DANSK DSF/PREN 50176 PDF

1.1 This document specifies the electrical requirements for the design of automatic electrostatic application systems for liquid coating materials which can be ignited in an atomised state, used within a temperature range from 5 °C to 40 °C. This document considers automatic electrostatic application systems for processing ignitable liquid coating materials, where the conductivity of the complete system is limited up to 50 nS/cm. Together with additional measures like e.g. potential separation systems, these requirements can also be applied to ignitable liquid coating materials, where the conductivity of the complete system is limited up to 2 000 μS/cm. Ignition hazards related to the generated explosive atmosphere and the protection of persons against electric shock are considered. 1.2 This document specifies requirements for interfaces to and additional requirements for machinery according to EN 16985:2018, prEN 12621:2020 and prEN 1953:2020. 1.3 This document also specifies requirements for a safe operation of electrostatic application systems, including the electrical installation. The requirements consider both the processing of coating materials and the cleaning and purge processes. 1.4 This document considers three types of spraying systems; see 5.1. Spraying systems are classified as equipment of group II, category 2G or category 3G. Only electrostatic spraying systems operating with a d.c. sinusoidal ripple of not more than 10 % of the r.m.s. value are considered. 1.5 For electrostatic spraying equipment used in food and pharmaceutical industry, additional requirements could apply. 1.6 This document is not applicable to: – liquid electrostatic application equipment for non ignitable liquid coating material, see EN 50348:2010 ; – electrostatic hand-held spraying equipment, see EN 50050 1:2013, EN 50050 2:2013 and EN 50050 3:2013 as well as prEN 50059:2021; – potential separation systems; – cleaning systems for spraying devices; – selection, ...