Ground Electrode Materials - 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

Use corrosion-resistant materials to ensure long, continuous operation:

  • Copper and stainless steel are good.
  • Stainless steel has better corrosion resistance than copper.
  • Copper clad steel is cheaper than copper and commonly available in commercial rods.
  • Hot-galvanized steel (with a minimum coating thickness of 60 µm) is cheap, and good especially in dry soil.
  • Galvanized steel is cheap, but it is not practical in corrosive soil because the service life is short.
  • Stainless or galvanized steel bars that are used in reinforced concrete foundations can be used as ground electrodes, providing they are galvanically connected to each other, preferably by welding.
  • Round solid wires and sheet metal tapes that are 2 … 3 cm (0.8 … 1.2 in) wide are good in dry soil, but in corrosive acid, salty, or wet environment they need frequent maintenance and are short-lived.
Do not use bare steel or aluminum in ground electrodes because of their fast corrosion.

If you use stranded cables, use a strand with a big enough diameter to resist corrosion damage. For standard dimensions, see Table 2.