Code Change Summary: The rules for installing raceways in complete runs were relocated, reformatted into a list, and clarified in Section 300.20(A).

SME commentary: In the 2026 NEC^®, the previous requirements from Section 300.18(A) have been relocated to 300.20(A) and reformatted into a list for easier application and compliance with the NEC^® Style Manual. This revision is significant for both usability and enforceability, as it transforms what was previously a dense block of text with an exception into a clear, itemized list. In addition, the former exception has been converted into positive code text and integrated as one of the listed provisions. This approach aligns with Section 2.1.9.1 of the NEC^® Style Manual, which directs that exceptions should be avoided and replaced with positively worded requirements whenever possible.

The core intent of the previous code language remains unchanged. The requirement continues to state that raceways must be installed as complete runs between outlets, junctions, or splicing points before conductors or cables are pulled in. However, the list structure now makes it much clearer where special provisions apply and conductors can be pulled before the raceway has been completed. For example, the list specifically allows busways, listed manufactured assemblies in accordance with 604.100, exposed raceways with hinged or removable covers, and prewired assemblies where specifically permitted. It also addresses situations where a raceway may initially be installed without terminating connections at the equipment if necessary to facilitate installation of utilization equipment. Lastly, it allows short sections of raceway to be installed solely for the protection of conductors or cables from physical damage, eliminating the need for those short runs to be continuous between junctions or outlets.

A practical application of item (4) in 300.20(A) illustrates its importance in day-to-day construction. Where required to facilitate the installation of utilization equipment, a raceway is permitted to be initially installed without a terminating connection at the equipment. Consider a commercial grocery store project where checkout station cabinetry and fixtures will arrive late in the construction schedule. An electrician may rough-in a length of flexible metal conduit with conductors extending from the finished wall or floor in anticipation of the equipment’s arrival. Once the checkout counters are delivered and installed, the raceway can then be terminated and the wiring properly connected to the equipment. This allowance ensures that project schedules remain on track, while still maintaining compliance with the NEC^®. Without this provision, contractors would be forced either to delay the final wire pull until fixtures arrive or to violate the rule by leaving un-terminated conduit runs with wires hanging out, both of which create unnecessary complications.

It is important to note that while the structure and wording in 300.18(A) have been updated, the technical requirements remain consistent with prior editions. The change does not introduce new allowances or restrictions beyond what was previously permitted in 300.18(A). Instead, it provides clarity by reorganizing the material into a more accessible format.

Below is a preview of the NEC^®. See the actual NEC^® text at NFPA.ORG for the complete code section. Once there, click on their link to free access to the 2026 NEC^® edition of NFPA 70.

2023 Code Language:

300.18(A) Complete Runs. Raceways other than busways, listed manufactured assemblies in accordance with, or exposed raceways having hinged or removable covers shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors or cables. Where required to facilitate the installation of utilization equipment, the raceway shall be permitted to be initially installed without a terminating connection at the equipment. Prewired raceway assemblies shall be permitted only where specifically permitted in this Code for the applicable wiring method.

Exception: Short sections of raceways used to contain conductors or cable assemblies for protection from physical damage shall not be required to be installed complete between outlet, junction, or splicing points.

2026 Code Language:

300.20(A) Complete Runs. Raceways shall be installed complete between outlet, junction, or splicing points prior to the installation of conductors or cables, unless permitted by one of the following:

(1) Busways

(2) Listed manufactured assemblies in accordance with 604.100

(3) Exposed raceways having hinged or removable covers

(4) Raceways installed without terminating connections at the equipment, where required to facilitate the installation of utilization equipment

(5) Prewired raceway assemblies, only where specifically permitted in the code for the applicable wiring method

(6) Short sections of raceways used to contain conductors or cable assemblies for protection from physical damage