‰  NOW 13 WPM  ‰  TEXT IS FROM DECEMBER 2016 QST  PAGE 40  ‰

OR EVEN BURIED LYING SIDE WAYS IN A SUITABLE TRENCH, ALTHOUGH THIS IS A
COMPROMISE INSTALLATION.  SUITABLE RODS ARE GENERALLY 10 FEET LONG AND MADE
FROM STEEL WITH A HEAVY COPPER PLATING.  DO NOT DEPEND ON SHORTER, THINLY
PLATED RODS SOLD BY SOME HOME ELECTRONICS SUPPLIERS, AS THEY CAN QUICKLY
RUST AND SOON BECOME WORTHLESS.  IF MULTIPLE GROUND RODS ARE INSTALLED,
THEY SHOULD BE SPACED BY AT LEAST HALF THE LENGTH OF THE ROD, OR THE
EFFECTIVENESS IS COMPROMISED.  IEEE STD 142, IEEE STD 1100, AND OTHER
ƒ  QST DE W1AW  ‰
REFERENCES HAVE TABLES TO GIVE EFFECTIVE GROUND RESISTANCES FOR VARIOUS
CONFIGURATIONS OF MULTIPLE RODS.  ONCE THE GROUND RODS ARE INSTALLED, THEY
MUST BE CONNECTED WITH EITHER AN EXOTHERMIC WELD SUCH AS CADWELD OR WITH A
LISTED PRESSURE CLAMP.  THE EXOTHERMIC WELD IS PREFERRED, BECAUSE IT DOESNT
REQUIRE ANNUAL INSPECTION LIKE A CLAMP DOES.  SOME INSTALLERS USE BRAZING
TO ATTACH THE WIRING TO THE ROUND RODS.  ALTHOUGH THIS IS NOT PERMITTED FOR
‰  END OF 13 WPM TEXT  ‰  QST DE W1AW  ƒ