Okay, let's break down your situation and address the concerns. You're trying to provide a surge protection solution for your customer, and the lengthy warranty offered with an SPFD (Surge Protective Device, Flush-Mounted) is a significant selling point. However, the recessed panel presents installation challenges, and you're considering an alternative: mounting the SPFD inside the panel.Here's a structured approach to your problem

1. Safety and Code Compliance (Priority #1):
NEC is King

The National Electrical Code (NEC) always takes precedence. No convenience or warranty is worth violating the code.

Manufacturer's Instructions

The

absolute first step is to consult the installation instructions for the Siemens Boltshield 100kA SPFD. The instructions MUST permit internal mounting within the panel, and also provide instructions on how to do so safely. If the instructions don't explicitly say it's okay and show how, do not do it. Siemens (or Eaton, Square D, etc) knows best how their devices are intended to be used, it's the safest option if their documentation explicitly covers the setup your thinking of doing. UL Listing

Look for the UL marking on the SPFD. It signifies the device has been tested and certified by Underwriters Laboratories for safety and performance. UL listing for the

specific mounting configuration you're planning is crucial. Just because the device is UL listed doesn't mean all mounting options are. Clearances

Internal mounting must adhere to NEC requirements for clearances within the panel. Overcrowding can lead to overheating and safety hazards.

2. The Internal Mounting Question



Siemens FS100 as a Reference

The fact that Siemens shows an internal device (FS100) is encouraging, but it doesn't automatically mean the Boltshield 100kA can be mounted internally in the same way. The FS100 may be specifically designed and tested for internal mounting, with different internal components or heat dissipation characteristics.

Potential Issues with Internal Mounting



Heat Dissipation

Surge protectors generate heat when diverting surges. Confining that heat within the panel can be problematic, potentially damaging other components.

Accessibility

Internal mounting can make it difficult to inspect the SPFD's status LEDs.

Warranty Implications

Mounting the SPFD in a manner not explicitly permitted by the manufacturer could void the warranty – exactly the opposite of what you're trying to achieve.

Wire Bending Space

Ensure you have adequate wire bending space inside the panel for proper and safe connections.

3. Addressing the Recessed Panel Challenge



Alternative Mounting Options



Spacers/Extenders

Instead of relying on questionable Amazon mounts, consider using high-quality spacers or extenders to bring the SPFD flush with the drywall surface. You'll need to find appropriately sized and rated spacers. Secure them firmly to the studs or panel backing.

NEMA Enclosure

Mount the SPFD in a small, surface-mounted NEMA enclosure adjacent to the panel. This keeps it protected and accessible.

Surface-Mounted SPDs

While you're focused on SPFDs, explore the possibility of a high-quality, surface-mounted SPD. Some models offer excellent surge protection and decent warranties, even if they don't match the SPFD's terms. These are designed to be mounted on the wall next to the panel.

Amazon Mounts

While you're hesitant, if you find a mount on Amazon (or elsewhere) that explicitly states it's UL listed for electrical equipment and is the proper size for your device, that might be okay. Carefully check the reviews and specifications. Don't buy anything that looks flimsy or questionable.

4. Communicating with the Customer



Honest Assessment

Explain the pros and cons of each approach to the customer. Be upfront about the challenges of the recessed panel and the potential risks of non-standard mounting.

Prioritize Safety and Code

Emphasize that your primary concern is to provide a safe and code-compliant installation. The warranty is secondary to that.

Present Options

Give the customer a clear choice between the available solutions, including the cost implications of each. For example: "We can use the flush-mounted SPFD with spacers, but this will add [X] to the cost." "We can use a surface-mounted SPD, which has a slightly less comprehensive warranty, but it's easier to install and fully compliant."

Get Agreement in Writing

Document the chosen solution and have the customer sign off on it. This protects you in case of future issues.

5. Warranty Research



Read the Fine Print

Thoroughly review the warranty documents for any SPD you recommend. Understand the limitations, exclusions, and claims process. Often, the "up to $75,000" is subject to very specific conditions and may not cover all types of damage.

QSPD Warranties

Keep an eye on QSPD (Quick Surge Protective Device) warranties. They may improve over time as competition increases. Contact manufacturers directly to inquire about warranty terms and potential upgrades. Sometimes, the best QSPD with a limited warranty is better than a mediocre SPFD with a great warranty.

In summary



DO NOT mount the SPFD inside the panel UNLESS the manufacturer's installation instructions explicitly allow it and provide specific guidance. Prioritize code compliance and safety over the warranty. Communicate openly with your customer and get their informed consent. Explore alternative mounting options for the SPFD or consider a high-quality surface-mounted SPD. Thoroughly research and understand the warranty terms.It's better to spend more time planning and ensuring a safe and compliant installation than to risk electrical hazards or a voided warranty down the road. Flag for review