industrial plastic ground protection boards whosesaler uae . 2’*4′ ground protection boards application uae-HDPE road . Key Features of MDB – Main Distribution Boards. Fully type tested assemblies as per IEC 61439-1; Rated up to 4000A; Rated operating voltage up to 690V; Manufactured in Form 2, Form 3 & Form 4 nstruction; Type tested for