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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
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:
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
Gas station wiring requirements - Electrician Talk NEC 2017 514 8 Underground Wiring ENHANCED CONTENT Fuel spilled in the vicinity of gasoline dispensers seeps into the ground and could migrate into underground electrical conduits Therefore, all conduits installed below the hazardous locations of a motor fuel dispensing facility are required to be sealed within 10 feet of the point of emergence from below grade This boundary seal minimizes
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
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
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 screws - Electrician Talk Bob Badger said: There is no code to give you, the NEC does not say 'ground screws do not have to be green' the NEC just never requires box grounding screws to be green Yes if it has machine threads, see 250 8 Oh no not another box grounding thread Maybe this one won't turn into "my way is common sense and just as good" like the last one did
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
80% rule? - Electrician Talk 80% rule applies to continious loads such as motors, lighting or any load expected to be on 3 hours or more A breaker is rated for 100% of the noncontinious load which may include outlets or other small appliances There are fully rated breakers panels that are rated for continious use And will be listed for this application It is a good practice to load branch circuits to a fraction of