Electrical Safety

Calculations Central

Voltage Drop Calculations

These voltage drop formulas are based on conductor DC resistance values and are viewed as generally acceptable for voltage drop calculations.


PV Installations for the 2020 NEC

Let’s take a look at some of the more significant changes impacting photovoltaic (PV) installations once the 2020 National Electrical Code (NEC) is validated by the NFPA Standards Council.

PV Systems Math — Sample Calculations

Looking at the PV array in a PV system, many installers and inspectors are confused by new system voltage calculations that may be required by the Code specific to PV...