It is not necessary to install bonding jumpers in parallel with the standard rigid aluminum or steel one-piece metallic bolted side rail splice plates that are the connections between the cable tray sections. Here, the use of bonding jumpers does not make a safety contribution to a properly. Standard splice plates can often provide a safe electrical path if they are UL Classified and bolted tight.
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When installing a fiber jumper, excessive force may exert pressure on it and the connectors on both ends, thus affecting its performance. Consult the cable specification sheet for the cable you are installing Do not bend the cable more sharply than the minimum recomme ded bend radius. Fiber doesn't wear out or degrade (to any reasonable extent in any reasonable timeframe, outside of poor outdoor splices or extreme environments) or oxidize, is digital not analog, so they either work or don't (the later being broken due to abuse or extreme environments).
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Whether you need extra wires (jumpers) depends on if your connecting plates are tested for grounding. If the plates are UL Classified, they are strong enough to carry electricity safely by themselves. They are required to be used on locations where the tray is not continuously grounded or when splice plates that aren't UL listed are used. Cable trays are holding SOOW cords from a control trailer with starters to crusher motors but are not continuous and are in sections away from each other. Cable tray may be used as the Equipment Grounding Conductor (EGC) in any installation where qualified persons will service the installed cable tray system.
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Care must be taken to insure that the wire is securely fixed in the terminal block if it shares space with a jumper "comb". Both the SAK style and W-Series style jumpers use captive screws with locking washers to insure a positive connection to the current bar. DIN rail mounted terminal blocks are found in nearly every industrial control panel.
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