‰ NOW 15 WPM ‰ TEXT IS FROM DECEMBER 2016 QST PAGE 40 ‰ A PRIMARY GROUND, IT IS ACCEPTABLE FOR SECONDARY OR REDUNDANT GROUNDS. SOFT SOLDER TIN LEAD, AS USED IN PLUMBING OR ELECTRICAL WORK SHOULD NEVER BE USED FOR GROUNDING CONDUCTORS BECAUSE IT GETS BRITTLE WITH TEMPERATURE CYCLING AND CAN MELT OUT IF A CURRENT SURGE AS FROM A LIGHTNING STRIKE HEATS THE CONDUCTOR. SOFT SOLDER IS SPECIFICALLY PROHIBITED IN THE CODE. BUILDING COLD WATER SUPPLY SYSTEMS WERE USED AS STATION GROUNDS IN YEARS PAST, BUT THIS IS NO LONGER RECOMMENDED OR EVEN PERMITTED IN SOME JURIS ‰ END OF 15 WPM TEXT ‚