Protection Principle of Low-voltage AC Line - 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
  1. Install a first-stage arrestor (usually a metal oxide varistor) with over 20 kA current capability between the phase and neutral lines and from both lines to a low impedance ground.
  2. Install a series inductor with adequate current rating on the line and on neutral conductors. Several meters of wire can also act as an inductor.
  3. Install second-stage metal oxide varistors (over 3 kA rated) with lower voltage rating at the equipment mains input.

    Check that there are fuses or other overcurrent protectors in front of the first-stage arrestors.