Not many people are aware that Annex B2 of the standard for dielectric footwear - EN 50321:2018 (Electrically insulating footwear for working on low voltage installations), requires that all approved dielectric footwear is re-tested every year.
Respirex tests every pair of dielectric boots to the methods in the EN 50321 standard during manufacture. Part of this test method, the 'Proof Voltage Test' should be performed annually (or at the interval defined in local national standards if this is different), once the boots are in service, along with a thorough visual inspection of the boots.
A Proof Voltage Test requires that the boot be filled with either water to within 4cm of the top of the boot and that it is submerged in a tank of tap water to the same level. A probe is placed inside the boot and the circuit is completed through an earthed electrode in the water tank. For a routine Class 0 test, a voltage of 5kV is applied for one minute and the current passing through the probe must be less than 5mA for a moulded boot.
This is why our boots have a space to record periodic inspection testing next to the CE markings on the boot. This requirement applies to all CE marked dielectric footwear from every manufacturer - if boots are not re-tested then they are effectively no-longer compliant to the standard.
Respirex have invested in an automated dielectric boot test machine, capable of testing four pair of boots simultaneously, while an additional four pairs are being loaded/unloaded ready for testing. This testing capacity ensures that every single dielectric boot supplied by Respirex is fully tested. It also allows us to offer a re-testing service for our customers.