Electrical Testing And Assessment

October 17, 2019 dbrown

The Project

TechProServ™ have recently undertaken critical assessment and electrical testing on behalf of one of our EMC/EMI customers, working on a specialist electrical system which provides power to advance equipment to test in anechoic test chambers. This entailed variant frequencies (50hz, 60hz and 400hz), AC and DC supplies, and variant voltages (24VDC, 110VAC, 230VAC, 415VAC, 440VAC) from loads at 60A up to 600A.

We were instructed to independently address the design and construction, ensuring design compliance to BS7671 and best practice whilst also, providing assurance to meeting their customers’ requirement. Following this, we delivered scope for electrical testing, providing Electrical Installation Certificates (EICs) and completing their customer Site Acceptance Testing (SATs).

What Are EICs? (Electrical Installation Certificates)

Electrical Installation Certificates (EICs) provide the organisation and/or person responsible for the safety of an electrical installation, with a declaration that the new installation is safe to use at the time it was put into service.

The Electrical Installation Certificate is a safety Certificate that is issued by one of our qualified electricians (qualifying managers) approved by an UKAS accredited body as confirmation that the electrical installation complies with the BS 7671 (IEE Wiring Regulations).

What Is EMI? (Electro Magnetic Interference)

Almost all electrical and electronic equipment is able to create ‘interference’ in one form or another. An example is interference, with emergency radio communication, aircraft navigation systems etc…. This interference is not necessarily just ‘radiated’, it may be transmitted from one product (the cause) to another (the victim) via the mains distribution wiring in a house or office block.
Another kind of interference is caused by the power supply circuits in virtually every electronic product, including lighting systems. These circuits are well known for distorting the mains supply voltage by drawing ‘harmonic’ currents off the mains. These harmonics are at frequencies 50/60Hz supply and can lead to failures in the electrical distribution network.

All the above relates to various forms of ‘emissions’. The sum of all these creates a level of electrical noise in the environment. The energy in radiated emissions may be largely composed of either voltage stress or magnetic field or, (in the case of radio frequencies), both. They are all forms of electromagnetic emissions. The other side is to ensure that products are able to work satisfactorily in the environment in which they are expected to be used. This is a measure of its susceptibility (or immunity) to electromagnetic noise.

What are Anechoic Test Chambers?

Anechoic test chambers are a metal shielded enclosure lined with high performance anechoic (anti-echo) material. This creates an accurate, stable and repeatable testing environment for EMC and RF (wireless) measurements.

Compliant FAC (fully anechoic chamber) also referred to as a FAR (fully anechoic room) is a shielded enclosure with anechoic material located on all walls, ceiling and floor coverage.

The facility has a measuring distance of 3m and is designed for both compliant emission and compliant immunity testing.

The main advantages of a FAC are the anechoic material on the floor creates a free-space condition. This means that fixed height measurements can be used and no anechoic change between emissions and immunity testing. DEF STAN 59-411 test facility has been specifically designed for the varied and heavy-duty testing required by the military

TechProServ™ have undertaken electrical applications and delivered EMC applications for many customers, we have all the relevant accreditations within construction, meeting all the relevant business requirements, and have skilled/certified electrical, mechanical and fabrication engineers with the required tickets.

Call Now Button