Okay, let's break down the NEC requirements and how they apply to your situation. I'm focusing on the 2008 NEC, as specified.

Key Issues and Considerations1. NEC 110.26(A) - Working Space

This is the primary requirement for working space around electrical equipment. It dictates the depth, width, and height of the required space. The depth of the working space is determined by the voltage to ground, condition of the equipment, and if there are grounded parts/exposed live parts on the opposite side of the working space.2.

NEC 110.26(C)(2)(b) - Extra Working Space

This section is what you're specifically asking about. It requires increased working space if the equipment is located where personnel could be trapped in the case of fire or other emergency. This applies to

one equipment. If you are working on that equipment, where you could be exposed to live parts and get trapped in the event of a fire.

Analysis of Your Situation Equipment Arrangement

You have a CT cabinet facing to the side of a 2000A distribution board. This is important because the CT cabinet isn't directly facing the distribution board.

One Means of Egress

Your electrical room has only one double door for egress. This is the crucial point triggering your concern.

Applying the NEC

Here's the breakdown of how I interpret the 2008 NEC requirements in your specific scenario: Distribution Board Clearance (2000A)

First, you need to determine the required depth of the working space for the 2000A distribution board according to NEC 110.26(A). This depends on the voltage-to-ground and the conditions on the opposite side of the working space (e.g., grounded wall, insulated wall, or another piece of equipment). Now, the question is, does NEC 110.26(C)(2)(b) apply? Here's the key consideration:

Could personnel be trapped? The fact that you only have one egress is highly relevant. If someone is working on that distribution board, and a fire or other emergency blocks the door, they could be trapped. If the distribution board has exposed live parts while being maintained/examined/adjusted... 110.26(C)(2)(b) likely does apply. The working space depth determined in 110.26(A) must be doubled. CT Cabinet Clearance

Again, start with NEC 110.26(A) to determine the basic working space requirements for the CT cabinet. This will be based on its voltage-to-ground. Does NEC 110.26(C)(2)(b) apply to the CT cabinet? This is more nuanced.

Could personnel be trapped specifically working on the CT cabinet? If you're facing the side, while working on the CT cabinet, and a fire blocks the only door, you could be trapped. It's less likely than if the cabinet faced the distribution board. The code says 'could be' and not 'will be'. If the CT cabinet needs examination, adjustment, servicing while energized, then 110.26(C)(2)(b) likely does apply to the CT cabinet also, and its working space must also be doubled. Important Consideration

The CT cabinet's location adjacent to the distribution board influences this. If the working spaces partially overlap or are very close, an inspector might argue that a single emergency could impact both.

Important Considerations and Recommendations1. Local AHJ (Authority Having Jurisdiction)

The most important step is to consult with the electrical inspector or building department in NYC. They have the final say in how the code is interpreted and enforced. Explain your situation and ask for their specific guidance. They may have local amendments or interpretations of the NEC.2.

Documentation

Document your analysis of the code requirements, the arrangement of the equipment, and the basis for your decisions. This will be helpful when discussing the installation with the AHJ.3.

Alternative Solutions



Second Means of Egress

The best solution is to provide a second means of egress from the electrical room. This eliminates the concern about being trapped. This might involve adding another door, a window to a fire escape, etc. This solution avoids the need to double the clearance.

Relocation

Relocate the CT cabinet or distribution board, if possible, to improve egress.

Engineering Judgment

Sometimes, engineering judgment can be used to justify a different approach, especially if the equipment is low-voltage and presents a minimal hazard. However, this requires approval from the AHJ.

In summary, based on your description and the 2008 NEC, the single egress door raises a significant concern under 110.26(C)(2)(b). The working space depth in front of the distribution board AND likely the CT cabinet needs to be doubled. You should consult with the AHJ to get a definitive ruling and explore alternative solutions like a second means of egress.Disclaimer: This information is for guidance only and does not constitute professional engineering or legal advice. Consult with a qualified electrical engineer and the local AHJ to ensure compliance with all applicable codes and regulations. Flag for review