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 any coupler shall be provided with a readily removable cover or cap. NOTE These covers and caps should be made captive to their individual parts of the couplers, so they are not lost.
4.10 Bonding and earthing system The cable cutting device shall be equipped with termination fittings on identified earthing terminals on the cutting head and on the pump where suitable earthing links can be connected.
4.10.1 The pump shall be equipped with termination fittings to allow the connection of earthling cables with a minimum cross section of at least 16 mm 2 .
4.10.2 The cutting head shall be equipped with termination fittings to allow the connection of earthing cables which meet the requirements of EN 61230.
NOTE The earthing terminal shall be placed on the cutting head on such a position that the function of the cutting head will not be effected by possible damages caused by the occurrence of high fault currents.
4.11 Marking
4.11.1 Marking shall be legible and durable.
4.11.2 The following marking shall appear on the cable cutting device.
4.11.2.1 Cutting head
– mark of origin (name or trademark of the manufacturer),
– year of manufacture,
– type,
– number of production or serial number,
– maximum operating pressure,
– maximum cable diameter,
– double triangle symbol (see Figure 2).
4.11.2.2 Insulating hose
The marking specified shall appear along the length of the hose and the interval between the end of a mark and the beginning of the next identical mark shall not be greater than 500 mm.
– mark of origin (name or trademark of the manufacturer),
– year of manufacture,
– type,
– nominal diameter.