Understanding the 75°C vs 90°C column in Ampacity Table...
May 5, 2025 · 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 …
NEC says MC & EMT can be unstrapped when run through...
Jun 25, 2022 · Can I get some verification that I'm interpreting NEC correctly here? I'm not asking what's the best practice. I'm asking on the proper interpretation of the code. I've gotten in numerous …
Table 300.5 interpretation - Electrician Talk
Oct 16, 2023 · 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 …
Gas station wiring requirements - Electrician Talk
Apr 13, 2023 · 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. …
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 …
Required Clearance - Electrician Talk
Dec 19, 2022 · Good Morning Everyone, I Recently obtained a lead on a service upgrade. My question to the community pertains to working clearance of other utilities. I could not find any references in the …
NEC 334.30 Securement Requirements for NM Cable Fished...
Jan 24, 2023 · I know 334.30(B)(1) (quoted below) has been discussed here before, but I haven't seen a satisfying answer to my particular question. I recently had a discussion with an inspector about the …
Is there a Resistivity of Conductors (K) chart in the NEC?
Sep 15, 2010 · The K factor isn't specifically stated in the NEC, but wire sizes and their circular mils and resistance are. Using these, you can derive it from the tables in the NEC. For example, Chapter 9, …
NEC Article about mixed voltages in conduit - Electrician Talk
Jul 8, 2017 · What article states that it is not permissible to mix voltages in the same conduit?
NEC and running multiple 3 Phase feeders in single conduit
Jan 9, 2025 · Does NEC allow running multiple 480V 3 Phase Power load conductors in a single conduit instead of running each 3 phase loads conductors in separate conduits?