Okay, let's break down your questions about 2020 NEC compliance with these grouped disconnects.

General Thoughts on 2020 NEC Compliance Regarding Grouped Disconnects

The 2020 NEC significantly tightened up requirements related to outside disconnects, emergency disconnects, and the number of service disconnects permitted. Here's a summary of the key points that are likely relevant to your situation: 230.71 Maximum Number of Disconnects

This is a core principle. The NEC generally limits the number of service disconnects at a building. The primary rule is that you can't have more than six service disconnects for each service. This is the infamous "six handle rule."

230.71(A) Grouping of Disconnects

This is where your question about "grouped" disconnects comes in. The NEC requires these disconnects to be grouped in a readily accessible location. "Readily accessible" is a defined term meaning capable of being reached quickly for operation, renewal, or inspection, without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth.

230.85 Emergency Disconnects

This is specifically about dwelling units, and often applies to single-family homes. It mandates an emergency disconnect located outside the building. This is often called a "fireman's disconnect".

Meter Mains vs. Grouped Disconnects

A meter main can be a service disconnect. The critical question is whether each breaker in your scenario is capable of disconnecting the entire service. If the load from the Meter Main or Grouped Disconnects supplies more than one building or structure, there could be additional requirements.

Analysis of Your Specific Scenario

Based on your description of "two grouped disconnects," here's how to think about the situation in light of the NEC:1. Are They Service Disconnects? The most critical question is whether these are actually service disconnects. A service disconnect is the means to shut off ALL power to a building. This usually includes a main service panel.2. Grouping

Since they are “grouped,” that part seems compliant with 230.71(A) as long as they are readily accessible.
3.

Number of Disconnects

If these are your only service disconnects, then two disconnects are compliant with the six-disconnect rule. If there are other ways to disconnect all power to the building from the outside, then you need to count them.4.

Emergency Disconnect (230.85)

This depends on whether this installation is for a dwelling unit (single-family home, etc.). If it is, you likely need an emergency disconnect that is located outside. It is important to note if these disconnects you mentioned are separate from the emergency disconnect required by 230.85.

Important Considerations and Questions to Ask Yourself



What is the Power Source? Is the building fed by a single service drop or lateral? Or are there multiple services? Each service gets its own set of up to six disconnects. Local Amendments

Many jurisdictions amend the NEC. Check with your local electrical inspector or building department to see if there are any local requirements that go above and beyond the NEC. Emergency disconnect requirements vary widely by locality.

Inspector's Interpretation

Ultimately, the Authority Having Jurisdiction (AHJ), usually the electrical inspector, has the final say. Discuss your plans with them before you start work to avoid costly rework.

Q2150MRBE Disconnect and Reversing It

Regarding the Square D Q2150MRBE disconnect: Generally NO, Do NOT Reverse

Disconnects and breakers are typically designed for current to flow in a specific direction. Reversing them can compromise their ability to interrupt fault current safely and may violate their listing.

Check the Manufacturer's Instructions

The only way to know for sure is to consult the manufacturer's documentation for the Q2150MRBE. Look for specific instructions on whether it's permissible to reverse the orientation. Square D has excellent technical support.

Code Violations

Reversing equipment contrary to the manufacturer's instructions violates 110.3(B) of the NEC, which requires equipment to be installed and used according to its listing and labeling.*

Reason for Reversal

What is the motivation for wanting to reverse it? There might be a better solution, such as using a different enclosure or a different type of disconnect altogether.

In summary

Be very careful with the reversal of a disconnect as it is likely prohibited by 110.3(B) as it goes against the instructions that came with the equipment.

Disclaimer: This information is for general guidance only. Consult with a qualified and licensed electrician or electrical engineer for any electrical work or code compliance questions. Electrical work can be dangerous, and improper installations can cause fire or injury. Flag for review