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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
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
PowerPoint Presentation The NEC does not define ranges, ovens or cooktops but based on manufacturers usage a range is a unit that has a cooktop and oven built together in one appliance An oven is just a single or double appliance for baking , roasting, etc A cooktop is just the burners without the oven
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
Circuits from multiple sources in the same conduit. Is there any code against having wires from multiple power sources using the same conduit? I know article 300 says your aloud to use the same conduit for different voltages as long as all wires are rated for highest voltage present, and different voltages would mean different power sources I
Inconsistent Confusing Conduit Fill Calculation. - Electrician Talk Thanks for the feedback The way the calculator works is based in the National Electrical Code (NEC) Chapter 9 Table 1 that specifies the maximum percentage of a conduit that can be filled with conductors: One conductor: 53% of the conduit's space Two conductors: 31% of the conduit's space (this is the maximum allowable fill for conduit with 2 conductors, in your case the two 6 AWG calculation
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
What are appliances and when is a disconnect required? So appliances, as defined by the NEC, are equipment for HVAC, clothes washing, electronics, food, lighting, chemicals, or "similar purposes" which are installed as part of, or in connection with, an electrical installation Which is basically everything you could possibly install in a residential setting
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