IEC 62873-3-1-2020 pdf free download – Residual current operated circuit-breakers for household and similar use – Part 3-1: Particular requirements for devices with screwless-type terminals for external copper conductors.
Compliance is checked by inspection and by the tests of 9.2 and 9.3 of this document.
8.5 Insertion and withdrawal of conductors
The insertion and withdrawal of the conductors shall be carried out in accordance with the manufacturer’s instructions.
Compliance is checked by inspection.
8.6 Design and construction of terminals
Terminals shall be so designed and constructed that:
– each conductor is clamped individually;
during the operation of connection or disconnection the conductors can be connected ordisconnected either at the same time or separately;
– inadequate insertion of the conductor is avoided.
lt shall be possible to clamp securely any number of conductors up to the maximum providedfor.
Compliance is checked by inspection and by the tests of 9.2 and 9.3 of this document.
NOTE Examples are given in Figure 2.
8.7Resistance to ageing
The terminals shall be resistant to ageing.Compliance is checked by the test of 9.3.2.
Tests
9.1General
The requirements of Clause 9 of this document apply in addition to Clause 9 of the productstandard, in which this document is referred to.
Test of reliability of screws，current-carrying parts and connections，and the test of reliabilityof screw-type terminals for external copper conductors of Clause 9 of the product standardare replaced here by 9.2 and 9.3.
For short-circuittests，the device shall be connected with cables having the maximumcross-section according to Table 2 of this document.
9.2Test of reliability of screwless-type terminals9.2.1 Reliability of screwless system
The test is carried out on three terminals of poles of new samples, with copper conductors ofthe rated cross-sectional area in accordance with Table 2.The types of conductors shall be inaccordance with Table 1,as applicable.
The connection and subsequent disconnection shall be carried out five times with the smallestdiameter conductor, and then successively five times with the largest diameter conductor.
New conductors shall be used each time，except for the fifth time，when the conductor usedfor the fourth insertion is clamped at the same place.Before insertion into the terminal, wires
of stranded rigid conductors shall be re-shaped and wires of flexible conductors shall betwisted to consolidate the ends.
For each insertion，the conductors shall either be pushed as far as possible into the terminalor shall be inserted so that adequate connection is obvious.
9.2.2Test of reliability of connection
Three terminals of poles of new samples are fitted with new copper conductors of the typeand of the rated cross-sectional area according to Table 2.
The types of conductors shall be in accordance with Table 1, as applicable.
Before insertion into the terminal,wires of stranded rigid conductors and flexible conductorsshall be re-shaped and wires of flexible conductors shall be twisted to consolidate the ends.
lt shall be possible to fit the conductor into the terminal without undue force in the case ofuniversal terminals and with the force necessary by hand in the case of push-wire terminals.
The conductor shall either be pushed as far as possible into the terminal or shall be insertedso that adequate connection is obvious.
After the test, no wire of the conductor shall have escaped outside the terminal.
9.3Tests of reliability of terminals for external conductors
9.3.1 Mechanical strength
For the pull-out test, three terminals of poles of new samples are fitted with new conductors ofthe type and of the minimum and maximum cross-sectional areas according to Table 2.
Before insertion into the terminal，wires of stranded rigid conductors and flexible conductorsshall be re-shaped and wires of flexible conductors shall be twisted to consolidate the ends.
Each conductor is then subjected to a pull force of the value shown in Table 3. The pull isapplied without jerks for 1 min in the direction of the axis of the conductor.IEC 62873-3-1 pdf download.