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Further electrical dimensional parameters for "Panel boards"

Monday, 1 September 2014 PDF icon Further electrical dimensional parameters for Ex Panel Board
In this fourth and final part, we’ll explain the other parameters for the electrical sizing of Panel boards addressed to systems with the presence of danger of explosion, such as: choice of sectioning and interruption devices; the filiation / coordination; the tripping curves; the differential protection unbalance current (earth leakage); the dissipated power; the preheating. The correct choice of sectioning and interruption devices is the first that the designer must perform properly because it affects the electrical sizing, both the main circuit breaker and the departures.

EWL series LED lighting fixtures and floodlights exempt from photobiological risk

Monday, 1 September 2014 PDF icon EWL series exempt from photobiological risk
Cortem Group, always committed to technological innovation and safety of people and environment, submitted the EWL series LED lighting fixtures and floodlights to the test for the photobiological risk, as provided by IEC 62471, EN 62471 and CEI EN 62471 standards currently in force, and by the Legislative Decree N° 81 of April, 9th 2008 which introduced the risk assessment. These standards, as well as providing guidance for the photobiological safety evaluation, define the exposure limits (EL), the measurement techniques and the classification scheme for the evaluation and control of photobiological risks. The IEC 62471 standard contains several construction requirements related to the ANSI/IESNA RP-27.2 standard which is valid in North America. From the test reports, resulted that EWL series, both in the version without optics, with standard beam of 120°, and in the versions with optics concentrating the light beam, are fully compliant with the requirements of the "Exempt Group”.

The dimensioning of electrical conductors - Part three

Tuesday, 1 July 2014 PDF icon The dimensioning of electrical conductors for use in panel boards Part three
In this third part, we want to speak about how important is the correct sizing of the electrical conductors to be used as "wiring" inside the distribution panels which will be installed in explosion proof areas. So as the electrical conductors are properly sized, you need to analyze also the sizes and the characteristics of the organs responsible for their protection, as well as the protection of the underlying loads. Beyond the capacity of current conductors and the operating temperature, it’s essential that they are also sized according to pass-through specific energy, in order to avoid that the overheating, generated during the working or during the event of overcurrent due to a malfunction caused by short circuits, may be the cause of the increasing of enclosure’ surface temperature and, consequently, the automatic triggering of explosion of the outer atmosphere which, at that time, may be saturated with gas.

The marking of REV, REVD series cable glands using adhesive transparent labels

Tuesday, 1 July 2014
During the design of the new range of REV and REVD series cable glands in different materials (nickel plated brass, galvanized steel and stainless steel), we wanted to introduce a type of standard marking that would allow us to improve a precise identification of the product by the installer: the type of raw material used for the production, the exact measurement of the component, the type of thread as well as of course the certification data. Our target was improving the quality of marking always keeping in mind the compliance with the applicable regulations. The technical Standard relevant to cable glands (EN 50262) provides the sticker as a possible form of marking. We have chosen it as the most appropriate solution to report clearly and easily readable all the necessary information.

Dimensional criteria for the design of enclosures - Part two

Sunday, 1 June 2014 PDF icon Dimensional criteria for junction boxes - Part two
In this second part, we intend to describe the criteria for the mechanical dimensioning of enclosures addressed to potentially explosive atmospheres. First of all, it’s important to have the sizing parameters that must be provided by customer at the time of size request which are the basis for continuing the technical analysis. These parameters can be summarized as follows: Method of protection; Temperature Class; Ambient temperature; Description of the composition of the Panel Board and the electrical characteristics; Dimensioning of pre heater of the enclosure.

Dimensional criteria for the design of enclosures - Part one

Thursday, 1 May 2014
Many customers advise us the need to have a dimensional criteria for enclosures used as distribution panels, motor starters, control, signaling and marshalling boxes. Since this is a topic that covers many different aspects of dimensional character/construction, with this first part of the topic we intend to highlight the variables inherent to the proper sizing of enclosures suitable for installation in hazardous areas, from the mechanical and electrical point of view.

The new ATEX Directive 2014/34/EU

Tuesday, 1 April 2014 PDF icon The new ATEX directive 2014 34 EU
A great news is going to characterize the law system of the field of equipment that can be used in locations with a potentially explosive atmosphere. On March 29th, 2014, the new ATEX Directive was published in the Official Journal of the European Union. The new Directive of the European Parliament and of the Council dated February 26th, 2014, called ATEX 2014/34/EU, concerns the harmonization of the Member States laws concerning equipment and protective systems intended for use in potentially explosive atmosphers. The objective of Directive 2014/34/EU is to ensure the free movement of goods, to which it applies, in the EU. Accordingly, the Directive, based on the Article 95 of the EC Treaty, provides the requirements and procedures for establishing the harmonized conformities.

Explosion-proof or water-proof electrical equipment?

Saturday, 1 March 2014 PDF icon Explosion proof or water proof electrical equipment
Very often, the explosion-proof equipment is confused with water-proof equipment, even in technical environments. This comes from the incorrect belief that it’s possible to avoid an explosion preventing an explosive atmosphere to get in touch with the ignition source (spark, arc or hot spot). This may be partially true if the hazardous substance is a powder suspended in the air, but it’s a misconception if the explosive atmosphere is represented by a gas. This belief may cause an improper use of an enclosure, incorrectly considered as water-proof, in unsuitable conditions to ensure their safety.

"Ex d IIB + H2" method of protection: a valid alternative to IIC

Saturday, 1 February 2014 PDF icon Ex d IIB + H2 method of protection
Over the years, the technicians settled the concept that, for IIC areas, have to be necessarily used junction boxes with cylindrical flame-path, which usually feature a round-shape body and fixed threaded hubs that make more complicated the construction of electrical panel boards. This bias is not exact. If we read the EN 60079-1 standard, paragraph 5.2.7, we find that the flat flanged flame-paths, typical of IIA and IIB enclosures, are not permitted for IIC Group for volumes larger than 0.5 liters only if the explosive atmosphere is characterized by acetylene. Instead, they are allowed in presence of hydrogen. In recent years, therefore, started the production of explosion-proof junction boxes with protection method “Ex d IIB + H2"...

The grounding during loading / unloading operations of trucks

Wednesday, 1 January 2014 PDF icon The grounding during loading / unloading operations of trucks
What justifies the high cost of grounding clamp that, in the common thought, is nothing more than a simple cable that connects a vehicle to a earth plate? In this article, we will explain its operation and the reason its cost. First of all, it’s necessary to analyze what a grounding clamp is and why it’s essential in an area where loading/unloading operation of materials that can cause an explosive atmosphere, such as gasoline, solvents or flammable dust.

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