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National standards for terminal blocks
Folded old standard
No. Standard No. Standard name Approval or release date Implementation date
1 GB/T14048.1 Low-voltage switchgear and controlgear General provisions 2000-10-17 1993-01-04 2001-07-01 1993-07-01
2 GB14048.2 Low-voltage circuit breakers 2001-11-21 1994-04-12 2002-11-01 1994-12-01
3 GB14048.3 Switch, disconnector, isolating switch and fuse combination appliances 2002-06-13 1993-09-05 2003-01-01 1994-04-01
4 GB14048.4 Electromechanical contactors and motor starters 2003-09-10 1993-09-05 2004-05-01 1994-04-01
5 GB14048.5 Control circuit appliances and switching elements 2001-11-02 1993-09-05 2002-06-01 1994-04-01
The above five new standards are equivalent to IEC 60947.1~5 of the same name. Considering the actual environmental conditions in China, in GB14048.1-2000 Appendix K added two kinds of humidity resistance requirements and test methods for constant damp heat and alternating damp heat, and required product standards should be selected according to their own characteristics of the corresponding moisture resistance assessment methods.
Collapse the main differences between the old and new standards
The main common differences between the above five old and new national standards are.
a. The new standard removes some of the structural and material performance requirements from the old standard. Such as vibration resistance, impact resistance, impact resistance, ageing resistance of elastic parts, low and (high) temperature resistance, heat resistance, rust resistance, etc.
b. The electromagnetic compatibility of the new standard includes immunity to interference (surge immunity, electrical fast transient/pulse group immunity, radio frequency electromagnetic field radiation immunity and electrostatic discharge immunity) and emission (radiation and conduction). The old standard only has requirements for immunity to electromagnetic interference (immunity to high frequency conducted interference, immunity to high frequency radiated interference, immunity to low frequency conducted interference and immunity to surge overvoltage conducted interference).
c. The differences between the old and new standards for the main circuit of the frequency dielectric test voltage values are shown below.
Differences in the values of the main circuit's frequency dielectric test voltage
Rated insulation voltage Ui
(V) Value of IFT dielectric test voltage
(RMS) (V)
Ui≤60 1000
60<Ui≤300 2000
300<Ui≤690(old standard 660) 2500
690(old standard 660)<Ui≤800 3000
800<Ui≤1000 3500
1000<Ui≤1500 (for DC only) 3500 (old standard 4200)
d. The new standard does not specify the number of test items for the type test, while the old standard provides for at least 2 units for each test.
e. The periodic test in the old standard has been deleted from the new standard.
f. The new standard will be life test (mechanical life and electrical life test) as a special test items, the old standard life test for the type test items.
g. In the new standard, the transport and storage tests in the old standard are deleted.
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