Manual Benning ST 750A (page 46 of 58) (English)

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BENNING ST 750 A

19. Technical Terms

Protective measures

The test procedure is based on the existing protective measure of the test sample for which the

efcacy at therespectiveaccessibleconductive has tobeproven.For the BENNINGST 750A

ApplianceTester,thefollowingclassicationhasbeenmade:

Devices with PE connection (protection class I)

The active parts of the device are protected against direct contact. By connecting the accessible

conductive parts of the housing to the protective conductor, these parts are included in the protec-

tive measures of the system concerning direct contact (fault protection). The fault current is detected

by means of the protective conductor current measurement. The device might also have accessible

conductive parts which are not connected to the protective conductor. The fault current is additional-

ly detected by means of the contact current measurement. The device is provided with a protective

conductor connection (shock-proof plug).

Devices without PE connection (protection class II)

Active parts are isolated by means of reinforced or double insulation (basic insulation and additional

insulation). Thus, the device is protected against direct contact. The device is also protected against

indirect contact, because an insulation fault is all but impossible. However, such devices might be

provided with accessible conductive metal housing parts. Devices of protection class II are equip-

ped with a mains plug without protective conductor.

Devices at safety extra-low voltage circuits (protection class SK III)

Devices of protection class III are connected to safety extra-low voltage circuits (SELV / PELV)

only. Protection against dangerous shock current is ensured by the low voltage and safe isolation

regarding other circuits.

19.1 Technical Terms according to DIN VDE 0701-0702

Repair

Measures taken to restore the nominal condition of the technical means of a system

Modification

Interventioninthedevicewhichisadmissibleaccordingtothemanufacturer'sspecications

Qualified electrician

Aqualiedelectricianissomeonewhoisabletoevaluatethetasksassignedtohim/herduetohis/

her professional education, knowledge and experience as well as to the knowledge of the relevant

provisions and who is able to recognize possible dangers.

Electrotechnically trained person

An electrotechnically trained person is someone who has been informed and instructed (if neces-

sary)bythequaliedelectricianregardingthetasksassignedtohim/herandregardingpossible

dangers in case of improper behaviour. Moreover, the electrotechnically trained person has been

instructed with regard to the required protection equipment and protective measures.

Competent person

In terms of the German Health and Safety at Work Regulation, a competent person is someone

who has the required expert knowledge for the testing of electrical equipment due to his/her vo-

cational education, professional experience and contemporary occupational activity. According to

theGermantechnicalguidelineforoperationalsafety"Competentpersons–specicrequirements

–electricalhazards"(TRBS1203,Part3),thecompetentpersonmust have nished anelectro-

technicalvocationaleducationormusthaveanothersimilarelectrotechnicalqualicationsuitable

for the testing of portable electrical equipment to ensure protection against electrical hazards. The

term professional experience means that the person has at least one year of experience regarding

the installation, assembly or maintenance of electrical equipment and/or systems. For the intended

testing of portable electrical equipment, the competent person must have the required detailed

knowledge of electrical engineering as well as of the relevant electrotechnical regulations and must

regularly update this knowledge. These demands show that safety-related evaluation of portable

electricalequipmentbasicallyrequirestheattributesofaqualiedelectrician.

Test

The test comprises measures for determining and evaluating the actual condition regarding the

safety of the device.

Periodic inspection

A periodic inspection is a test which is carried out in certain time intervals and which is intended for

proving the electrical safety.

Contact current

If someone touches parts of a body of an electrical equipment (device) that are not connected to

theprotectiveconductor,thecontactcurrentisthecurrentowingtoearthviathepersontouching

the device.

Differential current

Vectorialsumofallcurrentowingviatheactiveconductorsattheinput(connection)ofthemains

side

Protective conductor current

SumofthecurrentsowingthroughtheprotectiveconductorofdevicesofprotectionclassI,ifthe

bodies of those devices are insulated to earth

Leakage current

Currentowingtoearthortoanexternalconductivepartviathefaultlessinsulationofadevice

Fault current

Currentowingtoearthortoanexternalconductivepartviathefaultyinsulationofadevice

Alternative leakage current

Currentwhichwouldowthroughtheactiveconductorsofatestsampleandtheprotectiveconduc-

tor or the accessible conductive parts at nominal voltage or at nominal frequency of the test sample.

Note: Please observe the test circuits!

Insulating resistance

Ohmic resistance of the insulation (insulating materials) between conductive parts. Note: Only the

insulating resistance between the active parts and the accessible conductive parts is measured.

Protective conductor resistance

Resistance between a conductive part connected to the protective conductor for protective reasons

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Benning ST 750A Manual

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