The most important parameter, when choosing electrician’s safety footwear, is the dielectric strength of the sole. Ensure the footwear is rated to one or more of the following standards:-
BS EN50321:2000, BS EN 20345:2004 Amt:2007, ASTM F1117-93 or CZA Z195-02 these may variously certify sufficient dielectric strength for working up to 1000Vac or 1500Vdc, see details below.
1) Testing to
BS EN 50321:2000 - This European Standard covers electrically insulating footwear for the protection of personnel working on or near electrical installations. Boots are tested to ensure that they can withstand 10,000V without puncturing and also to check that current flow does not exceed 5mA when a 5000V potential is applied. They are certified for use up to 1000V AC and 1500V DC (class 0). The red double triangle symbol identifies the boots. The class (0), batch number and date of manufacture are also stated.
2) Testing to
BS EN 20345:2004 Amt:2007 – This European Standard covers various parameters of safety footwear, part of which includes the dielectric strength of the sole for the protection of personnel working on or near electrical installations. The sole must have a dielectric strength >1000M
Ω at 18kV for 1minute in dry conditions and the leakage current must not exceed 0.25mA there after.
3) Testing to ASTM F1117-93 – This American Standard covers electrically insulating footwear for the protection of personnel working on or near electrical installations. The sole leakage current must not exceed 0.8mA at 15kV 60Hz and 2.47mA at 30kV 60Hz.
4) Testing to
CZA Z195-02 – This Canadian Standard covers various parameters of safety footwear, part of which includes the dielectric strength of the sole for the protection of personnel working on or near electrical installations. The sole must have a dielectric strength that, at the point of manufacturing, has electrical insulating properties intended to withstand 18kV, 60Hz with zero leakage current to ground for 1minute in dry conditions and not exceeding 1mA there after. A white rectangle with orange Greek letter omega indicates soles that provide this level of resistance to electric shock.
Note:- It is most important where compliance to muti-part Standards [ 2) and 4)
] are quoted in the footwear specification that you check that this specifically applies to the sole dielectric strength, as this may not be guaranteed.
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