STANDARD EN 50321: ELECTRICALLY INSULATING SHOES FOR WORKING ON LOW VOLTAGE INSTALLATIONS
This document is not an official reproduction of the standard; refer to the standards issued by AFNOR www.afnor.fr
The electrically insulating shoes may or may not include a safety toe-cap and consequently meet the requirements of standards EN ISO 20345 or EN ISO 20347
Dielectric shoes are classified for utilisation on or near following voltages installations:
|Electricalclass||Max. nominal AC voltage||Max. nominal DC voltage|
|00||500 V||750 V|
|0||1, 000 V||1, 500 V|
The boot is filled with metal beads up to a distance (h) from the top of the upper.
The boot is immersed in water up to the same distance (h) from the top of the upper.
The high voltage source is connected to the metal beads inside the boot.The water in the tank around the boot is connected to the ground.
|Class||Insulation distance (h)|
Type tests (destructive):
|Class of shoe||AC voltage (Vrms)|
The AC voltage is applied for three minutesThe test is considered to be satisfactory if there is no perforation
Series-production individual tests:
|Class of shoe||Test AC voltage (Vrms)||Test current for the boot (mA rms)|
Each boot must be tested
The AC voltage is applied for one minute
The test is considered to be satisfactory if the current does not exceed the values indicated in the above table and if the test voltage is maintained.