Design verification is a prerequisite for all assemblies provided. It is fundamental to ensuring every assembly meets its defined design requirements. There is flexibility in the way in which this is achieved within the new standard, and some new concepts have been introduced, but the options are defined and where necessary their use is restricted and a design margin applied....
Tuesday, January 7, 2014
EMC Environment
Assemblies can emit and the must be immune to external electromagnetic disturbances. IEC defines two categories a) Environment A - relates to low-voltage non-public or industrial networks / locations / installations including highly disturbing sources. b) Environment B - relates to low-voltage public networks such as domestic commercial...
Rated diversity factor
In reality all circuits within an assembly will not be called upon to carry their rated current simultaneously and continuously. Diversity is the proportion of their rated current each circuit within a group of outgoing circuits or all outgoing circuits within the assembly can carry, continuously and simultaneously, without the assembly overheating. In ...
ABB circuit breakers inside LV switchboards
DOWNLOAD : http://www05.abb.com/global/scot/scot209.nsf/veritydisplay/40a2505a059a1f0e48257a700024aa1d/$file/1SDC007103G0202.pdf ...
Defined IP ratings for different type of environment
Type of assemblies / Type of environment Standards and sub-clause ...
Heat Dissipation in Electrical Enclosures
The accumulation of heat in an enclosure is potentially damaging to electrical and electronic devices. Overheating can shorten the life expectancy of costly electrical components or lead to catastrophic failure. It is therefore important that system designers are aware of the temperature implications of their designs prior to implementation. Enclosure...
Wednesday, January 1, 2014
What is IP69K?
What is IP69K? The IP69K rating is for applications where high pressure and high temperature washdown is used to sanitize equipment. The IP69K test specification was initially developed for road vehicles, especially those that need regular intensive cleaning (dump trucks, cement mixers, etc), but has been widely adopted in the Food & Beverage industries...
Monday, December 30, 2013
Friday, December 13, 2013
Guide for the Design and Production of LV Power Factor Correction Cubicles
DOWNLOAD : http://www2.schneider-electric.com/documents/panelbuilders/en/shared/application-solutions/LV_PFC_PB_Guide.pdf ...
Dead-front panels
Dead front is defined in Article 100 of the NEC as being “without live parts exposed to a person on the operating side of the equipment.” Section 408.38 requires that panel boards be mounted in cabinets, cutout boxes or enclosures designed for the purpose and shall be dead front. The term “dead front” is used in other places in the NEC, but basically, the NEC requires distribution panels,...
Tuesday, December 10, 2013
Circuit breaker accessories - Service releases
Shunt opening release This allows circuit-breaker opening by means of an electric command. Release operation is guaranteed for a voltage between 70% and 110% of the rated power supply voltage Un, both in AC and in DC. It is always fitted with an auxiliary limit contact. Under voltage release This opens the circuit-breaker due to a power...
Information included in the design verification
The design verification serves to document compliance with the specifications of this standard. It is comprised of 13 individual verifications. For selected individual verifications, additional sub-verifications in subcategories may be required. If selected verifications are not required due to the application, the respective verification should, as a minimum requirement, state...
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