You are correct. A ground rod at each pole is generally not required and can potentially be detrimental. Here's why: Redundant and Potentially Conflicting Ground Paths

The Equipment Grounding Conductor (EGC) provides a low-impedance fault current path back to the source, which is essential for quickly tripping the circuit breaker or blowing the fuse in the event of a fault. Adding ground rods creates a parallel ground path. If the impedance of the ground rod path is significantly different from the EGC path, it can cause circulating currents and potentially delay the clearing of a fault.

EGC is Required by Code

The NEC (National Electrical Code) mandates an EGC be installed with the circuit conductors. This is the primary means of grounding.

Ground Rods are NOT a Replacement for the EGC

Ground rods are intended to dissipate voltage from events like lightning strikes and should not be used as a primary means of clearing faults. They have a high impedance and are slow to clear a fault, leaving the energized equipment hazardous for too long.

Potential for Increased Touch Voltage

If a fault occurs, the ground rod can become energized, potentially creating a shock hazard if someone touches the pole and the surrounding earth simultaneously.

Exceptions and Clarifications Isolated Ground (IG) Receptacles (Unlikely)

If the floodlights require isolated ground receptacles, the situation is more complex. However, even in this case, a separate ground rod is not usually required. Consult with a qualified electrical engineer.

Lightning Protection (Separate System)

If the floodlights are part of a lightning protection system (which is a separate and distinct system from electrical grounding), then ground rods would be required for the lightning protection system, and they should be bonded to the EGC at a single point.*

Local Code Requirements

In very rare cases, local jurisdictions may have specific requirements for ground rods at outdoor lighting fixtures. This is unusual, but it's always wise to check your local code.

Recommendation


Verify the EGC

Ensure that the EGC is properly sized and connected to the pole and floodlights, all the way back to the panel board. The EGC is your primary fault current path.2.

Check Local Codes

Double-check your local electrical codes to be absolutely certain there are no specific requirements for supplemental grounding at lighting poles.3.

Document Your Reasoning

Document your decision and the reasoning behind it, referencing the NEC and any other relevant information. This will be helpful if you are questioned by inspectors or others.

In summary, you are correct in stating that ground rods are likely not necessary for your flood light poles, provided you have a properly installed EGC. Focus on ensuring the EGC is correctly sized, installed, and terminated at all points in the circuit. Flag for review