Okay, let's break down the disconnect requirements for direct-connected refrigerated cases in grocery stores under NEC 2017.

Understanding the Situation "Direct-Connected": This means the cases are hard-wired into the electrical system, not plugged into receptacles. Locations: Aisle and checkout areas. Refrigerated Cases: These contain refrigeration systems with compressors and other motor-driven components.

Do They Require a Disconnect?Yes, almost certainly. The NEC mandates disconnects for equipment that needs to be serviced, maintained, or in emergency situations. Refrigerated cases fall into this category. The intent is to provide a way to safely de-energize the equipment.

Which Article Applies?

This is the most crucial question. Here's a breakdown of which NEC article to consider and why: Article 440: Air-Conditioning and Refrigeration Equipment: This is the primary article that will govern your installation. It specifically addresses the electrical requirements for equipment with hermetic refrigerant motor-compressors, which are common in refrigerated cases. Even if the refrigeration system is small, this Article most likely applies. Article 430: Motors, Motor Circuits, and Controllers: This article will supplement Article 440. Article 440 refers to Article 430 for motor-specific requirements that are not covered in Article 440. Article 422: Appliances: This article is unlikely to be the primary governing article. While a refrigerated case could technically be considered an appliance, Article 440 takes precedence for refrigeration equipment containing motor-compressors.

Why Article 440 is Key

Article 440 provides specific requirements for disconnects based on the motor-compressor's horsepower/amperage and the nature of the refrigeration system.

Key NEC 2017 Requirements from Article 440 that often apply 440.11 Accessibility: The disconnecting means must be readily accessible. It can't be blocked by stock or other obstructions. 440.14 Location: The disconnecting means must be located within sight from the equipment and be readily accessible. The disconnect cannot be more than 50 feet from the equipment. If the equipment is not within sight, it must be capable of being locked in the open position. 440.12 Rating and Type: The disconnecting means must have an adequate ampacity rating for the motor-compressor's locked-rotor current and the branch-circuit overcurrent protective device. 440.14 Voltage Rating: Disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident.

Important Considerations and Common Scenarios1. Unit Disconnect vs. Panel Disconnect



Unit Disconnect

The ideal and often required scenario is a disconnect switch located right at (within sight of, and accessible) the refrigerated case. This is the most common and safest practice.

Panel Disconnect with Lockout/Tagout

In some cases, if the panel is readily accessible and within sight, and if a strict Lockout/Tagout (LOTO) procedure is enforced, using a breaker in the panel as the disconnecting means might be acceptable to the AHJ (Authority Having Jurisdiction - the electrical inspector). However, this is generally frowned upon, and a local disconnect at the unit is almost always preferred.2.

Multiple Motor-Compressors

If the refrigerated case has multiple compressors, each compressor must have its own disconnecting means, or a single disconnecting means must be rated to handle the combined load.3.

"Within Sight From": "Within sight from" means visible and not more than 50 feet away.4. Lockable Disconnects

The disconnect must be capable of being locked in the open (OFF) position for servicing if it's not within sight of the equipment.5.

Cord-and-Plug Connected Equipment Article 440 does not specifically address disconnect requirements for cord-and-plug connected appliances. Consult Article 422.31, for appliances rated over 300 volt-amperes or 1/8 horsepower.
6. Marking: The disconnect switch must be clearly labeled to indicate what equipment it disconnects.

Steps to Determine the Correct Disconnect1. Gather Equipment Information

Obtain the nameplate data from the refrigerated case(s), including: Voltage Full-Load Amps (FLA) of the motor-compressor(s) Locked-Rotor Amps (LRA) of the motor-compressor(s) Minimum Circuit Ampacity (MCA) Maximum Overcurrent Protective Device (MOCP)2.

Consult NEC Article 440

Use the data from the nameplate and the requirements of Article 440 to determine the appropriate disconnect switch type, rating, and placement.3.

Check Local Codes

Verify that there are no local amendments or requirements that differ from the NEC. Your local jurisdiction may have stricter rules.4.

Consult with an Electrical Inspector

It's always a good idea to discuss your installation plan with the local electrical inspector before starting the work to ensure compliance.

Example Scenario

Let's say you have a refrigerated case with the following nameplate data: Voltage: 120V FLA: 8A LRA: 40A* MOCP: 20AAccording to the NEC and Article 440, you would need a disconnect switch rated for at least 20A (to match the MOCP) and suitable for use at 120V. The disconnect must be readily accessible and within sight of the refrigerated case.

In summary, direct-connected refrigerated cases in grocery stores almost always require a disconnecting means. Article 440 of the NEC 2017 is the primary governing article. The disconnecting means must be readily accessible, within sight (or lockable), and properly rated for the equipment. Always consult with a qualified electrician and the local electrical inspector to ensure full compliance. Flag for review