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BSI 22/30422039 DC 2022

BSI 22/30422039 DC 2022

$13.70

BS 1363-4. 13 A plugs, socket-outlets, adaptors and connection units – Part 4. 13 A fused connection units switched and unswitched. Specification

Published By Publication Date Number of Pages
BSI 2022 50
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PDF Pages PDF Title
1 30422039.PDF
3 30422039 -.pdf
4 1 Scope
2 Normative references
5 3 Terms and definitions
3.1 accessible external surface of a connection unit
3.2 actuating member
3.3 basic insulation
3.4 cable outlet connection unit
3.5 calibrated link
6 3.6 clamp type (screwless) terminal
3.7 clearance
3.8 connection unit base
3.9 connection unit plate
3.10 creepage distance
3.11 fine wire thermocouple
3.12 flush-mounted connection unit
3.13 functional insulation
3.14 fuse carrier
3.15 fused connection unit
3.16 indicator lamp (pilot lamp)
3.17 insignificant mass
3.18 isolation
7 3.19 live parts
3.20 panel-mounted connection unit
3.21 reinforced insulation
3.22 screw-type terminals
3.23 small parts
3.24 supplementary insulation
3.25 surface-mounted connection unit
3.26 switched connection unit
3.27 terminal
3.28 type test
8 3.29 type test sample
4 Conditions of use
5 General
6 General conditions for type testing
6.1 All tests shall be type tests
9 6.2 All inspections and tests, of any one classification (see Clause 7), shall be carried out as specified in the clauses listed in Table 1 on the number of samples in the sample column and in the order given.
7 Classification and ratings
7.1 Classification
Connection units shall be classified as follows:
7.1.1 According to switching capability:
7.1.2 According to method of mounting:
10 7.1.3 According to provision for outgoing flexible cable:
7.1.4 According to indicator type:
7.1.5 According to the IP rating if declared.
7.1.6 According to the type of terminal:
7.2 Ratings
The rated current of all connection units shall be 13 A.
8 Marking and labelling
8.1 Connection units shall be legibly and durably marked with the following information, which shall not be placed on screws, removable washers or other easily removable parts, or upon parts intended for separate sale:
11 8.1.1 Conformity shall be checked by inspection and by rubbing the markings for approximately 15 s with a cloth soaked in water, and again for approximately 15 s with a cloth soaked in an aliphatic solvent hexane with a content of aromatics of maximum…
8.2 If symbols are used they shall be as follows:
12 9 Clearances, creepage distances and solid insulation
9.1 Clearances
9.1.1 Clearances for basic insulation
9.1.2 Clearances for functional insulation
13 9.1.3 Clearances for supplementary insulation
9.1.4 Clearances for reinforced insulation
9.1.5 Contact gap
9.2 Creepage distances
14 9.2.1 Creepage distances for basic insulation
9.2.2 Creepage distances for functional insulation
9.2.3 Creepage distances for supplementary insulation
9.2.4 Creepage distances for reinforced insulation
9.3 Solid insulation
9.3.1 Conformity shall be checked by tests in accordance with 16.1.3 using the values given in Table 4.
15 9.4 Requirements for printed wiring boards and equivalent construction
10 Accessibility of live parts
10.1 Connection units shall be so designed and constructed that when they are mounted and wired as in normal use, live parts are not accessible even after removal of parts which can be removed without the use of a tool.
10.1.1 Conformity shall be checked by the application of test probe 11 of BS EN 61032:1998 to the accessible external surface of the connection unit applied with a force of N in the most unfavourable position, followed by the application of test prob…
11 Provision for earthing
11.1 All accessible metal parts of connection units shall be in electrical contact with the earthing terminal(s) except that metal parts on, or screws in or through, non-conducting material, and separated by such material from current-carrying parts i…
11.1.1 Conformity shall be checked by inspection and the following:
11.2 If means are provided for electrically bonding the mounting box to the earthing circuit of the connection unit, by means of the fixing screws, the connection between the screw and earthing terminal shall be of low resistance.
11.2.1 Conformity shall be checked by the test described in 11.1.1b) applied between the connection unit earthing terminal(s) and any fixing screw in electrical contact with the earthing circuit. For the purpose of this test the connection unit shall …
16 12 Terminals
12.1 Terminals shall provide for effective clamping and securing of conductors connected to them, so that efficient electrical connection is made.
12.1.1 Conformity for screw-type terminals shall be checked in accordance with 12.2 to 12.8 and screwless terminals shall be checked in accordance with 12.9.
12.2 Connection units shall be provided with line, neutral and earth terminals as defined in 4.12 or 4.13. Separate terminals shall be provided for incoming (supply) and outgoing (load) connections.
12.2.1 Conformity shall be checked by inspection.
12.3 Incoming (or supply) line and neutral terminals shall permit the connection, without special preparation, of one, two or three 2.5 mm2 solid or stranded, or of one or two 4 mm2 stranded conductors as given in Table 4 of BS 6004:2012+A1:2020.
12.3.1 Conformity shall be checked by inspection and by fitting the appropriate conductors.
12.4 Incoming earthing terminals shall permit the connection, without special preparation, of one, two or three 1.5 mm2 or 2.5 mm2 solid or stranded, or of one or two 4 mm2 stranded conductors as given in BS EN 50525-2-11:2011.
12.4.1 Conformity shall be checked by inspection and fitting the appropriate conductors.
12.5 Outgoing (or load) line, neutral and earth terminals shall permit the connection without special preparation of one conductor of solid or stranded cables of 1.5 mm2 or 2.5 mm2 or one conductor of a flexible cable having a nominal cross-sectional …
12.5.1 Conformity shall be checked by inspection and by fitting the appropriate conductors.
12.6 Where pillar terminals are used they shall have clamping screws of sufficient length to extend to the far side of the conductor hole. The end of the screw shall be slightly rounded so as to minimize damage to the conductors. The sizes of the cond…
12.6.1 Conformity shall be checked by inspection and measurement.
17 12.7 Terminal screws shall have a declared outside diameter of not less than 3 mm or be not smaller than 6 B.A.
12.7.1 Conformity shall be checked by inspection and measurement.
12.8 Outgoing (or load) terminals of cable outlet connection units shall be so located or shielded that where a stray strand of a flexible conductor might escape when the conductors are fitted, there is negligible risk of accidental connection between…
12.8.1 Conformity shall be checked by inspection, and by the following test.
12.9 Screwless terminals
12.9.1 Screwless terminals for connection units shall be provided with clamping units which allow the proper connection of conductors as specified in 12.2, 12.3, 12.4 or 12.5 as appropriate.
12.9.2 Screwless terminals shall be such that the conductor is able to be connected without special preparation.
12.9.3 Screwless terminals shall be so designed that they clamp the specified conductors with sufficient contact pressure and without undue damage to the conductor.
12.9.4 It shall be clear how the conductors are to be inserted and disconnected.
18 12.9.5 Screwless terminals which are intended to be used for the interconnection of two or more conductors shall be so designed that:
12.9.6 Screwless terminals shall be so designed that undue insertion of the conductor is prevented and adequate insertion is obvious.
12.9.7 Screwless terminals shall be properly fixed to the connection unit.
12.9.8 Screwless terminals shall withstand the mechanical stresses occurring in normal use. When tested in accordance with the following method, the conductors shall not have moved noticeably in the clamping unit, neither the terminals nor the clampin…
19 12.9.9 Screwless terminals shall withstand the electrical and thermal stresses occurring in normal use. When tested in accordance with the following methods, the screwless terminals shall show no changes likely to impair further use, e.g. cracks, defo…
13 (Not used)
14 Construction of connection units
14.1 Surface-mounted connection units shall be provided with means to ensure proper seating on a flat surface and with fixing holes which will accept screws having a nominal diameter of 3.5 mm, or other suitable fixing means specified in the manufactu…
20 14.1.1 Conformity shall be checked by inspection and measurement.
14.2 Flush-mounted connection unit plates for use with boxes conforming to BS 4662:2006+A1:2009, either of insulating material or metal, or a combination of both, shall be 82.5 mm × 82.5 mm minimum.
14.2.1 Conformity shall be checked by inspection and measurement.
14.3 For flush-mounted connection units, the size of the base or bases shall be such that the clearance for the purpose of wiring between the base or bases and the inside walls of the box or enclosure does not prevent its safe installation in a box or…
14.3.1 Conformity shall be checked by inspection and measurement.
14.4 Conductive component parts of connection units shall be so located and separated that, in normal use, they cannot be displaced so as to affect adversely the safety or proper operation of the connection units.
14.4.1 Conformity shall be checked by inspection and manipulation.
14.5 Provision shall be made for a fuse-link conforming to BS 1362:1973+A3:2021 and it shall be mounted in suitable contacts between the supply line terminal and the corresponding load terminal.
21 14.5.1 Conformity shall be checked by inspection and by the application of test probe B and test probe 13 of BS EN 61032:1998 applied with a maximum force of 5 N, applied in accordance with 10.1.1.
14.6 The actuating mechanism shall be so constructed that when operated, the switch can remain only in a position giving adequate contact or adequate separation of the contacts.
14.6.1 Conformity shall be checked by inspection and by the following test:
14.6.3 Conformity shall be checked by inspection and by the test of 14.6.3.
14.6.4 The necessary force (F) to switch off shall first be measured and the force shall be applied to the extremity of the actuating member.
22 14.7 For connection units incorporating an indicator lamp, the connection of the indicator lamp shall only be made across the line and neutral load terminals. No other connection arrangements shall be permitted.
14.7.1 Conformity shall be checked by inspection.
14.8 Connection units having an IP classification higher than IP20 shall be so constructed so that when they are fixed and wired as in normal use there are no free openings in their enclosures according to their classification.
14.8.1 Conformity shall be checked by inspection and the tests in accordance with 15.3.
14.9 Surface mounted connection units having an IP classification higher than IP20 shall maintain their IP classification when fitted with conduits or with sheathed cables as in normal use.
14.9.1 Conformity shall be checked by inspection, measurement and by the relevant tests of 15.3. For lid springs by inspection and if necessary by the test of 25.2.1.
23 15 Resistance to ageing, resistance to humidity and protection provided by enclosures
15.1 Resistance to ageing
15.1.1 Conformity shall be checked by the following test:
15.2 Resistance to humidity
15.2.1 Conformity shall be checked by the humidity treatment described below followed within 20 min by the measurement of the insulation resistance and by the electric strength test specified in Clause 16.
24 15.3 Protection provided by enclosures
15.3.1 General
15.3.2 Protection against access to hazardous parts and against harmful effects due to ingress of solid foreign objects
15.3.2.1 General
15.3.2.2 Protection against access to hazardous parts
25 15.3.2.3 Protection against harmful effects due to ingress of solid foreign bodies
15.3.3 Protection against harmful effects due to ingress of water
26 16 Insulation resistance and electric strength
16.1 The insulation resistance and electric strength of connection units shall be adequate.
16.1.1 Conformity shall be checked by the tests given in 16.1.2 and 16.1.3.
16.1.2 The insulation resistance is measured using a d.c. voltage of V, the measurement being made for s after application of the voltage. The insulation resistance is measured consecutively between the following:
16.1.3 A 50 Hz voltage of substantially sinusoidal waveform is applied as described in 16.1.2. Initially, not more than 1 000 V is applied, the voltage then being raised to 2 000 V ±60 V for s and is then short-circuited, the output current is not le…
16.2 Switched connection units shall be suitable for isolation.
27 17 Temperature rise
17.1 Connection units and their surroundings shall not attain excessive temperatures in normal use.
17.1.1 Conformity shall be checked by the following test.
29 18 Breaking capacity of connection units
18.1 The breaking capacity of connection unit switches and fuse contacts shall be adequate.
18.1.1 Conformity shall be checked by the tests described in 18.1.2 and 18.1.3 as applicable, which are completed with the connection units connected and mounted as in normal use.
18.1.2 The switch shall make and break a current of 1.25 times rated current ±0.4 A [i.e. (1.25 × 13) A ±0.4 A] in a substantially non-inductive a.c. circuit at 275 V ±5 V, ten times in succession at intervals of approximately 30 s.
18.1.3 The fuse contacts shall make and break a current by insertion and removal of a fuse in a substantially non-inductive a.c. circuit at 275 ±5 V, ten times in succession at intervals of approximately 30 s, the values of the current being 1.25 time…
19 Normal operation of connection units
19.1 Switched connection units shall withstand without excessive wear or other harmful effects, the electrical and mechanical stresses occurring in use.
19.1.1 Conformity shall be checked by the following test.
30 20 Connection of flexible cables and cable anchorage
20.1 For connection units with cable outlets
20.1.1 Conformity shall be checked by inspection and by the following test.
31 20.2 Cable anchorages shall anchor the cable securely to the connection unit, when installed as in normal use. The design shall ensure the following:
20.2.1 Conformity shall be checked by inspection and test.
20.3 Screws which are used when clamping the flexible cable shall not serve to fix any other components unless the connection unit is rendered manifestly incomplete if the component is omitted or is replaced in an incorrect position, or the component …
20.3.1 Conformity shall be checked by inspection.
20.4 The cable entry to a cable outlet connection unit shall be so shaped as to prevent damage to the cable.
20.4.1 Conformity shall be checked by inspection.
21 Mechanical strength
21.1 Connection units shall have adequate mechanical strength and be so constructed as to withstand such handling as might be expected in normal use.
21.1.1 Conformity shall be checked by the tests given in 21.1.2 and 21.1.3.
21.1.2 A solid link of stainless steel as shown in Figure 19 is inserted and withdrawn from the fuse clips 20 times in succession in a normal manner at a rate not exceeding ten per minute. A standard fuse-link conforming to BS 1362:1973+A3:2021 is the…
21.1.3 Connection units are tested with the impact test apparatus shown in Figure 21a). The pendulum consists of a steel tube with an external diameter of 9 mm nominal and a wall thickness of 0.5 mm nominal suspended in such a way that it swings only …
35 22 Screws, current-carrying parts and connections
22.1 Screwed connections, electrical and otherwise, shall withstand the mechanical stresses occurring in normal use. Screws directly transmitting electrical contact pressure shall screw into metal. Screws shall not be of metal which is soft and liable…
22.1.1 Conformity shall be checked by inspection and, for screws and nuts which are intended to be tightened during installation or use, or during replacement of a fuse-link, by the following test.
36 22.2 Thread-cutting and/or thread-forming screws shall not be used for the connection of current-carrying parts.
22.2.1 Conformity shall be checked by inspection and by manual test.
22.3 Current-carrying parts shall be of brass (having a minimum content of 58% copper), copper, phosphor-bronze or other metal at least equivalent with regard to its conductivity, and resistance to corrosion, except for screws, nuts, washers, clamping…
22.3.1 Conformity shall be checked by inspection and by the relevant tests described in 11.1, Clause 17 and Clause 25.
23 Resistance to heat
23.1 Connection units shall be resistant to heat.
23.1.1 Conformity shall be checked as follows.
23.2 Parts of insulating material shall be sufficiently resistant to heat having particular regard to their location and function in the complete connection unit.
23.2.1 Conformity shall be checked as follows:
37 24 Resistance to abnormal heat and fire
24.1 General
24.1.1 Conformity shall be checked by the test described in 24.2.
24.2 Glow-wire test
38 25 Resistance to excessive residual stresses and to rusting
25.1 Press-formed or similar current-carrying parts of copper alloy containing less than 80% of copper shall be resistant to failure in use due to stress corrosion.
25.1.1 Conformity shall be checked by the following test.
25.2 Ferrous parts, the rusting of which might cause the connection unit to become unsafe, shall be adequately protected against rusting.
25.2.1 Conformity shall be checked by the following test.
Annex A Pollution degree
A.1 Degrees of pollution in the micro-environment
39 Pollution degree 1
Pollution degree 2
Pollution degree 3
Annex B (normative) Relation between rated impulse withstand voltage, rated voltage and Overvoltage Category
Annex C (normative) Determination of the Comparative Tracking Index (CTI) and Proof Tracking Index (PTI)
40 Annex D (normative) Impulse voltage test
41 Annex E (normative) Measurement of clearances and creepage distances
46 Annex F (normative) The construction and calibration of a calibrated link
F.1 Construction
48 F.2 Calibration

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