55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
---
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id: 2025-11-10T11:14:00-0500
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title: 2025-11-10 11:14:??
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tags:
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- occupational/takeoff
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- original-format/digital-text
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daily: "[[2025-11-10]]"
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---
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# 2025-11-10 11:14:??
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I was updating my notes,
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filling in gaps in scripts based on [[joel-jansen]]'s,
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when I noticed a strange paragraph:
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> [!quote] `OneNote`/`Joel Take-off`/`Misc. Notes`
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> Drop Down Ceilings vs. GWB (Gypsum Wall Boards)
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>
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> Drop down ceiling is technically "Exposed" (the real term should be accessable),
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> so Romex and SER is not permited. Will need to use MC.
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>
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> > [!image]
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> > ### 334.12 Uses Not Permitted.
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> >
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> > #### 334.12(A) Types NM and NMC.
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> >
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> > Types NM and NMC cables shall not be permitted as follows:
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> >
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> > 1. In any dwelling or structure not specifically
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> > permitted in 334.10(1), (2), (3)
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> >
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> > 2. ==Exposed in dropped or suspended ceilings==
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> > in other than one- and two-family and multifamily dwellings
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This analysis of 334.12(A)(2) is flawed.
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Based on the [[nfpa-70_100_definitions|Article 100]] definitions
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of [[nfpa-70_100_definitions#Exposed (as applied to wiring methods).|exposed]]
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and [[nfpa-70_100_definitions#Dwelling, Multifamily.|dwelling]],
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334.12(A)(2) can be paraphrased as follows:
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> [!cite] [[nfpa-70_334_nm-cable#334.12(A) Types NM and NMC.|NEC 334.12(A)(2)]] (pp.)
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> Types NM and NMC cable are not permitted to be installed
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> in accessible spaces above suspended ceilings,
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> _except in buildings containing one or more dwelling units._
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The prohibition of 334.12(A)(2) _never_ applies to apartments or condos,
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And only applies to hotels and dormitories on a basis of AHJ interpretation
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(See [[multi-family-dwellings#Are Hotels Multifamily Dwellings?]]).
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It's unclear to me if this a genuine misunderstanding
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or just a [[heuristics|rule of thumb]] to cover the case
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that guestrooms are not interpreted to be dwelling units.
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If it's the latter, I believe it's far too conservative
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to be used whole-cloth on all estimates.
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