Due to increased inquiries and requests from customers in the electrical industry, it has become advantageous to transition from the current SANS 60439-1 to the new SANS 61439-1&2.
Switchboard Manufacturers KZN have tested their upgraded assembly system at the South African Bureau Of Standards (SABS) NETFA Laboratory in Bronkhorstspruit.
- Resistance to corrosion.
- Thermal stability and resistance to abnormal heat and fire of insulting materials.
- resistance to ultra-violet (UV) radiation.
- resistance to mechanical impact.
- durability of marking.
- lifting and transport.
2) Degree of Protection of Enclosures- 10.3
Validate protection against direct contact with live parts, as well as protection against ingress of solid foreign objects and liquids, in accordance with IEC 60529.
3) Clearances and Creepage Distances – 10.4
Verify that the clearance and creepage distance enable the assembly to withstand the following:
- Exceptional, transient overvoltage (lighting, HV operations),
- Operating voltage and temporary overvoltage.
4) Protection against electrical shock and integrity of protective circuits- 10.5
- The effective continuity between the exposed conductive parts of the assembly and the protective circuit.
- The short-circuit withstand strength of protective circuit.
5) Incorporation of switching devices and components-10.6-
Ensure the compliance of equipment implementation in accordance with the rules of manufacture and EMC regulations, if applicable.
6) Internal electrical circuits and connections- 10.7
Verify the conformity of implementation and dimensioning of internal circuits and connections. The following should be carefully checked:
- Short-circuit withstand strength.
- Temperature-rise withstand.
- The section of the neutral conductor.
- Identification of conductors.
7) Terminals for external conductors-10.8
Verify the compliance of implementation and dimensioning of terminals for external conductors.
8) Dielectric properties-10.9
Test each type of circuit in the assembly to ensure:
- Power-frequency withstand voltage.
- Impulse withstand voltage.
9) Verification of temperature rise -10.10
- Thermal stability of the loaded assembly,
- That the temperatures are controlled on accessible parts, connections and equipment devices.
10) Short -circuit withstand strength-10.11
In comparison to a tested reference design or by testing, verify the level of withstand assigned to the reported short circuit current (unless excluded)
11) Electromagnetic compatibility -10.12
Verify EMC requirements via tests, Except if:
- The incorporated devices and components comply with ECM requirements for the environment that has been specified;
- Their installation and cabling comply with the specifications of the manufacturers.
12) Mechanical operation – 10.13
Verify via tests the mechanical operation of removable parts (including any insertion locking). Enclosures, partitions and fastenings should be able to withstand the wear-and-tear of normal use under short circuit condition.
All of the above test were completed and comply with SANS/IEC 61439-2012/2011 Edition 2- part 1 & 2