An installer has decided to use 31 in. long. 3.1/2 in diameter conical ground screws as the footings for a
3.840W solar electric system. Access to he is too difficult to pour concrete footings. The soll is classified as sandy loam. The design wind speed is 90 mph with an uplift force of 32 ibs/ft2. What is the MINIMUM number of screw required to resist uplift loads?

Which of the following voltages should be included on the dc disconnected label to indicate MAXIMUM system voltage?

When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?

A technician has been called to a scale due to a low-performing array. The technician will perform tests in the
24-source circuit combiner box. After putting on the correct PPE and turning off and performing lock.tagout of the inverted and combiner disconnect. Which is the next step to safely begin electrical testing in the combiner box?

According to the NEC, if the PV system disconnect and the building service disconnect are at different locations, there MUST be a/an: