vault backup: 2025-12-03 17:11:42
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@@ -6,7 +6,7 @@ tags:
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- authorship/other
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- destiny/uncertain
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- exclude-from-word-count
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- status/incomplete
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- status/draft
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- topic/construction/electrical
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- type/media
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title: Article 240 Overcurrent Protection
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@@ -33,9 +33,9 @@ covers overcurrent protection over 1000 volts, nominal.
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> is provided to open the circuit if the current reaches a value
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> that will cause an excessive or dangerous temperature
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> in conductors or conductor insulation.
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> See also [[nfpa-70_110_requirements-for-electrical-installations#110.9 Interrupting Rating.|110.9]]
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> See also [[nfpa-70_110_requirements#110.9 Interrupting Rating.|110.9]]
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> for requirements for interrupting ratings
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> and [[nfpa-70_110_requirements-for-electrical-installations#110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics.|110.10]]
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> and [[nfpa-70_110_requirements#110.10 Circuit Impedance, Short-Circuit Current Ratings, and Other Characteristics.|110.10]]
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> for requirements for protection against fault currents.
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### 240.2 Definitions.
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@@ -160,7 +160,11 @@ Where the overcurrent device is rated over 800 amperes, the ampacity of the cond
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#### 240.4(D) Small Conductors.
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Unless specifically permitted in 240.4(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) after any correction factors for ambient temperature and number of conductors have been applied.
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Unless specifically permitted in [[#240.4(E) Tap Conductors.|240.4(E)]]
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or [[#240.4(G) Overcurrent Protection for Specific Conductor Applications.|240.4(G)]],
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the overcurrent protection shall not exceed that required by (D)(1) through (D)(7)
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after any correction factors for ambient temperature
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and number of conductors have been applied.
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##### 240.4(D)(1) 18 AWG Copper.
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@@ -768,7 +772,7 @@ Where electric service and electrical maintenance are provided by the building m
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Overcurrent devices shall be located where they will not be exposed to physical damage.
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> [!info] Informational Note:
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> See [[nfpa-70_110_requirements-for-electrical-installations#110.11 Deteriorating Agents.|110.11, Deteriorating Agents]]
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> See [[nfpa-70_110_requirements#110.11 Deteriorating Agents.|110.11, Deteriorating Agents]]
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#### 240.24(D) Not in Vicinity of Easily Ignitible Material.
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