BS EN 50340:2010 pdf download
BS EN 50340:2010 pdf download.Hydraulic cable cutting devices – Devices to be used on electrical installations with nominal voltage up to AC 30 kV.
safety valve
a valve designed and installed to release the pressure of fluid in the pressure compartment when the maximum operating pressure of the hydraulic system is reached, so that it protects the system against overpressure
3.9
hydraulic coupler
a pair of fittings to permit a connection of hydraulic components
NOTE Sen. ooupIes can be separated by hand, Of5 mey reqLare the use ole loot.
3.10
maximum operating pressure
the operating pressure spealied by the manufacturer which shall not be exceeded dunng the functioning of the cable cutting device
3.11
blade(s)
metallic part(s) with a sharp edge or edges which Is desIgned to penetrate the cable In audi a way that the cable will be cut into two separate parts
3.12
earthing system
all those necessary connections, conductors and fittings used to ensure that the electrical potential of an equipment is as close as practicable to the earth potential (i.e. at or about 0 V to earth)
[1EV 604-0402, mod.)
3.13
type test
a test performed of one or more devices made to a certain design to show that the design meets certain
specifications
[1EV 151-04-15)
4 RequIrements
4.1 General
4.1.1 The device shal operate correctly and safely Indoor, outdoor, under rain and with a range of ambient temperature between -20 C to .40 C.
4.1.2 The complete cable cutting device shall safely withstand the maxmum operating pressure.
4.1.3 For cable cutting devices which can be dismantled, suitable means for the storage and transportation of the separate components shall be provided. These means shall be designed to prevent damage to the component parts In transit and pollutlo&contaminalion of all the Insulating parls(i.e. hydraulic fluid, Insulating hose assemblies).
42 Cutting head
42.1 The design of the cutting head shall be such that It can be transported In a safe manner and Is safe and easy to locate on a cable.
4.2.2 The mas5 of the cutting head shall not exceed 20 kg so that it can be safely and readily operated by one person.
4.2.3 The cutting head shall be designed so that when property applied, it shall not be displaced during a cutting operation except when a short circuit fault occurs.
4.2.4 The cutting head shall be capable of accepting all cables up to the maximum diameter indicated by the manufacturer,
42.5 The blade(s) of the cutting head shall be made of a durable metallic matenal with a surface hardness ranging between 558 HVS and 715 HV5 (50 HRC up to 60 HRC) (see EN ISO 6507-1).
4.2.6 The cutting head shall be designed to ensure that cutting is done continuously until the cable is cut through completely,
42.7 lIthe hydraulic pressure disappears for any reason the blade(s) shall return to the starling position.
4.2.8 The cutting head shall be connected to the insulating hose assembly by a coupler which requires the use of a tool to separate it.
4.2.9 The cutting head(s) shall be compatible with the pump as specified by the manufacturer of the pump.
4.3 Insulating hose assembly
According to the operating method and the local regulation, two possibilities can be applicable:
4.3.1 Method A
The insulating hose assembly shall fulfil the following requirements of EN 62237:2005:
– 5.3.1.2 Electric tests on msutating hoses before exposure to huniidity with a test voltage of 36 kV;
– 5.3.1.3 Electric tests on insulating hoses after exposure to humidity” with a test voltage of 36 kV:
– 5.3.1.4 “Electric tests on insulating after the Inflection of a cut on hoses” with a test voltage 0136 kV:
– 5.4.1 “Hydrostatic test:
• 5.4.2 Fatigue test:
– 5.4.3 “Mechanical impulse test with a test piece accordmg to group II (mm. 600 mm) instead test
piece according to group I;
– 5.4.4 Leakage test”:
– 5.4.5 “Change in length test”;
– 5.4.6 “Burst tesr with a test piece according to group II (mm. 600 mm) instead test piece according to group I;
– 5.4.7 “Cold bend test”.
The following additions must be considered:
4.3.1.1 The part of the insulating hose of the hose assembly hoses shall provide the required electric Insulation between the operator and the cable even when the cutting head blade(s) reach(es) the highest nominal voltage at power frequency and also under condition of pollution of the Outer surface.
4.3.1.2 The complete length of the insulating hose of the hose assembly shall be made of insulating material. It shall be flexible.
4.3.1.3 The Insulating hose assembly shall be a single piece and be not less than 10 m long. Moreover, the effective length shall be ire accordance with the recommendations for use as mentioned in Annex A.
