Thomas Domitrovich, P.E. is a national application engineer with Eaton Corporation in Pittsburgh PA. He has more than 20 years of experience as an electrical engineer and is a LEED Accredited Professional. Thomas is active in various trade organizations on various levels with the Independent Electrical Contractors (IEC), International Association of Electrical Inspectors (IAEI), Institute of Electrical and Electronic Engineers (IEEE), National Electrical Manufacturer’s Association (NEMA) and the National Fire Protection Association (NFPA). Thomas is involved with, and chairs various committees for NEMA and IEEE and is an alternate member on NFPA 73. He is very active in the state-by-state adoption process of NFPA 70 working closely with review committees and other key organizations
The 2020 version of the NEC just took a leap forward for at least one of these two locations with changes to a rule that has been a long-standing requirement for many years – the six (6) disconnect rule found in 230.71.
Zone-selective interlocking (ZSI) has been in practical use since the mid-1980s. This technology was created to speed up the tripping time for some faults within a zone of protection without sacrificing selective coordination and interjecting nuisance tripping into the system.
IAEI is a 90-year-old membership organization with a long and recognized history of comprehensive training in and promotion of safe products, electrical installations, and inspections in order to ensure compliance with electrical codes and standards. The Association is comprised of divisions, chapters, and sections in the United States, as well as other countries. In 2018, the West Virginia Division was redesignated as a chapter.
The challenge is getting people out of flammable clothing and into appropriate PPE through code guidance that’s easier to understand and implement. It starts by putting ourselves in a contractor’s shoes.
The first step to understanding current limitation is to understand what the current waveform looks like during a short-circuit event. To understand the peak current let-through; up and over on the curve.