Okay, let's break down your temporary 3-phase generator connection and address your questions systematically. This is important to do correctly and safely.

Cable Considerations: Power and Control

Your goal is to find a single cable to handle both power and control. This is definitely doable, though finding an "off-the-shelf" solution might be challenging. Here's a breakdown of your options:1. Custom Cable Assemblies

This is likely the best approach. You can specify a cable with the exact conductor count and wire gauge you need. A cable manufacturer or distributor who does custom assemblies can create a solution combining power and control wires within a single jacket.

Benefits

Tailored to your needs, cleaner install, professional look.

Drawbacks

Higher cost than off-the-shelf, longer lead time.

Where to look

Contact cable manufacturers like Southwire, General Cable (Prysmian), or smaller specialty cable manufacturers. Search online for "custom cable assembly" or "generator cable assembly". They will need to know the wire gauge you require and insulation ratings.2.

Your Proposed 6/5 Type W + 14/2 SO/SJ

This is a viable alternative if you can't source a custom cable. Here are some points to consider:

6/5 Type W

Suitable for the power conductors. Make sure it's rated for outdoor use and is flexible enough for your trailer-mounted setup.

14/2 SO/SJ

Works for the control wires. Keep this physically separated and well-supported from the power cable to prevent damage or interference.

Bonding

Make sure both cables are properly bonded at both ends for safety and to minimize potential ground loops.3.

Type G Cable

Type G cable is primarily used for power and for very robust/heavy-duty applications. It is not commonly used for data or control applications because the minimum size of control cables are 16AWG and typically require shielded cables.

Advantage

Robust.

Disadvantage

Generally much less flexible than Type W, not designed for control signals.

Important Considerations for All Cable Options



Voltage Rating

Ensure the cable is rated for the voltage of your generator (e.g., 208V, 480V).

Temperature Rating

Choose a cable with a suitable temperature rating for your environment.

Flexibility

For a trailer-mounted generator, flexibility is critical to prevent cable damage from movement.

Neutral as a Current-Carrying Conductor (CCC) Yes, the neutral likely will be a CCC. In a 3-phase system, the neutral carries current when there are unbalanced loads across the phases. The more unbalanced the loads, the more current flows in the neutral. Sizing the Neutral

NEC Article 220.61 provides guidance on sizing the neutral conductor for 3-phase systems. Generally, you'll need to calculate the maximum unbalanced load and size the neutral accordingly. You can't simply assume a smaller neutral than the phase conductors.

Derating

If the neutral carries a substantial current, it will contribute to the overall heat load within the cable. Consider derating the cable capacity accordingly. This is especially important if you have multiple conductors bundled together.

Your #8 Idea

#8 (57A) is likely too small. The neutral must be able to handle the maximum possible unbalanced load. It is recommended to keep the neutral the same size as the phase conductors, unless you can ensure that the neutral will not carry the full load.

Recommendations1. Custom Cable is Preferred

If budget and lead time allow, a custom cable assembly is the cleanest and most professional approach.2.

Calculate Neutral Load

Accurately determine the maximum unbalanced load you anticipate. This is crucial for correctly sizing the neutral conductor.3.

Consult a Qualified Electrician

I strongly recommend consulting a qualified electrician for this installation. They can: Help you size the conductors correctly, taking into account voltage drop, ambient temperature, and derating factors. Ensure compliance with all applicable codes (NEC, local codes). Make sure the ATS is properly integrated and the system is safe.

Additional Safety Notes



Grounding

Ensure proper grounding of the generator, the equipment shed, and all associated equipment. This is critical for safety.

Overcurrent Protection

The 60A breaker on the generator should protect the cable. The ATS should have its own overcurrent protection.

Lockout/Tagout

Implement proper lockout/tagout procedures during any maintenance or modifications to the system.

Testing

After installation, test the entire system to ensure proper operation and safety.*

ATS Compatibility

Verify that the ATS is compatible with your generator's voltage, frequency, and control signals.

In summary, while DIY is possible, a 3-phase generator connection to an ATS is a complex project that requires careful planning and execution. Engaging a qualified electrician is highly recommended to ensure safety and code compliance. Flag for review