You've hit on a common point of confusion. Let's break it down: 200.2 Identifies a General Rule

It states that the continuity of the grounded conductor cannot rely on a metal enclosure, raceway, or cable armor for its continuity. This is a fundamental safety principle for equipment grounding and fault clearing.

300.13(B) Clarifies MWBC Neutral Continuity

This section specifically addresses the dangerous situation of a lost neutral in a multiwire branch circuit. The focus here is preventing overvoltage damage due to unbalanced loads.

Receptacles and Continuity

You're right to question whether daisy-chained receptacles violate the spirit of maintaining neutral continuity. In your scenario, removing a receptacle does interrupt the neutral path to downstream devices.

Here's why standard daisy-chained receptacles on a single-circuit, non-MWBC are generally considered acceptable


Code Doesn't Explicitly Prohibit It

The NEC does not specifically prohibit daisy-chaining receptacles on a single circuit. If the code wanted to prohibit this, it would have to address the specific use of standard receptacle terminations to maintain conductor continuity.2.

Single Point of Failure

While a removed receptacle breaks the neutral, it's essentially a single point of failure. The worst outcome is that downstream devices simply lose power, similar to opening a switch or unplugging a device.3.

Difference from MWBC Hazard

This is the critical distinction. A lost neutral in an MWBC creates a voltage imbalance due to series-connected loads, potentially causing overvoltage damage. A lost neutral in a single circuit only results in a loss of power downstream.4.

Practicality and Common Practice

Pigtailing every receptacle connection is more labor-intensive. The NEC generally balances safety with practicality.

Where Pigtailing is Required or Highly Recommended



Critical Circuits

In situations where uninterrupted power is essential (e.g., life safety systems, critical equipment), pigtailing is often specified to minimize the risk of a single point of failure.

High-Usage Circuits

Circuits serving frequently used receptacles, where the risk of receptacle failure or removal is higher, would benefit from pigtailing.

Specification by Engineers/Designers

Project specifications can always exceed the minimum requirements of the NEC and mandate pigtailing.

Quality/Longevity

Pigtailing terminations offer a more reliable connection for the long term because the wire is bent, cut, and worked on far less than when it is looped under a receptacle termination.

Your Colleague's Disagreement

Your colleague's concern isn't entirely unfounded. There's an argument to be made that pigtailing is a more robust and reliable wiring method. However, unless specifically required by project specifications or a local amendment to the NEC, daisy-chaining standard receptacles on single branch circuits is generally accepted as meeting minimum code requirements.

In summary: Daisy-chaining receptacles on a single-circuit, non-MWBC is a potential point of failure, but it doesn't create the same hazardous voltage imbalance as losing a neutral in an MWBC. The NEC does not explicitly prohibit this practice. Pigtailing is a better wiring method in many cases, but it's not typically a required one (except in specific situations).Always check with your local AHJ (Authority Having Jurisdiction) for their interpretation and enforcement of the code in your area. They may have local amendments or interpretations that affect this practice. Flag for review