What are the IEC electrical concepts in AGL?
ICAO and the FAA say what the pilot must see — IEC says how the electrical equipment behind it is built, installed and tested.
IEC electrical concepts in AGL cover the equipment and installation side of a lighting circuit. Along the chain from supply to fixture, IEC standards apply to the constant current regulator (IEC 61822), the series transformer (IEC 61823), the installation and maintenance of the series circuit (IEC 61820, IEC 61821), and the ingress protection (IP code) of enclosures.
Across the whole system they also set the principles for protection against electric shock, earthing and bonding, and the instruments used to test. IEC standards are voluntary until adopted by a regulator or named in a contract, so always check which document and edition a project calls up.
- Find the part. Which part of the chain is it: supply, CCR, cable loop, transformer or fixture?
- Find the IEC document. Match the part to its standard, such as IEC 61822 for the CCR.
- Check the edition. Quote the current edition and any amendment.
- Check it is called up. An IEC standard binds a project only if a regulation or contract names it.
- Compare with ICAO or FAA. Read the IEC electrical requirement alongside the lighting requirement for the same item.
What the lighting must do for the pilot: pattern, colour, intensity and where each light goes.
How the electrical equipment is built, installed, verified and made safe, from the CCR to the fixture.
Frequently Asked Questions
Q1What does IEC cover in airfield lighting?
The electrical side. IEC standards describe how equipment such as constant current regulators and series transformers is built and tested, and how electrical installations are verified and made safe. ICAO and the FAA say what the lighting must achieve for the pilot, such as pattern, colour and intensity, while IEC says how the electrical equipment behind it is made.
Q2Which IEC standards apply to CCRs and series transformers?
IEC 61822 covers constant current regulators for aerodrome lighting, and IEC 61823 covers the series transformers. Confirm the title and current edition, and check whether your contract or regulator actually calls them up, because other national or FAA documents may be named instead.
Q3What is an IP rating?
The IP code of IEC 60529 describes how well an enclosure keeps out solid objects and water. It is the letters IP followed by two digits, the first for solids and dust and the second for water, with higher numbers meaning more protection. Equipment in pits, bases and pavement needs a rating that suits the water it will see, so use the rating the specification requires.
Q4Is IEC compliance mandatory?
Not on its own. An IEC standard is voluntary until a national regulation, a funding condition or a contract adopts it. National standards bodies, such as BIS in India, may adopt or adapt IEC documents, so check which document and edition your project actually names.
Q5Why does insulation resistance testing matter on a series circuit?
A series circuit is one continuous loop, so a fall in insulation to earth can lead to earth faults and lost lighting. Insulation resistance tests show the condition of the cable and connections. Mains-side verification is covered by IEC 60364-6, series-circuit installation and maintenance testing by IEC 61820 and IEC 61821, and general test instruments by IEC 61557, and testing is done with the circuit isolated, locked out and proved dead, following the site procedure.
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