You are correct that NYC generally prohibits PVC-coated MC cable underground in residential buildings with 3+ units. This is likely due to concerns about corrosion and the potential for water ingress.Regarding alternatives, yes, there are MC cables suitable for underground use that are not PVC coated. Here's what you need to look for

Options:

1. MC-HL (Hazardous Locations) Cable

This is your best bet. MC-HL is designed for direct burial and hazardous locations. It typically has a thicker, corrosion-resistant aluminum jacket (or copper) and is often filled with a sealant compound to prevent water penetration. Crucially, it does not rely on a PVC coating for its underground rating. Check the product specifications carefully to verify it's rated for direct burial and wet locations, and ensure it complies with the NYC requirements that apply to it.2.

Lead-Covered MC Cable

While less common today, lead-covered MC cable is highly resistant to moisture and chemicals. This would be a very traditional solution. It's more expensive and requires specialized installation techniques (like proper bonding).3.

Copper-Jacketed MC Cable

MC cable with a solid copper jacket provides excellent corrosion resistance, though it is very expensive. It would be rated for wet locations, and could be installed in a conduit run underground.4.

MC Cable in Conduit

While your original question was specifically about avoiding PVC-coated MC, you can use standard MC cable (suitable for wet locations) inside a rigid metal conduit (RMC) or intermediate metal conduit (IMC) run underground. In this scenario, the conduit provides the primary protection against moisture and physical damage. This gives you a much wider range of MC cable choices. Note: Avoid PVC conduit underground in NYC multi-unit dwellings.

Important Considerations



Verify Ratings

Always check the cable's markings and the manufacturer's specifications to ensure it is explicitly rated for direct burial and wet locations. The "wet location" rating is critical for underground use.

NYC Amendments

Always consult the latest version of the NYC Electrical Code and any relevant amendments. Local interpretations can vary.

AHJ Approval

It's always a good practice to discuss your proposed wiring method with the local Authority Having Jurisdiction (AHJ) before starting the work. They can confirm compliance with the code and any local requirements.

Corrosion Considerations

Even with corrosion-resistant cables, consider soil conditions. Highly acidic or alkaline soils can accelerate corrosion. In such cases, additional protection (like wrapping the cable with a corrosion-resistant tape) might be recommended.

Depth of Burial

Follow the code's requirements for burial depth. This protects the cable from physical damage.

Grounding and Bonding

Proper grounding and bonding are essential for safety. Use appropriate grounding conductors and bonding connectors.*

Professional Installation

For complex installations like underground wiring, it's always best to hire a licensed electrician who is familiar with the NYC Electrical Code and local practices.

In Summary:

MC-HL cable is likely your best solution. Make sure it's specifically rated for direct burial and wet locations, and that it meets NYC requirements. Talk to the AHJ for confirmation and consult a qualified electrician for the installation. Flag for review