Cable tray bonding

[mooreaaryan]

Do I have to use a bonding jumper at each cable tray splice point that is bolted tightly together? I currently have 3 runs of 24 tray about 80ft long. we have one expansion plate section per run in which I plan on using a bonding jumper at, I am curious about all other points

 

[bwat]

You aren't even required to always use a bonding jumper if the tray is being used as EGC. Can be bolted mechanical connectors.

My underline.

392.60(B) Steel or Aluminum Cable Tray Systems. Steel or aluminum
cable tray systems shall be permitted to be used as equipment
grounding conductors, provided all the following
requirements are met:
(1) The cable tray sections and fittings are identified as an
equipment grounding conductor.
(2) The minimum cross-sectional area of cable trays conform
to the requirements in Table 392.60(A).
(3) All cable tray sections and fittings are legibly and durably
marked to show the cross-sectional area of metal in channel
cable trays, or cable trays of one-piece construction,
and the total cross-sectional area of both side rails for
ladder or trough cable trays.
(4) Cable tray sections, fittings, and connected raceways are
bonded in accordance with 250.96, using bolted mechanical
connectors or bonding jumpers sized and installed in
accordance with 250.102.

Since it is referenced also:

250.96 Bonding Other Enclosures. (A) General. Metal raceways, cable trays, cable armor, cable
sheath, enclosures, frames, fittings, and other metal non–
current-carrying parts that are to serve as equipment grounding
conductors, with or without the use of supplementary
equipment grounding conductors, shall be bonded where
necessary to ensure electrical continuity and the capacity to
conduct safely any fault current likely to be imposed on them.
Any nonconductive paint, enamel, or similar coating shall be
removed at threads, contact points, and contact surfaces or
shall be connected by means of fittings designed so as to make
such removal unnecessary.