95 lines
2.8 KiB
Markdown
95 lines
2.8 KiB
Markdown
---
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title: Raceway Terms
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tags:
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- destiny/fleeting
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- topic/construction/electrical
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- type/encyclopedia
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up: "[[electrical-construction]]"
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---
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# Raceway Terms
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## "Raceway"
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![[nfpa-70_100_definitions#Raceway.]]
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### "Duct"
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> [!quote] NEC 310.2 Definitions
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> **Electrical Ducts.**
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> Electrical conduits, or other raceways round in cross section,
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> that are suitable for use underground or embedded in concrete.
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> [!info] Duct Bank
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> "Duct bank" is not given explicit definition in the NEC,
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> however it is used frequently to refer to any group of **ducts**,
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> _even as few as one_, as shown in Figure 310.60(C)(3).
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> ==It is always spelled as two words.==
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## "Wiring Method"
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"Wiring method" is not given explicit definition in the NEC.
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![[nfpa-70_110_requirements#110.8 Wiring Methods]]
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![[nfpa-70_300_general-requirements#300.1(A) All Wiring Installations.]]
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Nor is wiring installation,
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however by closest definition
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it can be assumed **premises wiring**
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includes all wiring installations.
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![[nfpa-70_100_definitions#Premises Wiring (System).]]
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### Inappropriate Use
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Notably, Chapter 3 does not prescribe requirements for _raceway_,
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but for _wiring installations_.
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As such, conduit used for other purposes
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(e.g. routing beverage tubing) is out of scope.
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Raceways used for supporting communications cables
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_would be_ out of scope, except for Article 800.110:
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> [!quote] [[nfpa-70_800#800.110(A)(1) Raceways Recognized in Chapter 3.]]
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> Communications wires and cables shall be permitted
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> to be installed in any raceway included in Chapter 3.
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> _The raceways shall be installed in accordance_
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> _with the requirements of Chapter 3._
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Raceway is not a _wiring method_
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unless it is used to support _premises wiring_,
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which communications cabling is not.
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It is not appropriate to say "EMT conduit is _a_ wiring method"
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(granted the NEC does use similar phrasing occasionally),
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because any recognized wiring method must include the
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* wiring,
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* splices,
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* pull boxes,
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* outlet boxes,
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* and supports
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necessary of a complete wiring installation,
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each of which has countless options.
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It may be more consistent with NEC phrasing
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to say that each component is _a_ wiring method,
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but this is less consistent with common use.
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### Appropriate Use
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It may be appropriate to refer to "MC cable" as _a_ wiring method
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if you and your audience understand the name as shorthand
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for a more specific, standard framework.
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In a robustly implemented specification-based takeoff software,
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an assembly's specifications would describe its wiring methods.
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A 20A and 30A branch circuit may utilize identical "wiring methods".
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## Takeaways
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No part of a manufactured cable assembly (e.g. MC cable)
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can be considered a raceway.
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It is usually incorrect to refer to wiring methods
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in the singular (e.g. installed in _a_ wiring method).
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