Glossary

The terminology used in this glossary conforms to the International Vocabulary of Basic and General Terms in Metrology and the International Vocabulary of Legal Metrology. In addition, for CLOU documentation purpose, the following definitions shall apply

Test condition acc. to IEC 62053-21 for protective class II:
a) Apply 4 kV for 1 minute to the meter terminals while all terminals with 40 V or less are pulled to ground.
b) Apply 2 kV for 1 minute between circuits not intended to be connected together in service
No discharging or sparking is allowed.

Categories: Glossary, index, typetest

The European Accreditation Association has per country one member. This members are allowed to approve test laboratories for e.g. calibration according to according to ISO / IEC 17025. The approved test laboratories are so-called Notified Bodies.
The members of the Association will never issue a type-test certificate by themselves, but they guarantee that the certificates issued by their notified bodies are in compliance with the relevant standards.

Example: Type Test Certificate, issued by KEMA, Netherlands
The responsible member of the European Accreditation Association is the Dutch Accreditation Council (RvA). The RvA has issued under the registration no. K006 and K009 the approval for DNV GL Netherlands B.V. to issue calibration certificates.
KEMA is operating under the umbrella of DNV GL Netherlands B.V. For recognition purpose still the old name “KEMA” is in use.
So a KEMA certificate is traceable to the European Accreditation Association.

References:
European Accreditation Association
Dutch Accreditation Council
KEMA / DNV GL

download as pdf SIZE: 124 kB

IEC 60529

Degrees of protection provided by enclosures
(IP Code)

IP stands for Ingress Protection

This standard describes a system for classifying the degrees of protection provided by the enclosures of electrical equipment. The Chinese standard GB 4208 is equivalent. GB 4208-2008外壳防护等级(IP代码)

The IP code consists of the marking IP plus two digits. The first digit stands for dust-protection. The second digit represents the protection against water.

Personal safety:
A protective mask must be worn when operating with open chamber door and during examination.

First digit: Solid particle protection

The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign object.

levelEffective againstDescription
0No protection against contact and ingress of objects
1>50 mmAny large surface of the body, such as the back of a hand, but no protection against deliberate contact with a body part
2>12.5 mmFingers or similar objects
3>2.5 mmTools, thick wires, etc.
4>1 mmMost wires, slender screws, large ants etc.
5Dust protectedIngress of dust is not entirely prevented, but it must not enter in sufficient quantity to interfere with the satisfactory operation of the equipment.
6Dust tightNo ingress of dust; complete protection against contact (dust tight). A suction must be applied. Test duration of up to 8 hours based on air flow.

Second digit: Liquid ingress protection

The second digit indicates the level of protection that the enclosure provides against harmful ingress of water.

levelEffective againstDescription
0NoneNo protection against contact and ingress of objects
1Dripping waterDripping water (vertically falling drops) shall have no harmful effect on the specimen when mounted in an upright position onto a turntable and rotated at 1 RPM. Test duration: 10 minutes, Water equivalent to 1 mm rainfall per minute
2Dripping water when tilted at 15°Vertically dripping water shall have no harmful effect when the enclosure is tilted at an angle of 15° from its normal position. A total of four positions are tested within two axes. Test duration: 2.5 minutes for every direction of tilt (10 minutes total), Water equivalent to 3 mm rainfall per minute
3Spraying water,
Any ingress of water shall be only in a quantity not impairing the operation of the meter
Water falling as a spray at any angle up to 60° from the vertical shall have no harmful effect, utilizing either:
a) an oscillating fixture
Test duration: 10 minutes, Water Volume: 0.07 l/min per hole
b) a spray nozzle with a counterbalanced shield
Test duration: 1 minute per square meter for at least 5 minutes
Water volume: 10 litres per minute, Pressure: 50–150 kPa
4Splashing water,

any ingress of water shall be only in a quantity not impairing the operation of the meter.

Water splashing against the enclosure from any direction shall have no harmful effect, utilizing either:
a) an oscillating fixture, spray ±180° from vertical, water flow 0.07 liter per minute per needle. We have usually 25 needles, so the water flow is 1.75 liter per minute. Duration 10 minutes.b) same as IPX3 spray nozzle with the shield removed
5Water jets,
Water projected by a nozzle (6.3 mm) against enclosure from any direction shall have no harmful effects.
Test duration: 1 minute per square meter for at least 3 minutes

Water volume: 12.5 litres per minute, distance 2.5 m to 3 m.
Pressure: 30 kPa at distance of 3 m

6Powerful water jets,
Water projected in powerful jets (12.5 mm nozzle) against the enclosure from any direction shall have no harmful effects.
Test duration: 1 minute per square meter for at least 3 minutes

Water volume: 100 litres per minute
Pressure: 100 kPa at distance of 3 m

Categories: index, Standards, typetest

IEC 61000-4-2

Electromagnetic compatibility (EMC)
Part 4-2: Testing and measurement techniques
Electrostatic discharge immunity test

Chinese equivalent:
GB/T 17626.2-2006 电磁兼容 试验和测量技术 静电放电抗扰度试验

current output waveform
Current output waveform
LevelContact dischargeAir discharge
1±2 kV±2 kV
2± 4 kV±4 kV
3±6 kV±8 kV
4±8 kV±15 kV
Categories: index, Standards, typetest

Test of the insulation performance of the EUT.
Applicable standard
IEC 62052-11, part 7.3 Insulation

Energy meters have typically protection class II. The rated impulse voltage is 4 kV for meters < 150 V ph-earth or 6 kV for meters with ph-earth voltage between 150 V and 300 V. For each test the impulse voltage is conducted ten times with one polarity and ten times with reversed polarity. The minimum time between the impulses shall be 3 s. Impulse waveform is 1.2/50 μs.

Categories: Glossary, index, typetest

This typetest is also called burden measurement. Applicable standards IEC62053-21, IEC62053-22

The active and apparent power consumption in each circuit of a meter at reference voltage, reference temperature and reference frequency shall not exceed the values shown below.


Cl. 0.2 SCl. 0.5 SCl. 1Cl. 2
Voltage circuits2 W, 10 VA2 W, 10 VA2 W, 10 VA2 W, 10 VA
Current circuits1 VA1 VA4.0 VA2.5 VA
Categories: Glossary, index, typetest

Leave a Reply