Section 392.60(A)
Grounding and Bonding
(A) Metallic Cable Trays
. Metallic cable trays shall be
permitted to be used as equipment grounding conductors
where continuous maintenance and supervision ensure
that qualified persons service the installed cable tray
system and the cable tray complies with provisions of this section. Metallic cable trays
that support electrical conductors shall be grounded as required for conductor enclosures
in accordance with 250.96 and Part IV of Article 250. Metal cable tray containing only
non-power conductors shall be electrically continuous, through approved connections or
the use of a bonding jumper not smaller than a 10 AWG.
Informational Note: Examples of non-power conductors include nonconductive optical fiber
cables and Class 2 and Class 3 Remote Control Signaling and Power Limited Circuits.
Analysis of Change:
Section 392.60 (392.7(A), 2011 NEC was revised to require the metal cable tray systems
to be bonded when used with non-power conductors.
250.96 (A) Bonding other Enclosures.
Metal raceways ,Cable trays, Cable Armor, Cable sheath ,Enclosers, Frames, Fittings and other metal non-current carrying parts that serve as Equipment grounding conductors with or without the use of Supplementary grounding conductors Shall be bonded where necessary .
Yoopersup
The (Tray or RMC) or anything approved by 250.118 by itself
that can carry the fault current well do the trick.
So is anything else Supplementay.
