You're right to question that interpretation of 230.71(B)(3) in the context of NYC's adoption of the 2020 NEC with amendments. It's crucial to understand how NYC's amendments modify the NEC language.Here's a breakdown to help clarify: NEC 2020, Article 230.71(B)(3)

This section deals with the grouping of service disconnects. It generally aims to have service disconnects grouped together in a readily accessible location. Critically, it specifies the maximum number of disconnects permitted in one location. In general, the NEC does permit multiple service disconnects at a single service, with limitations on the number of disconnects (typically six) per service.

The Core Issue: Grouping vs. Single Section

The core question is whether NYC's amendments interpret "grouping" to mean within a single switchboard section. The NEC itself doesn't explicitly prohibit multiple service disconnects within a single vertical section of a switchboard, as long as the total number of service disconnects per service doesn't exceed the limit (usually six). The intent is to prevent a multitude of disconnects spread out over a large area, making it difficult for emergency personnel to de-energize the entire service.

NYC Amendments: The Key to the Puzzle

This is where you need to focus your investigation. You must obtain the official document outlining NYC's amendments to the 2020 NEC. Look for any language specifically related to Article 230, particularly 230.71. Pay close attention to definitions, additions, or modifications of the NEC language.

Here's a possible scenario based on common interpretations and the need for verification with the NYC amendments


NYC May Restrict Disconnects per Section

It's possible NYC's amendments add language stating something along these lines: "Service disconnects shall be limited to one per vertical section of a switchboard. Where multiple service disconnects are required, separate vertical sections shall be used." This would directly prohibit your three disconnects in a single section. This is the scenario you're worried about.2.

NYC May Have No Such Restriction

If NYC's amendments are silent on this specific point (i.e., they don't explicitly prohibit multiple service disconnects within a single switchboard section), then your installation might be compliant if it meets all other NEC requirements (as amended by NYC). This means: The total number of service disconnects for the entire service does not exceed the permitted limit (usually six). The disconnects are clearly labeled and readily accessible. The switchboard is appropriately rated for the service.

Steps to Take


Obtain the Official NYC Amendments

This is non-negotiable. You must have the official document outlining NYC's changes to the 2020 NEC. Contact the NYC Department of Buildings (DOB) or a reputable electrical inspection agency in NYC.2.

Carefully Review Article 230 (and related sections) in the Amendments

Look for any additions, deletions, or modifications to the NEC language, particularly related to grouping, service disconnects, switchboards, or the definition of "location."3.

Consult with a Qualified NYC Electrical Inspector

After reviewing the amendments, discuss your specific situation with a qualified and licensed electrical inspector who is familiar with NYC's electrical code. They can provide an authoritative interpretation.4.

Contact the Switchboard Manufacturer (Siemens)

Siemens should be aware of common interpretations of the NEC and local amendments. They might have documentation or experience with similar installations in NYC. However, always rely on the official code and the interpretation of the local authority having jurisdiction (AHJ).5.

If the Amendments are Unclear, Seek a Formal Interpretation

If you still have doubts after steps 1-4, you may need to submit a formal request for interpretation to the NYC Department of Buildings. This can provide a definitive answer.

In summary, while the NEC itself doesn't automatically prohibit multiple service disconnects in a single switchboard section, NYC's amendments could impose such a restriction. You must thoroughly investigate the NYC amendments to the 2020 NEC to determine the correct interpretation and ensure compliance. Don't rely on hearsay or general assumptions. Get the official document and consult with qualified professionals in NYC. Flag for review