Okay, I've reviewed the files you attached. Here's a breakdown of my observations, concerns, and recommendations

General Impressions:
Comprehensive

You've done a good job gathering the necessary information and presenting a clear overview of the project. The diagrams and spec sheets are helpful.

Well-Organized

The documentation is relatively organized, which makes it easier to follow your train of thought.

Proactive

It's smart to plan this out and get feedback before submitting to the utility and/or building inspector.

Key Areas of Review and Concern


Service Capacity & Demand Calculations

This is the most critical area.

Mobile Home 1

Your demand calculation seems reasonable, accounting for general lighting, small appliances, and fixed appliances. However:

Heating/Cooling

You've included a 5kW load for heating. Is this electric resistance heat? Or a heat pump? If it's a heat pump, the demand factor might be different (and potentially lower). Also, ensure that the heating load accounts for the

LARGEST motor load (either Heating OR A/C) as per NEC 220.50 Range/Cooktop

Be sure you are using the correct demand factors from Table 220.55 in the NEC. The standard assumption is that a standard range can be derated. If they are non-standard, review the footnotes to Table 220.55

Electric Dryer

Included at 5kW. This sounds reasonable.

Water Heater

Included at 4.5kW. This sounds reasonable.

Mobile Home 2

Similar comments to Mobile Home 1. Double check the Heating / Cooling and Range values.

Detached Garage



Lighting/Receptacles

The calculation of 3000VA seems reasonable. However, make sure this considers the load for any specific equipment that would be stored in the garage, such as a battery charger, welder, etc. These could add significant load.

Motors

The inclusion of a 2HP motor (1.5kW) is good foresight.

Generator

I believe you are planning to run the detached garage off the generator only. Be sure to have a transfer switch and ensure the garage load on the generator is not significantly greater than the load it is designed for.

Combined Service Calculations

This is where the question of TWO services comes into play.

NYSEG Approval

You must get confirmation from NYSEG that they will allow two separate services. While the NEC might permit it under certain conditions, the utility has the final say.

NEC Compliance for Multiple Services (if approved)

Ensure you are adhering to NEC Article 230 regarding multiple services. This typically requires clear separation and identification of each service. 230.2(D) "Increased Capacity." A building can have an unlimited number of services when the building's load requires it. You still have to get NYSEG to buy into this concept.
2.

Generator Sizing



Load Calculation

You need a much more detailed load calculation for the generator. You have only calculated the minimums. You'll need to define the essential loads that the generator must support during an outage. This likely includes: Lighting in essential areas (living room, kitchen, bathrooms, hallways) Refrigerator Heating system (at least a portion of it, especially if it uses electricity for controls or forced air) Sump pump (if applicable) Well pump (if applicable) Critical medical equipment (if applicable) Some receptacle outlets for charging phones and other small devices Garage (if applicable)

Generator Capacity

Once you have a realistic load calculation, add a safety margin (typically 20-25%) to determine the required generator capacity.

Fuel Type

Consider the fuel type (propane vs. natural gas vs. gasoline) based on availability, cost, and storage considerations.

Automatic Transfer Switch

Absolutely essential for a standby generator system. This ensures safe and automatic switching between utility power and generator power.

Local Codes

Check with your local building department regarding any specific generator installation requirements (e.g., setback distances, noise restrictions, permitting).3.

Wiring Methods and Grounding



Underground Service

Confirm the correct burial depth for your service conductors with both NYSEG and the NEC (typically depends on voltage and conduit type).

Grounding Electrode System

Ensure you have a proper grounding electrode system (ground rods, water pipe electrode, etc.) that complies with NEC Article 250. A single ground rod may not be sufficient; supplemental electrodes are often required.

Separation of Neutral and Ground

Absolutely critical. Neutral and ground must be bonded only at the service entrance. In subpanels (in the mobile homes and garage), the neutral and ground must be kept separate.4.

Manufactured/Mobile Home Specifics



NEC Article 550

Pay close attention to NEC Article 550, which covers the specific requirements for electrical installations in manufactured homes.

Feeder Calculations

Double-check your feeder calculations to ensure that the conductors are adequately sized for the calculated demand load, including voltage drop considerations.

Disconnecting Means

Each mobile home must have a readily accessible disconnecting means located within or immediately adjacent to the unit.5.

NYSEG Service Requirements



Spec Book Adherence

You're on the right track by following the NYSEG spec book. However, confirm all requirements directly with NYSEG before proceeding. They may have specific requirements for metering, service entrance equipment, grounding, and other aspects of the installation.

Point of Connection

Clarify the exact location of the point of connection with NYSEG. This will affect your service lateral design.

Metering

Confirm the metering requirements with NYSEG. Will they provide meters for each service, or will you need to provide a meter enclosure?

Specific Recommendations



Contact NYSEG Immediately

Discuss your project with a NYSEG engineer or service representative. Get their approval for the two-service approach and clarify all their specific requirements. This is the most important step.



Refine Load Calculations

Develop more detailed load calculations for the generator and for each mobile home, paying close attention to the specific appliances and equipment that will be installed. Include safety margins.

Consult with a Licensed Electrician

I strongly recommend consulting with a licensed electrician who is familiar with the NEC and NYSEG requirements. They can review your plans, perform the necessary calculations, and ensure that the installation is safe and code-compliant. A licensed electrician is also required to pull the permit and sign off on the project in most jurisdictions.

Review NEC Articles

Familiarize yourself with the relevant articles of the NEC, particularly Articles 220 (Load Calculations), 230 (Services), 250 (Grounding and Bonding), 550 (Manufactured Homes), and 702 (Optional Standby Systems).

In Summary

Your project plan shows good initiative. The key is to get official approval from NYSEG for your two-service approach and to refine your load calculations for the generator and mobile homes. Working with a licensed electrician is highly recommended to ensure code compliance and safety. Good luck!

Disclaimer: This review is for informational purposes only and should not be considered a substitute for the guidance of a qualified electrician or engineer. Flag for review