Okay, this is a common, albeit sometimes unnecessary, request. Here's how I'd approach this as the EOR, anticipating the inspector's justification and preparing a response

Understanding the Inspector's Reasoning (and Potential Misinterpretations):

The inspector is likely thinking about: Grounding for Safety

Ensuring a fault to the sign's metal structure will provide a low-impedance path back to the source, tripping the overcurrent protection device (circuit breaker) and preventing a dangerous shock hazard. This is a fundamental principle of electrical safety.

Equipment Grounding Conductor (EGC) Termination

The inspector might be concerned about where the EGC from the sign's power circuit terminates. Simply connecting it to the metal sign structure may not be enough if the connection to the service/source is unreliable.

Induced Voltage (Less Likely but Possible)

In certain environments with nearby power lines or other sources of electromagnetic interference, there could be induced voltages on the sign structure. Grounding could help mitigate this.

Bonding vs. Grounding (Misconception)

Inspectors sometimes use "grounding" and "bonding" interchangeably, even though they're distinct concepts. Bonding focuses on creating a low-impedance path between metallic parts to equalize potential. Grounding connects to the earth.

Your Response Strategy (Once you get the code reference)


Acknowledge the Requirement and the Inspector's Concerns (Diplomatically)

"Thank you for raising your concern regarding grounding for the drive-thru signage. I understand the importance of ensuring a safe and properly grounded electrical system."2.

Analyze the Code Reference Provided



Identify the Specific Sections

Carefully review the specific sections of the code cited by the inspector. Common ones might include:

NEC Article 250 (Grounding and Bonding)

This is the big one. Pay close attention to sections dealing with grounding electrode systems, equipment grounding conductors, and supplemental grounding.

NEC Article 600 (Electric Signs and Outline Lighting)

This article might contain specific requirements for signs, but it's often more general.

Local Amendments

Check for any local amendments to the NEC that are in effect. These can be significantly different from the national code.3.

Determine if the Requirement is Actually Applicable



Does the Code Mandate a Grounding Electrode System for the Sign? This is the key question. Most likely, the answer will be NO. A dedicated grounding electrode (ground rod) is not typically required for a small sign that is fed from a properly grounded electrical panel. The Equipment Grounding Conductor (EGC) run with the power conductors is typically sufficient. Is a Supplemental Grounding Electrode Required? Sometimes the code suggests or allows a supplemental grounding electrode in addition to the EGC. This is often done for sensitive electronic equipment or in areas with poor soil conductivity.4. Prepare Your Stamped Letter (IF REQUIRED/NECESSARY) or Response



Scenario 1: Code Does Not Require Grounding Rods Letter Template (If they still insist on a letter)

[Your Company Letterhead][Date][Inspector's Name][Inspection Department][Address]

Subject: Drive-Thru Signage Grounding - [Project Name/Address]

Dear [Inspector's Name],Thank you for your inquiry regarding the grounding of the drive-thru signage for the above-referenced project. I have reviewed the applicable sections of the [Year] National Electrical Code (NEC), specifically [Cite specific relevant sections, e.g., Articles 250.118, 250.130] and [Cite local amendments, if any].Based on this review, a dedicated grounding electrode system (grounding rods) at each sign footing is not required for code compliance.  The sign's metal structure will be connected to the equipment grounding conductor (EGC) of the branch circuit powering the sign. This EGC will provide a low-impedance fault current path back to the source, ensuring proper operation of the overcurrent protective device (circuit breaker) in the event of a fault.[Optional: Briefly explain why you're not adding ground rods.  Example: "The electrical panel supplying the sign is already connected to a code-compliant grounding electrode system, and the addition of grounding rods at the sign footings would not provide any significant safety benefit in this particular application."]If you require any further clarification, please do not hesitate to contact me.Sincerely,[Your Name], PE[Your Title][Your Company][Your Contact Information][Seal/Stamp]

Important Considerations for This Letter



Be Firm but Professional

Don't be confrontational, but be clear in your explanation.

Cite Specific Code Sections

This is crucial. If the inspector still insists, ask them to specifically point to the code section that requires the ground rods.

Document Everything

Keep a copy of your letter and any communication with the inspector.

Scenario 2: Code DOES Require or Recommend Supplemental Grounding (Less Likely) Create a Sketch

Show the location of the ground rod (driven vertically into the earth, typically outside the footing).

Specify the Ground Rod Requirements

e.g., "5/8" diameter copper-clad steel, 8' long, driven to full depth."

Specify the Connection Method

e.g., "Exothermic weld (Cadweld) or listed grounding clamp to the sign's metal structure." Specify which part of the sign will be used for the connection

Specify the Conductor

e.g., "Minimum #6 AWG bare copper conductor from the ground rod to the sign."

Describe the Intended Purpose

"This supplemental grounding electrode is intended to provide additional protection against induced voltages and to enhance the performance of the equipment grounding system."

Letter Template (If supplemental grounding is required/recommended)

[Your Company Letterhead][Date][Inspector's Name][Inspection Department][Address]

Subject: Drive-Thru Signage Grounding - [Project Name/Address]

Dear [Inspector's Name],Thank you for your inquiry regarding the grounding of the drive-thru signage for the above-referenced project. I have reviewed the applicable sections of the [Year] National Electrical Code (NEC), specifically [Cite specific relevant sections, e.g., Articles 250.52, 250.53, 600.7].To address concerns related to potential induced voltages and to further enhance the performance of the equipment grounding system, the following supplemental grounding will be implemented at each sign location:   Grounding Electrode

 One (1) 5/8" diameter, 8' long copper-clad steel grounding rod, driven vertically into the earth outside of the concrete footing, per NEC 250.53.   

Connection

 The grounding rod will be connected to [Specify location on sign: e.g., the sign's internal metal frame] using [Specify connection method: e.g., an exothermic weld (Cadweld) or a listed grounding clamp suitable for direct burial].   

Conductor

 A minimum #6 AWG bare copper conductor will connect the grounding rod to the sign.[Attached is a sketch detailing the grounding rod installation method.]This supplemental grounding electrode is intended to provide additional protection against induced voltages and to enhance the performance of the equipment grounding system.If you require any further clarification, please do not hesitate to contact me.Sincerely,[Your Name], PE[Your Title][Your Company][Your Contact Information][Seal/Stamp]

Important Considerations for This Letter



Sketch is Essential

A clear sketch is a MUST.

Specify All Components and Methods

Leave no room for ambiguity.

Justify the Supplemental Grounding

Briefly explain why you're doing it (even if it's just to appease the inspector).5.

Ground Rod Installation Sketch

Your sketch should clearly show: The footing for the sign. The location of the ground rod (typically outside the footing). The dimensions (e.g., distance from the footing to the ground rod). The type and size of the ground rod. The method of connection (e.g., exothermic weld, grounding clamp). The conductor size and type. The point of connection to the sign structure.

Key Takeaways



Code is King

Always refer back to the NEC and any local amendments.

Documentation is Crucial

Keep a record of all communication.

Be Professional

Maintain a professional and respectful tone with the inspector.

Explain Your Reasoning

Don't just say "no." Explain why the code doesn't require ground rods or why the proposed solution is adequate.*

Know When to Compromise: Sometimes, it's easier to just add the ground rods than to fight a lengthy battle, especially if the cost is minimal. Consider the overall project timeline and budget.Good luck! Let me know the code reference the inspector provides, and I can refine this advice further. Flag for review