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

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

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