BS 50340:2010 pdf download – Hydraulic cable cutting devices — Devices to be used on electrical installations with nominal voltage up to AC 30 kV The insulating hose of the insulating hose assembly shall be connected nearby the cutting head. 4.4 Insulating hydraulic fluid The insulating hydraulic fluid shall withstand a test voltage of at least 10 kV. 4.5 Pump 4.5.1 The pump shall be fitted with a safety valve, a reverse flow valve and a pressure gauge to indicate the operating pressure. 4.5.2 To ensure that the pump does not move or tip during pumping, the part of the pump in contact with the ground shall be designed to provide sufficient stability during operation. 4.5.3 The pump shall be suitable for operation by foot or by hand. 4.5.4 Any means provided to adjust the maximum operating pressure shall only be accessible via a cover/plate, or enclosure which needs a special tool for removal. 4.5.5 The pressure level at which the safety valve shall function shall be reached with no more than 100 strokes of the pump operating mechanism. 4.6 Safety valve 4.6.1 The safety valve shall release pressure in excess of the operating pressure by diverting the flow of the insulating fluid back into the storage compartment. 4.6.2 The safety valve shall close automatically when the pressure in the system decreases below the maximum operating pressure. 4.7 Reverse flow valve The reverse flow valve shall be readily operated from the operating position. 4.8 Pressure gauge 4.8.1 The pressure indicated by the pressure gauge shall be clear and unambiguous when viewed from the operating position. 4.8.2 The pressure gauge shall either be protected against mechanical damage or be sufficiently robust in construction. 4.8.3 The range of pressure shown by the pressure gauge shall extend from « No pressure » to a value not less than 1,2 times the maximum operating pressure. The « maximum operating pressure » shall be clearly indicated by a marking in red. The indication shall be clear and unambiguous when viewed from the operating position. 4.9 Hydraulic coupler 4.9.1 The mating parts of the coupler shall be capable of being easily connected by hand on the pump and by a tool on the head. 4.9.2 The mating parts of the coupler, once properly connected, shall neither separate itself under pressure nor leak. 4.9.3 To protect against the ingress of foreign bodies and pollutants, each part of...

Download Address

  • Download