Panel Builder System Integrator

February 11, 2021

The conditions inside an electrical panel must be such as to preserve the reliability of the equipment contained within it. The correct thermal analysis and thermal management of a panel is one of the most important actions for guaranteeing performance and reliability over time, as well as for compliance with the relevant regulations.

OVERHEATING AND CONDENSATION

Excessively high temperatures inside a panel are a cause of degradation of the internal components with consequental deterioration of the system’s performance.

Also the presence of humidity is a risk, being a potential cause of short circuits or leakage currents – resulting in safety issues and power cuts to the equipment.

Considering that installed equipment and machinary, their replacement and even their repair, easily represents costs vastly greater than the cost of a temperature control system, provision of the latter can justify itself many times, over time.

THERMAL SIZING OF ELECTRICAL PANELS AND THE NEW EN 61349-1 STANDARD FOR LV SWITCHGEAR AND CONTROLGEAR ASSEMBLIES

To guarantee the correct thermal sizing of an electrical panel, several factors must be considered, mainly:

  • the environmental conditions of installation and therefore the right degree of IP protection
  • the power dissipated by electrical and electronic equipment when operating
  • heat radiated from external or internal sources


The temperature rise within an electrical panel is subject to the requirements of EN 61349-1, which provides limits for average over-temperature values and the maximum values of relative humidity – related to air temperature and altitude above sea level, within which the equipment is to operate.

HOW TO CONTROL THE TEMPERATURE

In the event that the temperature within the panel is not within acceptable limits, solution(s) must be adopted to correct the situation.

One solution is to use industrial thermoregulation products, such as fans or heating elements, controlled by a Thermostat or a panel Thermo-Hygrostat.

THERMOSTAT OR A THERMO-HYGROSTAT – WHICH IS BETTER?

To understand which product best meets your needs, you must first consider if the need is to control just the temperature, or to control humidity and temperature. You then need to consider if this can be achieved by heating management, ventilation activation or humidity measurement and control.

With a thermostat it is possible to manage heating and ventilation within the panel according to the measured temperature.

With a Thermo-Hygrostat we have the additional function of measuring the air humidity, as well as the temperature.
In this way, with a Thermo-Hygrostat working with a heater, it is possible to raise the temperature of the panel and move away from the “dew point”, keeping the humidity level under control and avoiding the risks associated with the formation of condensation.

Finder Thermostats and Thermo-Hygrostats are particularly versatile because of a more compact size (17.5 mm) compared to others on the market, and are available in different versions.

Source

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