is due to another factor (ie. loose connection, incorrect material, by unqualified person, foreign object (dust, water, fumes...) or any other thing...) Otherwise a good connection should not fail.
No box installed on I beam. there was no signs of water damage
Sierraspark, Here is the same box on the 2nd floor of 9 story building no plumbing in this area. Don't know why the interior of box is rusted.Ok so that brown colored stuff in the box they call rust just got there by majic. Then there is the oxidation on the outside of the box. Majic again!
This box was subject to some moisture and may have degraded the splice.
I am sitting at my desk so I cannot be sure.