You've hit on a tricky point with portable DC fast chargers and NEC compliance, particularly with 625.44(A). Let's break it down

The Issue: NEC 625.44(A) and "Readily Accessible" Disconnects
NEC 625.44(A) generally requires a readily accessible disconnect external to the charging equipment for all EVSE. "Readily accessible" means it can be reached quickly without climbing over obstacles, moving things, etc. Think within arm's reach in normal circumstances. Portable chargers blur the line. The intent of 625.44(A) is for safety during maintenance or emergencies. A permanently mounted disconnect gives first responders or service personnel a way to quickly kill power to the EVSE. With a portable charger, the "disconnect" could be the cord and plug itself, but there's debate on whether that satisfies the intent and letter of the code.

Why Portable DC Fast Chargers Raise Red Flags1. High Voltage and Current

DC fast chargers at 480V/3 deliver significant power. A fault condition could be very dangerous, and quick disconnect is crucial. Just yanking the cord on a high-power 480V connection under load isn't a safe or recommended procedure.2.

Cord and Plug as "Disconnect"?

Some argue the cord and plug could serve as the disconnect. However, many inspectors and Authorities Having Jurisdiction (AHJs) will not accept a cord and plug alone as a sufficient disconnect for a DC fast charger due to the safety concerns mentioned above. Remember, the disconnect is supposed to be readily accessible during emergencies by anyone, not just a qualified electrician.3.

Location, Location, Location

The location of the portable charger significantly impacts code interpretation.

Inside a shop

More likely to require a hardwired disconnect switch due to the expectation of maintenance and potential for misuse.

Outside in a public area

Even more scrutiny. You'd almost certainly need a lockable, external disconnect for safety and code compliance.

Common Approaches and Solutions1. External Disconnect Switch

The most common (and safest) approach is to install a properly rated, readily accessible, external disconnect switch upstream of the receptacle where the portable charger plugs in. This is typically a fused or non-fused disconnect switch mounted on a wall or pole.

Important Considerations



Amperage Rating

Must be rated for the maximum current draw of the charger plus a safety factor (typically 125% of the charger's nameplate current, or as required by your AHJ).

Voltage Rating

Must be rated for 480V.

Lockability

Should be lockable in the open (off) position for safety during maintenance.

Location

"Readily accessible" - near the charging location, not blocked, not requiring tools to access.2.

Specific Charger Design

Some manufacturers of portable chargers are aware of this issue and design their chargers with integrated disconnect mechanisms within the charger itself, which might satisfy the requirements. However, it is essential that these disconnects are:

Clearly labeled and easy to use. Meet relevant safety standards. Approved by a nationally recognized testing laboratory (NRTL) like UL or ETL.3. Variance/Special Permission

In rare cases, you might be able to obtain a variance or special permission from the AHJ, but this is unlikely for DC fast chargers due to the safety concerns. You'd need a very compelling argument and a robust safety plan.

Recommendations1. Consult with Your AHJ

This is the most important step. Talk to your local electrical inspector before you buy anything. Explain your plans, show them the charger specifications, and ask what they will require for compliance with NEC 625.44(A) (and any other relevant local codes). Get it in writing if possible.
2.

Engage a Qualified Electrical Contractor

Have a licensed electrician review the charger specifications, your site, and install the necessary wiring and disconnect equipment. They will be familiar with local codes and can ensure a safe and compliant installation.3.

Carefully Review Charger Documentation

Look for information in the charger's documentation regarding compliance with NEC 625, NRTL listings, and integrated disconnect features.4.

Consider the Overall Cost

Don't forget to factor in the cost of the disconnect switch, wiring, conduit, permits, and labor when budgeting for your portable charger.

In Summary

While portable DC fast chargers exist, ensuring they meet NEC 625.44(A) requirements can be challenging. A readily accessible disconnect is almost certainly required, and the cord and plug alone are unlikely to suffice. Early and frequent communication with your AHJ and a qualified electrician is crucial for a safe and code-compliant installation. Don't cut corners on safety – these are high-power devices. Good luck! Flag for review