BS EN IEC 60519-8:2020 pdf free.Safety in installations for electroheating and electromagnetic processing.Particular requirements for electroslag remelting furnaces.
BS EN IEC 60519-8 This circuit shall include an earthing connection preferably at the base plate, which supports the ingot. If the installation enables several melting stations to be supplied from the same power supply, each station shall be provided with an earth connection. For the particular case of a single-head multi-station co-axial electroslag remelting furnace, it is preferable to ground the power circuit at the power supply instead of at the base. In no case shall the operating personnel be exposed to harmful voltages.If the power circuit is multiple-earthed, care shall be taken with the current which flows between the earthing points and through components of the furnace. The circuit of any melting station which is not working shall be isolated from the supply but not from earth.Perforation of the crucible and base plate can cause a fire or an explosion due to the cooling-water flow into liquid metal and slag. The following special measures for design and operation of equipment shall be taken to ensure the protection of personnel and equipment.Sufficient water-cooling to the crucible and base plate shall be ensured in the hot state. For further details, see 10.5. The size of electrode(s) relative to the crucible shall be carefully designed and manufactured in such a way that they remain at a reasonable distance between the crucible and the electrode(s) to avoid the occurrence of arcing. The position of electrode(s) relative to the crucible shall be monitored during melting and aligned. The mechanical properties of graphite electrode(s) and consumable electrode(s) shall be ensured to avoid cracking and a part of electrode dropping into the crucible that can cause arcing during the operation. The electrode(s) with horizontal cracks in the surface or inside is (are) unacceptable. The strength of the welded zone between the consumable electrode and the electrode stub in the operation condition shall be sufficient to avoid it breaking away.BS EN IEC 60519-8 pdf download.