2.7 KiB
id, aliases, tags, title
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Raceway Terms |
Raceway Terms
"Raceway"
!nfpa-70_100_definitions#Raceway.
"Duct"
[!quote] NEC 310.2 Definitions Electrical Ducts. Electrical conduits, or other raceways round in cross section, that are suitable for use underground or embedded in concrete.
[!info] Duct Bank "Duct bank" is not given explicit definition in the NEC, however it is used frequently to refer to any group of ducts, even as few as one, as shown in Figure 310.60(C)(3). It is always spelled as two words.
"Wiring Method"
"Wiring method" is not given explicit definition in the NEC.
!nfpa-70_110_requirements#110.8 Wiring Methods
!nfpa-70_300_general-requirements#300.1(A) All Wiring Installations.
Nor is wiring installation, however by closest definition it can be assumed premises wiring includes all wiring installations.
!nfpa-70_100_definitions#Premises Wiring (System).
Inappropriate Use
Notably, Chapter 3 does not prescribe requirements for raceway, but for wiring installations. As such, conduit used for other purposes (e.g. routing beverage tubing) is out of scope.
Raceways used for supporting communications cables would be out of scope, except for Article 800.110:
[!quote] NEC 800.110(A)(1) Raceways Recognized in Chapter 3 Communications wires and cables shall be permitted to be installed in any raceway included in Chapter 3. The raceways shall be installed in accordance with the requirements of Chapter 3.
Raceway is not a wiring method unless it is used to support premises wiring, which communications cabling is not.
It is not appropriate to say "EMT conduit is a wiring method" (granted the NEC does use similar phrasing occasionally), because any recognized wiring method must include the
- wiring,
- splices,
- pull boxes,
- outlet boxes,
- and supports necessary of a complete wiring installation, each of which has countless options.
Appropriate Use
It may be appropriate to refer to "MC cable" as a wiring method if you and your audience understand the name as shorthand for a more specific, standard framework.
In a robustly implemented specification-based takeoff software, an assembly's specifications would describe it's wiring methods. A 20A and 30A branch circuit may utilize identical "wiring methods".
Takeaways
No part of a manufactured cable assembly (e.g. MC cable) can be considered a raceway.
It is usually incorrect to refer to wiring methods in the singular (e.g. installed in a wiring method).