Jim Dollard has an extensive background in codes and standards. Send questions about the National Electrical Code (NEC) to Jim at codefaqs@gmail.com. Answers are based on the 2020 NEC. Service conductors Does the NEC permit...
Splices and taps of conductors have been in the National Electrical Code for a long time. The 2020 NEC contains major changes involving distribution blocks, splices and taps, and to understand the reasons for these changes...
With the addition of new Section 725.144 and the accompanying Table 725.144 in the 2017 NEC covering transmission of power and data to a powered device comes the requirement for a special marking of the cable used for these...
A very knowledgeable electrical contractor in the Phoenix area recently emailed me, stating he was having a National Electrical Code (NEC) discussion with a local electrical inspector. The discussion involved the sizing of...
I have always been fascinated by cables and conductors—sometimes referred to as wires in the National Electrical Code (NEC) and other standards—and the insulation for these cables and conductors, as well as their multiple...
If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering why or if such a requirement exists, ask Charlie, and he will let the Code...
Parallel conductors are often installed where large ampacity feeders or services are used. Total understanding of the paralleling requirements permitted in the National Electrical Code is necessary before attempting to design...
