Length of Horizontal Ground Electrode - 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 length of a horizontal ground electrode is typically 10 … 30 m (33 … 100 ft).

In a shallow or rocky soil, three pieces of 10 m (33 ft) horizontal ground electrodes make good low impedance grounding. If the topsoil is moist and of low resistivity, you can use even shorter electrodes, but preferably not shorter than 6 m (20 ft) each.

A buried wire loop with a 5 … 6 m (16 … 20 ft) diameter is suitable for a single mast foundation or when arranged around a set of closely spaced equipment. Arrange at least two connection points on the loop, by making the loop out of two separate wires and leaving the wire ends above the surface.