2018DL/T 474.5-2018 Guide for insulation test on site Lightning arrester tests
2006DL/T 474.5-2006 Guide for insulation test on site Lightning arrester tests
1992DL 474.5-1992 Insulation Test Implementation Guidelines for Lightning Arrester Tests
DL 474.5-1992 Insulation Test Implementation Guidelines for Lightning Arrester Tests was changed to DL/T 474.5-2006 Guide for insulation test on site Lightning arrester tests .