weressl
Esteemed Member
One comment about OTJ. There are NO controls. One does not know if one learns the right stuff or a shortcut that may produce appearent good result but may have some serious shortcomings. I see this a lot with maintenance work, but new installations also.
Let me give you an example. This is an industrial issue, but you may inderstand the equivalent if you think of a panelboard in a dwelling unit.
Multiple tray cables entering into the same vertical section of an MCC are routinely passed through a single 3" knockout. The cables are not secured at the point of entrance by a box connector and since there are multiple cables entering through one hole that is not designed for the purpose the voids between the cables compromise the NEMA rating of the enclosure.
Let me give you an example. This is an industrial issue, but you may inderstand the equivalent if you think of a panelboard in a dwelling unit.
Multiple tray cables entering into the same vertical section of an MCC are routinely passed through a single 3" knockout. The cables are not secured at the point of entrance by a box connector and since there are multiple cables entering through one hole that is not designed for the purpose the voids between the cables compromise the NEMA rating of the enclosure.