The conductors used to connect the surge-protective device to ground shall not be any longer than _____ and shall avoid unnecessary bends.
a) 6 inches
b) 12 inches
c) 18 inches
See answer and applicable Code reference
The correct answer is: d) necessary
The requirements for surge-protective devices (SPDs), 1kV or less, are outlined in Art. 285 of the 2011 NEC. As noted in Sec. 285.12, "The conductors used to connect the S