When running horizontal 1-1/4 in, electrical metallic tubing (EMT) with compression fittings, what is the MAXIMUM permissible distance between condult supports?
Which electrical connection requires the use of a torque device to complete the connection per NEC requirements?
A designer is selecting a charge controller for an off-grid system with a 6 kW PV array and a 48V battery bank. The array Isc is 130A. What is the minimum current rating for the charge controller?
A PV array is located 8 feet from a property line. What is the minimum height above ground for exposed DC conductors per NEC 690.31?
A commercial 600v carport-mounted PV system is installed with rigid running under the parking lot to an inverter pad located at the edge of the parking lot. At what depth below the parking lot base MUST condult be buried?
An installer was asked to provide a means to measure the voltage of each battery in a system. The bank is located 50 ft.
From the data logger. The installer will be using shielded. Twisted pairs of instrumentation wiring, all run in the bundle a conduct.
The signals are connected to isolated and ungrounded inputs at a data logger. Which safely precaution is MOST needed to protect the instrumentation wiring?
A system’s inverter output is 9 kW at 900 W/m² irradiance. What is the expected output at 1000 W/m²?
A PV system is installed on a dwelling with a single-phase 240V service. The inverter output is 7.2 kW. What is the minimum service conductor size per NEC 705.12 if the existing load is 50A?
A ground-mount PV system is planned for a site with a soil bearing capacity of 2000 psf. The array footing design requires a minimum bearing pressure of 1500 psf. What is the safety factor for this installation?
A PV technician is installing a 6.5KWac inverter using a 40A backfed breaker. The single line shows a 200A panelboard with a 200A breaker, but the installer finds that the panelbord actually has a 150A main breaker. Which of the following is the CORRECT installation option?
