Earthing switches of series EK6 are determined for indoor installation and conform to the requirements of GB1985 and IEC 62271-102. They are fitted with snap-action operating mechanisms for positive high-speed closing and sufficiently dimensioned to conduct the rated short-circuit making current when closed under load. The speed of the snap-action closing operation is independent controls. The earthing switches are supplied as kits with a pre-assembled active part and corresponding earthing contacts supplied loose. Correct installation of these parts in a switchgear panel results in a functioning earthing switch. Routine tests toGB1985 and IEC 62271-102 are to be carried out at site accordingly.

2 Ambient Conditions

2.1 normal using ambient conditions

(a) Ambient air temperature: upper limit +40℃

                          Lower limit – 25℃  

Remark: allow to store and transport under – 30℃

(b) Altitude limit: under 1000m

(c) Relative humidity: under 90%

(d) Earthquake intensity: not higher than class Ⅷ

(e) the place should be without fire, explode danger, serious dust, chemical corrosion and strong shock.

2.2 special using ambient conditions

When earthing switch is used in different places of 2.1, users will rise up special requirements to manufacturer.