The resistors can be mounted as standalone units or on a mounting base. The mounting area must be resistant to the intended operating temperature, and flame-retardant. Any installation location is possible, optimum cooling conditions are achieved in vertical position with the connecting wires at the lower end. The DEG types are also suitable for operation in high humidity condition. In the standard design, the resistors are mounted on a terminal block so that the resulting type of enclosure is IP20 or, with connection box or connection line, IP54. Cable entry is ensured through cable glands.