You've presented a good, logical breakdown of the code. Here's my analysis and conclusion, which aligns with yours

Analysis
90.3 (Code Arrangement)

You're correct. Article 800 (Communications Circuits) generally stands alone except where Article 800 specifically references other articles. This is the crucial point.

800.110(A)(1) (Raceways)

You're spot on. 800.110(A)(1) requires raceways to be installed per their respective articles. However, cable trays are NOT raceways as defined in Article 100. This is a critical distinction. 800.110(A)(1) is not applicable to cable tray

392.60 (Grounding and Bonding)

You're right to point out 392.60. It discusses non-power-limited cable trays. The informational note is also pertinent because it clarifies the intent of the code with respect to Class 2 and 3 cables. It implies that 392 is primarily concerned with the safe installation of power-carrying conductors, or non-power carrying when installed with power.

800.110(D) (Cable Trays)

This section permits the use of cable trays for communication cables, which is good. But it does not mandate bonding.

Article 250

While 250 is the grounding and bonding article, because the cable tray containing only communications conductors doesn't need to be installed using 392, the requirements of 250 don't need to be applied unless directly called out in article 800.

Conclusion

Based on the 2020 NEC (and the principles generally remain in the 2023 NEC), you are correct: A cable tray used exclusively for communication cables (Article 800) does not explicitly require bonding by the NEC.Enforceability Difficult to Enforce Based Solely on the NEC

You're right. An inspector attempting to enforce bonding on a communications-only cable tray installation would have a very weak case, relying on broad interpretations rather than specific code language.

Important Considerations and Caveats Manufacturer's Instructions

Always check the manufacturer's instructions for the cable tray. They might have specific recommendations or requirements for grounding/bonding.

Local Amendments

Be aware that local jurisdictions may have amendments to the NEC that do require bonding in these situations. Always check local codes.

Best Practices/Engineering Judgment

While not strictly required by the NEC, there may be very good engineering reasons to bond a cable tray even when used only for communication cables:

EMI/RFI Mitigation

Bonding can provide a path for unwanted electromagnetic interference (EMI) or radio frequency interference (RFI) to ground, potentially improving signal quality.

Static Discharge

Bonding can help prevent the buildup and discharge of static electricity, which could damage sensitive communication equipment.

Future Use

If there's any possibility that power conductors might be added to the cable tray in the future, bonding it from the outset is a prudent decision.

Customer Requirements

The end-user or building owner might have their own requirements for bonding, regardless of the NEC.

Recommendations1. Thoroughly Review Local Codes

This is the most important step.2.

Consult with the Customer/Engineer

Discuss the potential benefits of bonding (EMI mitigation, static discharge, future expansion) and whether they have specific requirements.3.

Document Your Decision

If you decide not to bond, document your reasoning, including the relevant code sections and the absence of local amendments. This protects you in case of future questions or disputes.

In summary, while the NEC doesn't mandate bonding for communications-only cable trays, it's important to consider all factors before making a final decision. Flag for review