KEYWORDS: Light sources and illumination, Photoresistors, Optical sensors, Sensors, Control systems, Photonic integrated circuits, Resistance, Lamps, Power supplies, Analog electronics
Maintaining the lighting parameters in a specific zone at the required level often guarantees the safety of people in this zone. Diverse lighting requirements specified in the PN-EN 12464-2: 2014-05 standard can often be difficult to implement, especially taking into account other recommendations of this standard, for example at energy saving. For this reason, it is very important to carefully choose equipment and lighting system, take into account environment, maintenance program and maintenance characteristics of the lamp. The illuminance of lighting in outdoor work places also depends on daylight, which is affected by the time of the day, season or cloud cover.
This article will present the concept of using a programmable logic controller (PLC) to maintain the illumination at a certain level, regardless of the environmental conditions and time of the day. A control program will be created, the task of which will be to maintain the illuminance at the level required by the standard, thanks to monitoring the conditions in the workplace in real time. This solution will also enable reduction of energy consumption. Furthermore, appropriate control of lighting values on the surrounding area have a great impact on how quickly and comfortably an employee perceives and carries out the visual task.
Equipotential bondings are low-resistance electrical connections of various conductive parts, which aim is to equalize their potentials. In Poland, equipotential bondings are required in each building to which electricity has been supplied. If equipotential bondings have not been carried out, users are exposed to dangerous touch voltage between the simultaneously accessible conductive parts.
This paper will include an analysis of the requirements for protection against electric shock for locations containing a bath or shower, based on the PN-HD 60364-7-701:2010 standard. A computer simulation will be performed to indicate the probable dangerous situations. On its basis, there will be made an attempt to identify solutions that will guarantee the highest effectiveness and reliability of the protection against electric shock. Particular attention will be paid to the protection measures of the additional shock protection in the form of equipotential bondings.
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