You're on the right track. Here's a breakdown of why your plan should work and some key considerations

Why it Should Work (The Logic):
200A Service Compatibility

A 200A Generac automatic transfer switch (ATS) is designed to handle a 200A service. You're upgrading the transfer switch's capacity to match the service amperage, which is good.

14kW Generator Size

A 14kW generator is well within the capacity of a 200A ATS. The ATS will simply switch between the utility feed and the generator feed based on power availability.

Outdoor Location

Placing the ATS outdoors, below the meter base, is a common and code-compliant practice as long as you use an outdoor-rated ATS.

Automatic Transfer

The Generac ATS will automatically switch power sources, providing seamless backup power during outages, which is what your customer likely wants.

Important Considerations and Steps


Model Selection



Generac 200A ATS Model

You need to identify the specific Generac 200A ATS model you plan to use. Make sure it's compatible with your generator and has the features you need (e.g., load shedding capabilities).

Generator Compatibility

Confirm the ATS is designed to work specifically with Generac generators. Different generators might have different control wiring requirements.

Sizing

Verify that the 14kW generator has enough capacity to support all the circuits that will be transferred to generator power. While the ATS is rated for 200A, the generator's output limits how much load can be supplied.

Consider Load Management

If the generator is close to its maximum output with the intended load, explore load shedding features in the ATS. Load shedding allows you to prioritize essential circuits during generator operation and prevent overloading.2.

Wiring and Connections



Utility Feed

The utility feed will connect to the line side of the ATS.

Load Side

The load side of the ATS will connect to your house panel(s) feeding all of your loads.

Generator Connection

Connect the generator output to the appropriate terminals within the ATS. Pay close attention to voltage, phase, and neutral bonding.

Control Wiring

Connect the control wires between the generator and the ATS. This wiring tells the ATS when the generator is running and ready to supply power. (This is where the generac compatibility comes in)

Grounding

Properly ground the ATS according to code. This is critical for safety.

Neutral Bonding

Neutral bonding is a crucial aspect. Generally, the neutral should be bonded at only one point in the system. Typically, this is at the main service panel. The ATS might have a neutral bonding jumper that needs to be enabled or disabled depending on your specific setup.
Consult the ATS installation manual and local electrical codes to ensure proper neutral bonding. Improper neutral bonding can create circulating currents and safety hazards.3. Code Compliance



Local Codes and Permits

This is not optional. You must obtain the necessary permits and comply with all local electrical codes. The inspector will verify your wiring, grounding, and bonding.

NEC (National Electrical Code)

Ensure your installation adheres to the NEC. Pay close attention to sections related to generator installations, transfer switches, and grounding.

Sizing Conductors

Use appropriately sized conductors for all connections based on the amperage and distance.4.

Installation Procedure



De-energize Everything

Before starting any work, completely de-energize the service.

Mounting

Securely mount the ATS according to the manufacturer's instructions.

Wiring

Carefully wire the ATS, paying attention to the proper terminals and torque specifications.

Testing

After installation, thoroughly test the ATS to ensure it switches properly and the generator supplies power to the intended circuits.5.

Documentation



ATS Manual

Keep the ATS installation and operating manual readily available for future reference.

Wiring Diagram

Create a clear wiring diagram of the entire system, including the ATS, generator, and main panel.

Why Generac Support Might Not Have Been Helpful (and Why You Still Need to Follow Their Documentation)

Generac customer service representatives often can't give specific installation advice because:

Liability

They can't be held liable for improper installations.

Code Variations

Local codes vary, and they can't know the specifics of your area.

Complexity

Each installation is unique.However, always refer to the specific installation manual for the Generac ATS model you are using. This manual will provide detailed wiring diagrams, configuration instructions, and troubleshooting tips.

In summary, your plan to install a 200A Generac ATS below the relocated meter base should work if you

Select the correct ATS model that is compatible with your generac generator. Follow all wiring and grounding requirements. Comply with local electrical codes. Thoroughly test the system.

Recommendation: If you are not entirely comfortable with any aspect of this project, consult with a licensed electrician experienced in generator and ATS installations. A mistake can be very dangerous or very expensive. It's worth the investment to ensure a safe and reliable installation. Flag for review