There are many producers of switchgears and most of them produce metal cabinets, since it's less expensive and the producers don't know the technology of the GRP cabinets. I have had 18 years of experience with the prodcution of different sorts of GRP products, including 12 years of experience with GRP switchgears.
I can compete with them since my product is inexpensive, efficient in assebly and in delivery. The construction of the cabinet is very simple and the assembly of 1 sole cabinet takes about 10 minutes.
It would take much longer with metal cabinets because of complicated technological process (cutting sheets of metal, bending shapes, welding, painting, I won't even mention purchasing all the machiner to do so).
My cabinets don't require such a complicated process.