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Understanding the 75°C vs 90°C column in Ampacity Table. . . The columns indicate how much amperage is required to raise the temperature of that size conductor to that column's temperature under standardized conditions So a 2 0 XHHW will reach 75°C at 135A and 90°C at 150A The wire insulation is good for 90°C, so for sizing the wire, we can use the
Branch Circuits - Electrician Talk Branch circuits The distinction between a branch circuit and a feeder can be a source of confusion for the Code user The first step in eliminating this confusion is to understand that the NEC defines a branch circuit as “the conductors between the branch-circuit final overcurrent device protecting the circuit and the outlets” (such as receptacles or lights) [Article 100]
Equipment room receptacle. - Electrician Talk NEC 2020, 210 63 (B) now requires a receptacle outlet in electrical rooms containing panelboards, switchboards, or switchgear The intent is to ensure there’s a convenience outlet for servicing the electrical equipment (like plugging in test equipment, task lighting, or even a laptop)
EMT Fittings for Damp Locations. - Electrician Talk Here’s 2023 NEC Same wording I included the Enhanced Content 225 22 Raceways on Exterior Surfaces of Buildings or Other Structures Raceways on exteriors of buildings or other structures shall be arranged to drain and shall be listed or approved for use in wet locations ENHANCED CONTENT If raceways are exposed to weather or temperature changes, condensation is likely to occur, causing
High bays hanging from rigid conduit - Electrician Talk My AI NEC assistant tells me this is permissable Yes, the National Electrical Code (NEC) allows luminaires (light fixtures) to be supported by a chain from a rigid conduit under specific conditions
Orange, Brown and Yellow Conductor Colors - Electrician Talk The NEC requirements for marking color, are only for grounded and grounding conductors The consensus here, least where I live, is 480v 3p Brown Orange Yellow 277v is colored conductor and Gray grounded conductor 120 208v 3p is Black Red Blue 120 240 Delta is same with high leg marked red or orange
Continuous Load: what is maximum current | Electrician Talk From the 2023 NEC Article 100 Definition: Continuous Load: A load where the maximum current is expected to continue for 3 hours or more 210 20(A) Continuous and Noncontinuous Loads "Where a branch circuit supplies continuous loads or any combination of continuous and noncontinuous loads
Line load same conduit - Electrician Talk Is it against nec to run line and load in the same conduit to A fused 30 amp disconnect ? Running line and load in the same conduit is generally fine as long as it's rated for the ampacity and meets NEC requirements Proper separation and conduit fill calculations are key to avoid overheating I was unsure about ordering a paper online, but my classmate told me to check the DoMyPaper samples
Table 300. 5 interpretation - Electrician Talk For a given column of Table 300 5 ("minimum cover requirements") there is a potential overlap of the various rows The one that concerns me at present is Column 2 (IMC and RMC conduit) If it's buried in a trench below 2" of concrete or equivalent, but also goes under a parking area in a