1999 NEC Section 280-12. Routing of Surge Arrester Connections
The conductor used to connect the surge arrester to line or bus and to ground shall not be any longer than necessary and shall avoid unnecessary bends.
Arrester conductors should be as short and be run as straight as practicable, avoiding any sharp bends and turns, which would increase the impedance. High-frequency currents, such as those common to lightning discharges, tend to reduce the effectiveness of a grounding conductor.
Joe Tedesco, NEC Consultant