Saturday, November 21, 2009

Friday, November 20, 2009

Testing to DIN EN 60439-1

For a safety function of low-voltage switchgear com binations it is necessary to match the different features of the individual components - the technical details to be considered are described in standard IN EN 60439-1(“Low-voltage switchgear combinations; part 1: Type-tested and partially type-tested assemblies“). The proof of requirements for fulfilling the basic legal principles for low-voltage...

Type-tested (TTA) and Partially type-tested assemblies (PTTA)

Type-tested assemblies (TTA) No.   Requirement to be tested TTA 1 Overtemperature limit Proof of overtemperature limit by testing (type testing) 2 Insulation Proof of insulation by testing 3 Short-circuit resistance Proof of short-circuit resistance by testing (type testing) 4 Effectiveness...

Thursday, November 19, 2009

NEMA Enclosure Types

The purpose of this document is to provide general information on the definitions of NEMA Enclosure Types to architects, engineers, installers, inspectors and other interested parties.  [For more detailed and complete information, NEMA Standards Publication...

IEC 60439-1 / EN 60439-1

Type-tested low-voltage switchgear and controlgear assembly (TTA) A low-voltage switchgear and controlgear assembly conforming to an established type or system without deviations likely to significantly influence the performance, from the typical ASSEMBLY verified to be in accordance with this standard. IEC 60439-1 / EN 60439-1;2.1.1.1. Partially type-tested low-voltage...

Wednesday, November 18, 2009

What is the Electrical Panel?

An electrical enclosure is a cabinet for electrical or electronic equipment to mount switches, knobs and displays and to prevent electrical shock to equipment users and protect the contents from the environment. The enclosure is the only part of the equipment which is seen by users; in many cases it...