Occupational Health and Safety Act, 1993 (Act No. 85 of 1993)

Code of Practice

National Code of Practice for Electrical Machinery in Hazardous Locations

Regulatory requirements for explosion-protected apparatus

Annexes

Annex F (normative) : Minimum requirements for an Accredited Test Laboratory to be approved

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ANNEX F

(normative)

 

Minimum requirements for an Accredited Test Laboratory to be approved

 

F1. When a test laboratory intends to be accredited to test against a standard then the test signatory is required to have the following:
experience at a test laboratory in the testing of equipment to that standard;
evaluation of results of tests conducted by the signatory of another test laboratory

 

F2 The new test laboratory must have the following equipment and the necessary calibration  certificates:

 

General - 60079-0

Resistance to impact

required

Drop test

required

Degree of protection

required

Measurement for maximum surface temperature

required

Thermal endurance to heat

required

Thermal endurance to cold

required

Surface resistivity

required

Measure of capacitance




Flameproof - 60079-1

Determination of explosion pressure (reference pressure)

required

Overpressure test (static)

required

Overpressure test (dynamic)


Test for non-transmission of internal ignition

required

Tests of ability of enclosure to withstand pressure (breathing and draining devices)


Thermal tests (breathing and draining devices)


Test for non-transmission of internal ignition (breathing and draining devices




Pressurization - 60079-2

Maximum overpressure test

required

Leakage (other than static pressurization)


Static pressurization

required

Purging test for pressurized enclosures (where the protective gas is air)

required

Purging test for pressurized enclosures (where the protective gas is inert)

required

Purging test for pressurized enclosures (where the protective gas may be either air or an inert gas with a density equal to air ± 10%)

required

Filling procedure test for a pressurized enclosure protected by static pressurization

required

Purging and dilution test for pressurized enclosure with an internal source of release

required

Pressurized enclosures where the flammable substance has less than 2% (V/V) oxygen and the protective gas is inert

required

Pressurized enclosures with pressurization by continuous flow, containment system with less than 21% (V/V) oxygen and the protective gas is inert

required

Pressurized enclosure where the flammable substance is not a liquid, pressurization by continuous flow and the protective gas is air

required

Verification of minimum overpressure

required

Overpressure test (infallible containment system)

required

Infallibility test (infallible containment system)

required

Overpressure test for a containment system with limited required release

required

Verifying ability of the pressurized enclosure to limit internal pressure

required



Powder filling - 60079-5

Pressure type test of enclosure (type verification)

required

Flammability of materials


Dielectric strength test of the filling material

required

Maximum temperatures

required

Routine pressure test of enclosure (routine verification)

required

Dielectric strength test of the filling material (routine verification)

required



Increased safety - 60079-7

Dielectric strength

required

Rotating electrical machines


Measuring instruments and instrument transformers


Transformers other than instrument transformers


Secondary batteries


General purpose connection and junction boxes

required

Resistance heating devices and resistance heating units


Terminal insulating material test

required



Intrinsic safety - 60079-11

Spark ignition assessment

required

Temperature test

required

Voltage test

required

Small component ignition test

required

Tests for cells and batteries

required

Mechanical test - casting compound

required

Mechanical test - partitions

required

Test for apparatus containing piezoelectric devices

required

Type test for diode safety barriers and safety shunts


Cable pull test

required

Dielectric strength test

required

Mechanical test - sealing of components before encapsulation

required

Transformer test

required



Type of protection "n" electrical apparatus - 60079-15

Test for enclosed-break devices and non-incendive components

required

Tests for sealed devices and encapsulated devices

required

Tests for restricted-breathing enclosures

required

Mechanical shock test for batteries


Insulation resistance test for batteries


Additional ignition tests for large or high-voltage machines




Protection by encapsulation - 60079-18

Test on the compound - water absorption

required

Test for resettable thermal protective device

required

Conditioning / Thermal cycling

required

Sealing test for build-in protective devices

required