Yes, in NYC, electrical contractors are generally required to submit drawings, including a one-line diagram and power layout, for electrical work involving equipment rated 1000 kVA and over to the NYC Department of Buildings (DOB).Here's a breakdown of why and what you need to consider: Permitting Requirements

Any significant electrical work in NYC requires a permit from the DOB. Installing or altering equipment of this size (1000 kVA and over) falls squarely within this category.

Drawing Requirements

As part of the permit application, detailed drawings are crucial. These drawings demonstrate that the proposed electrical system complies with the NYC Electrical Code and all other relevant regulations.

One-Line Diagram

This shows the entire electrical system in a simplified, symbolic format. It includes the transformer, main distribution panel, switchgear, feeders, protective devices (circuit breakers, fuses), and major loads. It indicates voltage levels, kVA ratings, and key equipment specifications.

Power Layout (Floor Plans)

This shows the physical location of the electrical equipment within the building, including the transformer, switchgear, panelboards, and major wiring runs. This helps the DOB understand the spatial arrangement and ensures it meets clearances and other physical installation requirements.

NYC Electrical Code and Other Regulations

The drawings must demonstrate compliance with the NYC Electrical Code (which is based on the National Electrical Code (NEC) with local amendments), as well as other applicable building codes and regulations.

Licensed Professional Requirement: For installations of this scale (1000kVA and over) or complexity, it's highly likely that the NYC DOB will require a Licensed Professional Engineer (PE) to prepare and stamp the drawings. In some cases, a Registered Architect may also be involved, depending on the scope of the overall project. The electrical contractor would typically work with a PE to produce the required drawings. DOB Review

The DOB will review the drawings to ensure they meet all code requirements and are safe and properly designed. They may request revisions or clarifications before approving the permit.

Inspection

After the electrical work is completed, the DOB will conduct inspections to verify that the installation matches the approved drawings and complies with all regulations.

In Summary:

Yes, for electrical projects involving 1000 kVA or more in NYC, the electrical contractor must submit detailed drawings (including a one-line diagram and power layout) to the NYC DOB as part of the permit application process. It is also recommended that a Licensed Professional Engineer (PE) prepares and stamps the drawings because of the complexity and size of the power.It is always best to consult with a qualified NYC-licensed electrical contractor and/or a licensed Professional Engineer familiar with NYC DOB requirements for specific project details. Flag for review