Perhaps more than any other Code revision cycle in recent memory, there were a significant number of changes to the 2020 National Electrical Code (NEC)® that will have a dramatic effect on the residential construction environment.
The U.S. solar market is accelerating because of a growing understanding that (1) renewable energy projects are sound investments, and (2) uninterrupted power is critical to business success where utility power can fluctuate.
The calculation of general-purpose branch circuits is determined by using a general unit load of 3 volt-amperes per square foot for one- and two-family dwelling units, which is derived from NEC Table 220.12.
Without a supply of energy to replenish the battery, the benefit of an ESS can be limited in a prolonged outage. A combination of solar and storage and energy management of supply and loads are needed to make electricity supply reliable to the homeowner and business owner.
In order to truly understand the implications of the changes to the measuring provisions of Section 210 in the 2020 National Electrical Code (NEC), one must go back and review how we arrived at that point.
A PV system is relatively simple in concept, but after the NEC requirements are added for safety, the execution of the system requires considerable attention to detail. There are also significant numbers of electrical inspectors that are new to the field of inspecting PV systems.
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.