Length and Spacing of Ground Rod - RME111 - RWS200 - AWS310-SITE - AWS430 - RWCC - AWS310 - FOC201

Grounding and Lightning Protection in Vaisala Outdoor Installations Technical Reference

Document code
M211786EN
Revision
B
Language
English (United States)
Product
RME111
RWS200
AWS310-SITE
AWS430
RWCC
AWS310
FOC201
Document type
User guide

The optimal ground rod length is 3 m (10 ft).

The minimum horizontal spacing of ground rods is two times the length of the rod: 6 m for a 3-m rod (20 ft for a 10-ft rod).

Closer spacing means wasted performance in grounding resistance because their effective soil volumes overlap, decreasing efficiency.