Ambient temperature: -40 - +50°C. Permissible voltage variation: +10 - -15%. 3-core cable: The external thread in the screwed cable entry suits flexible steel hose or corresponding cable protection. Terminal box: Leads are connected to terminal screws in the terminal box. The box is fitted with a Pg 13.5 screwed entry for 6-14 mm cable. Max lead cross section: 2.5 mm2.