Welcome to the group! You're right to question and dig into the code. That's how we all learn and stay sharp.Let's break down the situation and the relevant code sections.

Here's my understanding

You're relocating an airport rotating beacon. The beacon has serviceable parts (lamps, rotating mechanism, etc.). The power source is several hundred feet away and not visible from the beacon. Your boss doesn't think a disconnect is needed at the beacon base. You do think a disconnect is needed at the beacon base, citing 225.31(B).

Analysis of 225.31(B) and Related Sections



225.31 Disconnecting Means. This section is about providing a way to disconnect power to outdoor equipment. 225.31(B) Location. This is the crux of your argument. It states:> The disconnecting means shall be installed either inside or outside of a building or structure at a readily accessible location nearest the point of supply.

Readily Accessible. It's important to clarify what "readily accessible" means. The NEC defines it as:> Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth.Your Argument

You're interpreting 225.31(B) to mean the disconnect must be near the beacon because:1. The beacon is an outdoor structure.
2. The beacon has serviceable parts, so maintenance will be required.3. The power source is not visible from the beacon, making it unsafe to work on the beacon without a local disconnect.

Arguments Against a Disconnect at the Beacon

Your boss might argue:1. The disconnect is located at the building with the power source, and that is the "point of supply" and meets 225.31(B).
2. The beacon is not located on or inside a building or structure.3. The beacon is a single load and thus, doesn't require an external disconnect.
4. Maintenance can simply call someone to disconnect the circuit breaker in the building.

Counterarguments and Code Interpretation

Here's why I believe your interpretation has merit:

Safety is paramount

The whole point of a disconnect is safety during maintenance. If the power source is out of sight and hundreds of feet away, relying on someone else to kill the breaker introduces a significant safety risk. Imagine someone making a mistake, misunderstanding instructions, or forgetting to lock out/tag out the breaker.

Readily Accessible

Having to walk several hundred feet to a different building to disconnect power doesn't really feel "readily accessible" in the context of maintenance on the beacon itself. Especially in inclement weather.

The intent of the code

The NEC is primarily concerned with safety. While your boss might be technically correct in arguing that the disconnect at the power source meets the letter of the code, it doesn't necessarily meet the spirit of the code, which is to provide a safe working environment.

Related Sections to Consider



Article 100 - Definitions

Refresh your understanding of "readily accessible," "disconnecting means," and "structure."

225.39 Rating of Disconnecting Means This section will apply to the disconnect that you choose to install. 70.5 Scope The NEC covers installation of electrical equipment. 70.1 Purpose To safeguard persons and property from hazards. 90.4 Enforcement It is the AHJ's responsibility to enforce this Code.

Recommendations


Talk to the AHJ (Authority Having Jurisdiction)

This is the most important step. The local electrical inspector has the final say. Present your argument, show them the code sections, and explain the safety concerns. Get their opinion in writing if possible. "The inspector said so" is a powerful argument with your boss.2.

Document Everything

Keep a record of your conversation with your boss, your research, and your communication with the AHJ. This protects you if something goes wrong later.3.

Compromise (Maybe)

If the AHJ doesn't require a disconnect at the beacon, could you add a prominently labeled and lockable "Emergency Shut-Off" switch at the beacon that shunts the power but doesn't completely disconnect it? This would provide a quick way to de-energize the beacon in an emergency.4.

Consider adding a local generator This would power the rotating beacon and obstruction lighting making the disconnect at the remote panel unnecessary.

In conclusion, while your boss's argument might have some technical merit, I believe your interpretation, prioritizing safety and accessibility for maintenance, is more reasonable. The AHJ's decision is what matters in the end.Let me know if you have any other questions! Good luck dealing with your boss! Flag for review