BS EN 50348-2010 pdf download.Stationary electrostatic application equipment for non-ignitable liquid coating material Safety requirements.
5.2.3 Protection against too high discharge energy
After disconnection of the high voltage all live parts shall be discharged to a discharge energy of less than 350 mJ before these parts can be reached. The discharge time shall be defined considering the operational and local conditions.
5.3 Spraying area
5.3.1 The forced ventilation of the spraying area shall satisfy the requirements of EN 12215:2004.
5.3.2 When using walls, enclosures, signs and labels made of non-conductive material, the occurrence of propagating brush discharges shall be prevented. Thin sheets of plastic material less than 9 mm thick in contact with large areas of grounded metal (or other conductors) can give rise to propagating brush discharges. Where such thin sheets are used, the breakdown voltage through the sheet shall not exceed 4 kV to avoid the occurrence of propagating brush discharges.
NOTE The use of thin layers of non.conducive plashc material on conduchve surfaces may cause hazards due to the formation of propagating brush discharges.
5.3.3 Inside spray booths and in a radius of 2.5 m around the openings of the booths an antistatic floor shall be installed. The resistance shall not exceed 0. Its resistance shall comply with the test conditions of EN 61340-4-1:2004. When using elastic floor the requirements of EN 1081:1998 shall be observed
5.4 High voltage supply
5.4.1 The high voltage supply shall be safeguarded against unauthorized switching on. Switching-off
shall be possible at any time.
NOTE Su6able safeguards against unauthonzed swttcb.ng on are e. g. key locks or hardware and software authonsatsons.
5.4.2 On all doors and openings of the spraying area where the hazard of contact with parts under high voltage exists the presence of the high voltage shall be indicated by an optical or acoustic signal. Every access to the spraying area provided for operators shall be safeguarded in such a way that the high voltage is disconnected when entrance is gained. The interlock shall satisfy the performance level d of EN ISO 13849-1:2008. Other openings of the spraying area through which parts under high voltage could be contacted shall be locked in such a way to be only opened by keys or tools. When using systems of type B-NL an interlock of the high voltage with all doors and openings shall be Installed to prevent an electric shock of persons.
5.4.3 If exposed parts of the high voltage supply system are located outside the spraying area or outside a closed electrical operating area, complete protection against direct contact shall be provided. In addition, appropriate measures (e. g. closed, grounded housing) shall be taken to avoid persons or objects being charged by the influence of a present electrical field.
5.5 Electric requirements
The electric equipment shall comply with the requirements of EN 60204-1:2006.
5.6 Grounding measures
5.6.1 All conductive components of the equipment, like floors, walls, ceilings, fences, conveyors, workpieces, containers for coating material. reciprocators or elements of construction etc. within the spraying area, except for parts under high voltage for operational reasons, shall be connected to the grounding system. Parts of the booth shall be grounded in compliance with EN 122 15:2004.
5.6.2 The resistance to earth from the suspending point of each workpiece shall not exceed 1 Mfl. The voltage during measurement shall be 500 V or 1 000 V. The design of hangers shall ensure that the workpieces remain grounded during the coating process.
NOTE Since workp.eces are often grounded by metallic hooks, it is important to clean the5e hooks frequently or to design them In sud a way that the build-up of .nsulabng layers of coating materia’ is prevented.
5.6.3 If an appropriate grounding of the workpiece according to 5.6.1 cannot be ensured, the dissipation of electrical charges at the wodcpiece by other devices. e. g. ionisers, is permitted. Such devices shall not exceed the permitted discharge energy of the spraying systems, for which they are used. Moreover, these devices shall be submitted to the same test for admissible discharge energy as the spraying system they are used with, The dissipation device shall be interlocked with the spraying system in such a way to disconnect the high voltage and stop coating in case of failure of the dissipation device.
5.7 Supply for coating material
5.7.1 Where conductive parts are used for the coating material supply system, these parts shall be either bonded to earth or connected with the high voltage supply system so that their potential level is invariably Identical with that of the electrostatic spraying system.
5.7.2 Where a coating material container made of conductive material is connected to the high voltage supply system in normal operation, It shall be located In an electrical operating enclosure which is interlocked with the high voltage supply system and is grounded in accordance with the requirements as laid down in 5.2.3.
5.7.3 Where a coating material container made of non-conductive material is used, the coating material shall be in contact with a metallically conductive part so that the electrical charge of the coating material is diverted across this part in accordance with 5.2.3.
5.7.4 Where the requirements as laid down in 5.7.2 and 5.7.3 are not fulfilled, precautionary measures shall be taken In order to prevent any contact with the coating material container or any other exposed parts of the coating material supply under high voltage in normal operation.BS EN 50348-2010 pdf download.