Blog / Tag
#safety
4 posts filed under this tag, newest first.
Earth resistance testing: the 62 % rule, and when the clamp-on lies
Fall-of-potential done properly, the three-position check that proves it, IS 3043 limits by application, and when a clamp-on tester measures nothing.
8 min read
SPD installation: the two wires that decide
An SPD with 2 m of lead passes more than twice the voltage it should. Lead length, Uc and type selection, and how to check a panel you did not build.
7 min read
RCCB keeps tripping: how to find the leakage
Healthy loads leak. Six of them on one board can trip a 30 mA RCCB with nothing faulty anywhere. How to measure the standing leakage and what to change.
8 min read
Earthing design under IS 3043: electrodes, soil and pits
Soil resistivity, how many earth pits you need, why doubling the rods does not halve the resistance, and the separate-earths myth that destroys equipment.
7 min read