EARTHING DEVICES

Portable earthing device U is used for protecting the workplace of electrical workers working on power line and station equipment furnished with round conductors or flat rails disconnected from power source by connecting the equipment to earth. The company manufactures one-, two-, three-, four- or five-clamp earthing devices.

Portable earthing device U is used for protecting the workplace of electrical workers working on power line and station equipment furnished with round conductors or flat rails disconnected from power source by connecting the equipment to earth. The company manufactures one-, two-, three-, four- or five-clamp earthing devices.

Portable earthing device U is used for protecting the workplace of electrical workers working on power line and station equipment furnished with round conductors or flat rails disconnected from power source by connecting the equipment to earth. Depending on the number of phase clamps the company manufactures one-, two-, three-, four- or five-clamp earthing devices.

Portable earthing device U is used for protecting the workplace of electrical workers working on power line and station equipment furnished with round conductors or flat rails disconnected from power source by connecting the equipment to earth. Depending on the number of phase clamps the company manufactures one-, two-, three-, four- or five-clamp earthing devices, and the available versions are U1, U2, U3, U4 or U5, respectively, wherein the cables may be connected in series or in parallel. For versions U1, U2, U3, the earthing devices are connected both in series and in parallel for all current values and for the time tr=1s, as listed in Table I. For version U4 and U5, the earthing devices connected in parallel are available for the current of up to Ir=9kA and for the time tr=1s. They can be used in the temperature range from -25ºC to + 55ºC for PVC insulated conductors and in the temperature range from -40ºC to +70°C for silicone insulated conductors. Basic version of earthing device is based on WR-2z earth clamp, other clamps are available on request, for example WR-4, WR-3, WR-K25, WR-7, WR-8 and phase clamps: – for round conductors: WT-2, WT-2/A, WT-2/B (diameter up to 29 mm) or WT-3, WT-3/A, WT-3/B (diameter up to 42 mm), – for flat rails WT-P, WT-P/A or WT-2/A, WT-2/B. Clamp WT-2, depending on its version, may be used for round conductors, flat rails or as a universal clamp. The versions differ in the way of fixing. When used with round conductors, the clamp may be used for diameters of conductors to be earthed of up to 29 mm. For flat rails the WT-P clamp is used (fixed at 90 degrees). The WT-2/A and WT-2/B versions can be used both for round conductors and rails. WT-2/B clamp is designed to be snapped in the head of operating rod for installing the earthing device. It is possible to use this combination, if the user has as many rods as the number of earthing device phase clamps. WT-2/A clamp makes it possible to detach the insulating rod so it is possible to install all WT-2/A clamps using one insulating rod.