Tray continuous ground conductor
Tray continuous ground conductor
(OP)
Our contractor installed a multiconductor cable in a tray. I was told per NEC, we have to increase size of existing bare tray grounding cable because it's smaller than our newly installed cable equipment ground. Is that correct? Each cable in this tray has its own equipment ground.






RE: Tray continuous ground conductor
RE: Tray continuous ground conductor
RE: Tray continuous ground conductor
250.86 Other Conductor Enclosures and Raceways means that any cable tray has to be connected to the equipment grounding conductor -excepting [see the 4 required exceptions for pos.1 exceptions and 2 or 3- if any ].
In this case only part of the ground fault current will flow through the cable tray. If you can appreciate how much will be this part you may verify if the cable tray will withstand this.
From our experience in power stations-we prefer to comply the code like all the current will flow through cable tray only.
RE: Tray continuous ground conductor