Introduction

The analysis of threats coming from atmospherical, connecting and induced surges, etc. should not be carried through pure and simple within the area of the closed facility.

Within the multistage surge protection framework, as the first degree of protection, the aerial limiter of the class A (according to VDE 0675) should be provided. Therefore the surge protection analysis should take into account also this degree of protection, all the more, that the surges limiters offer for such applications systematically expands, offering for customer every now and again more new solutions and better parameters. An example of such solutions is introduced surges limiter type ETITEC A, manufactured by ETI Polam along with many versions of clamps (connectors), which are described in the further part of this article.

Application of class A limiters notably improves working conditions of the nn power network and perfectly harmonizes the cooperation of the multi surge protection with further degrees of protection (limiters of the class B , C … etc.). Therefore also the necessity of the usage suchlike protection in the connection with following degrees of protection and also with the surge protection in medium voltage networks.  Read more...