Electric utilities face the challenge of managing aging and unsupported legacy automation and monitoring equipment at their substations and pole-tops. This equipment is critical for accessing data from intelligent electronic devices (IEDs) for measurement and protection, automating key functions and enabling remote users to securely control power-system devices.
During a disruption in electrical service, there are various responsibilities that the utility and homeowner have regarding safe delivery of electricity. This sometimes-contentious issue involves a defined term found in Article 100 of the 2017 National Electric Code (NEC) known as the “service point.” Which begs the question, “How well do you know your electrical service point?”
Ground potential rise is a very important and very dangerous event. The grounding engineer will be required to develop safety systems to protect any personnel working where ground potential rise hazards are known to exist.
Large-scale PV plants have become commonplace in the desert southwest with plants routinely exceeding 100 MW in size. How does that impact the local AHJ and why is Article 691 for large-scale PV electric supply stations even in the NEC?
High voltage visible isolation has been required in Canada since the fifties. Visible isolation is the ability to see the blades of a switch or circuit breaker to determine if the device supplying a high voltage circuit is in the open or closed position.
Today we have daily PV inspections, and some are supply-side connected. Article 705.12(A) Point of Connection (Supply-Side) points the reader to 230.82(6) for the allowance to connect to the supply side of the service disconnecting means.
The subject of jurisdictional demarcation between electrical design of installations required to be performed in accordance with the CE Code, Part I and work by power supply authorities (by electric utilities) is a very big (and very touchy) issue.