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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
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
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
Ground rod horizontal in ditch - Electrician Talk Grounding in NEC has become a cruel joke It’s like tge stupid 25 ohm maximum rule, OR just use 2 rods Granted the Earth electrode isn’t as critical as they make it out to be, or they would just stop with saying 25 ohms or less and basically we don’t care how you get there I’m not a fan though of anything but a single point ground rod
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
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
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
Show window receptacles - Electrician Talk 2020 NEC 210 62 Show Windows At least one 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed within 450 mm (18 in ) of the top of a show window for each 3 7 linear m (12 linear ft) or major fraction thereof of show window area measured horizontally at its maximum width