2026-02-05 10:14:01

Mechanical Connection Selection

Relevant to electrical-takeoff, sourced from Joel Jansen's OneNote Takeoff Notes "Mechanical Connections".

Ben says he has never used any PVC assembly except .../PVC - ....

NM Connections

.../NM CABLE ASSEMBLIES

Type III, IV, and V construction. Usually only 6 AWG and smaller; EMT is expected to be cheaper for larger sizes.

MC Connections

.../MC CABLE ASSEMBLIES

Type I and II construction.

[!quote] Paraphrased from Source Usually only short runs, otherwise use PVC if possible.

Important

Note that MC cable may be forbidden for this application.

[!quote] Hampton Roads Navy UH - Newport News, Project Specifications MC cable shall not be allowed for wiring to mechanical equipment except for within the dwelling units.

EMT Connections

.../EMT SS - ...
.../EMT COMP - ...

May be preferred for equipment in the same electrical room as the panel feeding it, otherwise treat as last resort, preferring MC or PVC.

PVC Connections

.../PVC - ...

Use where equipment disconnect is not integral.

.../PVC - ... - PVC CEILING BOX

J-box in the ceiling for mechanical connections, or where a motor-rated switch is shown.

.../PVC - ... - STL BOX & EXT RING

Use for equipment powered from a wall mount j-box

.../PVC - ... - EMT DROP

Assembly Note: Does not include j-box

Use in lieu of .../PVC - ... where drop would be exposed if PVC is not permitted to be exposed.

Also use for J-Boxes for Heaters.

[!example] directional unit heater shown with connection to a flush wall mount j-box

.../PVC - ... - EMT RISE

Assembly Note: Does not include j-box

Use if panels are located on level below panel. EMT covers vertical transition for exposed conduit

.../PVC - MECH CONNECTION - SGL REC
.../PVC - STL BOX W/ EXT RING & COVER

For garage heaters, no labor/power term

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