| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| DL/T 257-2012 | English | 559 |
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Days<=3
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Installation, operation and maintenance specification of composite insulators for a.c. and d.c. overhead lines with a nominal voltage greater than 1000V
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DL/T 257-2012
| Obsolete |
DL/T 257-2012
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