Strength of material and parts
Resistance to corrosion
Properties of insulating materials
Resistance of insulating materials to normal heat
Resistance to abnormal heat and fire due to internal electric effects
Degree of protection of enclosures
Clearances and creepage distances
Effective continuity between the exposed conductive parts of the assembly and the protective circuit
Effectiveness of the assembly for external faults
Power-frequency withstand voltage
Impulse withstand voltage
Temperature rise limits 1
Short-circuit withstand strength
BS EN 61439 Explained
BS EN 61439 is a standardised set of safety requirements for power switchgear and controlgear assemblies. The purpose of the standard is to;
- harmonise existing general regulations and requirements to achieve uniform requirements and verifications for low-voltage switchgear and controlgear assemblies
- avoid the necessity of verifications in accordance with other standards.
The 2012 edition of BS EN 61439, set out below, is the latest publication and major restructure of the IEC/ BS EN 61439 series; part 2-7 of this series contains the specific requirements for power switchgear and controlgear assemblies.
- 61439-1: General Definitions
- 61439-2: Power Switchgear and Controlgear Assemblies
- 61439-3: Distribution Boards
- 61439-4: Assemblies for Constructions Sites
- 61439-5: Public Cable Distribution Cabinets
- 61439-6: Busbar Trunking Systems
- 61439-7: Draft – specific installations on public sites, marinas, campsites, market squares, and EV charging stations
Our switchgear assemblies meet the requirements set out in BS EN 61439 and have independent certification, guaranteeing safety to the highest standard. We routinely carry out independent testing of our enclosures. It gives us confirmation of what the theoretical limits of our bespoke enclosures are, as well as confirming our enclosures safe and engineered perfectly for their desired use.
How Is Testing Performed?
A reference design
assembly is constructed for testing and contains functional units such as moulded case circuit breakers from chosen manufacturers, interconnections and busbars all assembled to allow future arrangements to be verified to. The reference design is subjected to a series of tests by independent experts – to prove consistency between components and assembly to satisfy the requirements set out in BE EN 61439. Once verified, the certification assures confidence in future PSC assemblies based on this design.
Why It's Important To Your Business
There are many reasons why ensuring an enclosure has been tested to the standards you’re expecting. You’ll want a quality product to match your level of investment – it needs to stand the test of time in service; corrosion resistance for metallic parts is also one of the tests performed. By the nature of their application, Switchgear and controlgear assemblies may be installed for many years; testing to BS EN 61439 ensures the reliability of your enclosure if it's called to react in fault conditions many years after installation.
BS EN 61439 Benefits
- Streamlines design optimisation
- Facilitates bespoke design approval
- Establishes more stringent temperature rise testing
- Eliminates ambiguities
- Ensures safety and quality of low voltage switchgear and controlgear assemblies
Test carried out by A&T Enclosures verified by independent test houses.