It's not necessary to add something. Just use standard Okken.
But regarding circuit-breakers, apparatus... you have to use spécial devices for tropical atmosphère.
If there is damp, humidity, we suggest to use IP54 cubicle.
Legacy KB System (APS) Data: RESL188506 V2.0, Originally authored by PhBr on 10/17/2007, Last Edited by GwPo on 07/23/2010
Related ranges: Okken