SIST EN 50250:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Konverterski adapterji za industrijsko uporabo (vsebuje popravek AC:2007)Übergangsadapter für industrielle AnwendungAdaptateurs de conversion pour usages industrielsConversion adaptors for industrial use29.120.20Spojni elementiConnecting devicesICS:Ta slovenski standard je istoveten z:EN 50250:2002SIST EN 50250:2004en01-januar-2004SIST EN 50250:2004SLOVENSKI
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SIST EN 50250:2004



EUROPEAN STANDARD
EN 50250 NORME EUROPÉENNE EUROPÄISCHE NORM
December 2002 CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50250:2002 E
ICS 29.120.20 Supersedes EN 50250:1998 Incorporates Corrigendum August 2007
English version
Conversion adaptors for industrial use
Adaptateurs de conversion
pour usages industriels
Übergangsadapter
für industrielle Anwendung
This European Standard was approved by CENELEC on 2002-07-02. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 50250:2004



EN 50250:2002 – 2 –
Foreword
This European Standard was prepared by the CENELEC BTWG 79-1, Conversion adaptors for industrial use.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50250 on 2002-07-02.
This European Standard supersedes EN 50250:1998.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-07-01
- latest date by which the national standards
conflicting with the EN have to be withdrawn (dow) 2005-07-01
Annexes designated "normative" are part of the body of the standard. Annexes designated "informative" are given for information only.
In this standard, Annexes AA and CC are normative and Annex BB is informative.
The contents of the corrigendum of August 2007 have been included in this copy. __________
SIST EN 50250:2004



– 3 – EN 50250:2002 Introduction This standard applies to conversion adaptors, hereinafter referred to as adaptors, for industrial use comprising a housing incorporating a plug and socket-outlets which can be used to connect one or two plugs of the domestic type to an industrial
2P +
16 A, 250 V~, 6 h, type socket-outlet. This standard shall be used jointly with EN 60309-1 "Plugs, socket-outlets and couplers for industrial purposes - Part 1: General requirements", EN 60309-2 "Plugs, socket-outlets and couplers for industrial purposes – Part 2: Dimensional interchangeability requirements for pin and contact-tube accessories" and with the relevant national standards for socket-outlets for household and similar use (listed in Annex AA).
The clauses in this standard amend or replace the clauses of the above mentioned EN 60309-1. SIST EN 50250:2004



EN 50250:2002 – 4 –
1 Scope Replacement: This standard applies to conversion adaptors intended mainly for industrial use, comprising a housing of insulating material which incorporates an industrial
2P + , 16 A, 6 h 250 V~ type plug part (Table 104 in standard EN 60309-2) and one or two socket-outlets in accordance with the relevant national standards for socket-outlets for household and similar use, with a rated current up to 16 A, intended mainly for industrial use either indoors or outdoors. Adaptors can be used in conjunction with socket-outlets and/or connectors This standard applies to all applications where the ambient temperature does not normally exceed 40 °C. The use of these adaptors on building sites, for agricultural, commercial and domestic applications is not precluded but care should be taken in considering protecting devices in use. Adaptors are for temporary use only. In locations where special conditions prevail, for example on board ship or where explosions are liable to occur, additional requirements may be necessary. 2 Normative references This clause of EN 60309-1 is applicable with the following additions: EN 60309-1 1999 Plugs, socket-outlets and couplers for industrial purposes - Part 1: General requirements (IEC 60309-1:1999) EN 60309-2 1999 Plugs, socket-outlets and couplers for industrial purposes - Part 2: Dimensional interchangeability requirements for pin and contact-tube accessories (IEC 60309-2:1999) EN 60529 1991 Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989) HD 21 Series Cables of rated voltages up to and including 450/750 V and having thermoplastic insulation
NOTE
See Annex AA for national standards for domestic socket-outlets. SIST EN 50250:2004



– 5 – EN 50250:2002 3 Definitions This clause of EN 60309-1 is applicable with the following additions: 3.101 adaptor portable accessory which allows the connection of one or more types of plug to a socket-outlet not designed to accept such plugs 3.101.1 single adaptor adaptor having a single plug function and a single socket-outlet function 3.101.2 double adaptor adaptor having a single plug function and two socket-outlet functions. The two socket-outlets may or may not comply with the same dimensional requirements 3.102 rated current of an adaptor - the rated current of the plug part of the adaptor, or - the sum of the rated currents of the plugs that can be inserted into the adaptor, whichever is the lower 3.103 serviceable adaptor an adaptor which can be disassembled, using ordinary tools (e.g. screwdrivers, etc.) for replacement or maintenance 3.104 non-serviceable adaptor an adaptor which cannot be disassembled using ordinary tools (e.g. screwdrivers, etc.) without rendering it permanently useless 4 General This clause of EN 60309-1 is applicable except as follows. 4.1 General requirements Replacement: Adaptors shall be so designed and constructed that in normal use their performance is reliable and without danger to the user or surroundings. In general, compliance is checked by carrying out all the tests specified. SIST EN 50250:2004



EN 50250:2002 – 6 –
4.2 General notes on tests 4.2.1 Replacement: Tests according to this standard are type tests. The parts of adaptors are tested, unless otherwise specified, in accordance with the requirements of the relevant standard, as applicable; e.g. plug part is tested according to EN 60309-2 and socket-outlet parts are tested according to the relevant national standards. 4.2.4 Replacement: Unless otherwise specified, one set of three specimens shall be subjected to all the tests. 4.2.5 Replace the first paragraph of the note by: NOTE
In general, it will only be necessary to repeat the tests which caused the failure, unless the specimens fail in test of Clause 21, in which case tests shall be repeated from Clause 20 onwards. Addition: 4.2.101 If gauges are used, these shall be of hardened steel, and all corners shall be slightly rounded-off with a maximum radius of 0,1 mm and the surface-finish for all measurement-surfaces shall be
N8
min, unless otherwise specified. 5 Standard ratings Replacement: 5.1 Rated voltage: The rated voltage is 250 V ~. 5.2 Rated current: Rated current: 13 A, 15 A and 16 A. NOTE
13 A rated current is allowed only in countries where plugs are fused. 6 Classification Replacement: 6.1 Adaptors are classified: 6.1.1 According to the degree of protection against harmful ingress of water in accordance with EN 60529 - IPX0 (non-protected), - IP ≥ X4 (protected). SIST EN 50250:2004



– 7 – EN 50250:2002 NOTE
The degree of protection of the socket-outlets for industrial use, when used in conjunction with an adaptor, will revert to the protection rating of the adaptor if this is less than that of the socket-outlet. 6.1.2 According to the type of construction - serviceable adaptors, - non-serviceable adaptors. 7 Marking Replacement: 7.1 Adaptors shall be marked with - rated current in amperes, - rated operating voltage or range in volts, - symbol for nature of supply, - either the name or trade mark of the manufacturer or of the responsible vendor, - type reference, which may be a catalogue number, - symbol for degree of protection (IP code), - symbol indicating the position of the earthing contact (plug part side), - wording "FOR TEMPORARY USE ONLY". Adaptors shall be provided with manufacturer instruction stating that - for adaptors having a degree of protection IPX0 the user should be aware that the degree of protection of the industrial socket-outlet in which it will be inserted will be reduced, - adaptors shall not be used in explosive atmosphere. NOTE 1
This wording should be written in the official language of the country of intended use. Compliance is checked by inspection. NOTE 2
Marking 10/16 should be accepted as indication for socket-outlet parts in accordance with standard CEE 7. The symbol indicating the position of the earthing contact shall be placed before or above the figure indicating the rated operating voltage, and separated from it by a line. These markings shall be placed after that for rated current, separated from it by a dash, if an oblique line separates the symbol indicating the position of the earthing contact from the figure for the rated operating voltage. If a symbol for nature of supply is used, it shall be placed next to or below the marking for rated operating voltage. SIST EN 50250:2004



EN 50250:2002 – 8 –
The marking for rated current, position of the earthing contact, rated operating voltage(s) and the nature of the supply may accordingly be as follows: 16 A - 6 h/250 V~, or 16 - 6 h/250~, or 16 - 6h250~ 7.2 When symbols are used, they shall be as follows: A amperes; V volts;
alternating current;
earth; IPXX degree of protection according to EN 60529. For marking of rated current(s) and rated operating voltage(s) or range(s), figures may be used alone. Compliance is checked by inspection. 7.3 The marking specified in 7.1 shall be readily visible when the adaptor is equipped and ready for use, with the exception of the wording "FOR TEMPORARY USE ONLY" which shall also be visible when the adaptor is in use. NOTE 1
The term "ready for use" does not imply that the adaptor is in engagement with its complementary accessory. NOTE 2
The marking for rated current, nature of supply, rated operating voltage and the name, trade mark of the manufacturer or the responsible vendor, may be repeated on the lid, if any. Compliance is checked by inspection. 7.4 In serviceable adaptors the earthing contacts shall be indicated by the symbol . This symbol shall be placed close to the corresponding terminals, and should not be placed on screws, washers or other removable parts. 7.5 Markings shall be indelible and easily legible. Compliance is checked by inspection and by the following test. After the humidity treatment in Clause 18 the marking shall be rubbed vigorously by hand for 15 s with a piece of cloth soaked in water and again for 15 s in a piece of cloth soaked in petroleum spirit. Special attention is paid to the marking of the name, trade mark or identification mark of the manufacturer or the responsible vendor and to that of the nature of supply and to the warning note. NOTE
It is recommended that the petroleum spirit used is of a type consisting of a solvent hexane with an aromatic content of maximum 0,1 volume percentage, a kauri-buthanol value of 29, an initial boiling point of approximately 65 °C, a dry point of approximately 69 °C and a density of approximately 0,68 g/cm3. SIST EN 50250:2004



– 9 – EN 50250:2002 7.6 If, in addition to the marking prescribed, the rated operating voltage is indicated by means of a colour, the colour code shall be blue. An indicating colour, if different from that of the enclosure, shall be used only if it can be easily distinguished. 8 Dimensions This clause of EN 60309-1 is applicable except as follows: 8.1 Replacement: The plug part of adaptors shall comply with standard sheet 2-II of EN 60309-2 insofar as this applies. The socket-outlet part or parts shall comply with the dimensional requirements of the relevant national standards listed in Annex AA. Socket-outlet or plug parts with a variable configuration relating to the coupling (e.g. distance between centres or pin diameter) are not permitted. Plug part Compliance is checked by means of gauges or by measurements for those dimensions not covered by gauges. For plug part of adaptors, the gauges are shown in Figure 107 and Figure 108 of EN 60309-2. Gauges shall be moved axially to the centre line of the plug part with the force indicated below applied for one minute: - force (max.) for the "go" gauge 60 N, - force for the "not go" gauge 2010
− N. Before the test, the test specimen of insulating material shall be stored at a temperature of (20 ± 5) °C and a relative humidity between 45 % and 75 % for 4 weeks. The position of the earthing contact shall be 6 h. Compliance is checked by inspection. Socket-outlet part Compliance is checked by the tests specified in the relevant national standard (listed in Annex AA). 8.2 Replacement: It shall not be possible to engage the plug part of the adaptor with socket-outlets or connectors having different ratings, or having different contact combinations. SIST EN 50250:2004



EN 50250:2002 – 10 –
In addition, the design of the plug part shall be such that improper connections shall not be possible between - the earth contact and a live socket contact, or a live plug contact and the earth socket contact, - the phase plug-contact and the neutral socket contact, if any, - a neutral plug-contact and phase socket contact. Compliance is checked by inspection and tests using the methods indicated below. These tests are made after storage of test specimens of insulating material at a temperature of (20 ± 5) °C and with relative humidity between 45 % and 75 % for 4 weeks. In case of plug parts with a housing of thermoplastic material this test is made at a temperature of (35 ± 2) °C, both the plug parts and the gauges being at this temperature. FIRST TEST (key) The socket gauge shown in Figure 109 of EN 60309-2 is placed before the plug in such a way that during the test the key shall hit the lower part of the shroud of the gauge approximately in the middle. The force F is slowly increased in such a way that the total force given in the following Table 101 is exerted after 15 s. After that the full force is applied for one minute. Table 101 Rated current A Force F N 16 175
While the force is applied the gauge is not permitted to move more than 4 mm in relation to the shroud of the plug part. After the test the plug part shall not be damaged in such a way that impairs the further use of the adaptor. These force is equal to 1,4 times the corresponding withdrawal force. SECOND TEST (earth pin) The force F shall be applied to the earth pin in the same manner and for the same duration as in the previous test. After the test, the plug part shall comply with the relevant standard sheet. For the socket-outlet part compliance is checked by the tests specified in relevant national standard (listed in Annex AA). SIST EN 50250:2004



– 11 – EN 50250:2002 8.3 Addition: Compliance is checked by manual test and, for adaptors with enclosures of resilient or thermoplastic material, by means of the gauge shown in Figure 114 of EN 60309-2. The gauge is applied with a force of 200 N for 1 min. For adaptors with enclosures of thermoplastic material, the gauge is applied at a temperature of (35 ± 2)°C, both the adaptor and the gauge being at this temperature. NOTE
For adaptors of rigid material, such as metal, thermosetting resin, ceramic material and the like, conformity with the relevant standard sheets ensures compliance with this requirement. 9 Protection against electric shock Replacement: 9.1 Adaptors shall be so designed that in normal use, live parts are not accessible, even after removing parts which can be removed without using a tool when adaptors are either in partial or complete engagement with the industrial socket-outlet. Compliance is checked by inspection, and if necessary by means of the following test. The test finger shown in Figure 2 of EN 60309-1 is applied in every possible position when the plug is partly or wholly inserted into the corresponding socket-outlet. In order to check contact with the live parts, an electrical indicator having a voltage of not less than 40 V and not more than 50 V shall be used. The socket-outlet part shall comply with the requirements of the relevant national standard (listed in Annex AA). For equipment in which the use of elastomeric or thermoplastic material may affect the test, it shall be repeated at an ambient temperature of (35 ± 2)°C with the equipment at that temperature. During this additional test the adaptor is subjected for 1 min to a force of 75 N, applied through the tip of a straight unjointed test finger of the same dimensions as the standard test finger shown in Figure 2 of EN 60309-1. This finger with an electrical indicator as described above is applied to all places where yielding of insulating material could impair the safety of the adaptor. During the test the adaptor and its associated fittings shall not deform to such extent that those dimensions shown in the relevant standard sheets which ensure the safety are unduly altered and no live parts shall become accessible. Each specimen of adaptor is then pressed between two flat surfaces with a force of 150 N for 5 min as indicated in Figure 101. The specimen is checked 15 min after removal from the test apparatus, and shall not show such deformation as would result in undue alteration of those dimensions shown in the relevant standard sheets which are intended to ensure safety. SIST EN 50250:2004



EN 50250:2002 – 12 –
For the socket-outlet part, compliance with the corresponding national standard sheets ensures that the requirement is fulfilled with regards to the inaccessibility of the contacts while the plug is being inserted into the complimentary device. 9.2 It shall not be possible to make contact between a pin of a plug and a live contact of a socket-outlet while any other pin is accessible (single pole insertion). Compliance is checked by manual test. For adaptors with enclosures of thermoplastic material, the gauge is applied at a temperature of (35 ± 2)°C, both the adaptor and the gauge being at this temperature. NOTE 1
Single pole insertion may be prevented by the use of at least one of the following means: -
a sufficiently large cover or cover-plate; -
other means (e.g. shutters).
NOTE 2
In some countries the use of shutters as the only means to prevent single pole insertion is not allowed. For the socket-outlet part compliance with the corresponding standard sheets ensures that the requirement is fulfilled. 9.3 The outer parts of adaptors, excluding fixing screws and the like, the live and earth pins, and the earth bars, shall be of insulating material. Compliance is checked by inspection. NOTE
Varnishes, enamels or sprayed insulating coatings are not regarded as insulating materials for the purposes of the specifications mentioned in 9.1 to 9.3 inclusive. For the socket-outlet part compliance is checked by the tests specified in the relevant national standard (listed in Annex AA). 10 Provision for earthing Replacement: 10.1 Adaptors shall be so constructed that when inserting the plug, the earth connection is made before the current-carrying contacts of the plug become live. When withdrawing the plug the current-carrying pins shall separate before the earth connection is broken. Compliance is checked by inspection of the manufacturing drawings, taking into account the effect of tolerances, and by checking the specimens against these drawings. NOTE
Conformity with the relevant national standard sheets ensures compliance with this requirement. SIST EN 50250:2004



– 13 – EN 50250:2002 10.2 The earth terminals of serviceable adaptors shall be in accordance with the appropriate requirements in Clause 11. These shall be of the same size as the corresponding terminals for live conductors. The earth terminals of adaptors shall be internal; in addition to this they shall be fixed to the body or to a part which is securely attached to the body. 10.3 Earthing contacts shall be capable of carrying a current equal to that specified for the phase contacts, without overheating. Compliance is checked by the test of Clause 22. 10.4 Earthing contacts of domestic socket-outlets shall comply with relevant national standards. Compliance is checked as prescribed in the relevant national standards. 11 Terminals Replacement: 11.1 Serviceable adaptors shall be provided with terminals in which connection is made by means of screws, nuts or equally effective devices. Compliance is checked by inspection and by means of the tests specified below as appropriate. 11.2 The connections in non-serviceable adaptors shall be made by soldering, brazing, crimping or similar means; screw or snap-on connections, flat pin or insulation-piercing connections shall not to be used. The use of components with removable terminals is permitted but the connections shall be made by soldering, welding, crimping or by similar means. Compliance is checked by inspection and by means of the tests specified below as appropriate. 11.3 Parts of terminals, other than screws, nuts, washers, stirrups, clamping plates and the like, shall be either of - copper, - an alloy containing at least 58 % copper for parts that are worked cold or at least 50 % copper for other parts, - or other metal not less resistant to corrosion than copper and having mechanical properties no less suitable. Steel screws shall be adequately protected against corrosion. Compliance is checked by inspection and by chemical analysis. SIST EN 50250:2004



EN 50250:2002 – 14 –
11.4 Serviceable adaptors shall be fitted with terminals which ensure that copper conductors having nominal cross-sections from 1 mm2 to 2,5 mm2 are correctly connected. The plug part terminals shall comply with the standard sheets 2-X and/or 2-XI of EN 60309-2. The socket-outlet part terminals shall comply with the relevant national standards. 11.5 Terminals with screw clamping shall allow the conductor to be connected without special preparation. Compliance is checked by inspection. NOTE
The term "special preparation" covers soldering of wires of the conductor, use of cable lug, formation of eyelets etc., but not reshaping of the conductor before its introduction into the terminal or the twisting of a flexible conductor to consolidate the end. 11.6 Terminals with screw clamping shall have adequate mechanical strength. Screws and nuts for clamping the conductors shall have a metric ISO thread or a thread comparable in pitch and mechanical strength. Screws shall not be of metal which is soft or liable to creep, such as zinc or aluminium. Compliance is checked by inspection and by the tests of 11.8 and 11.10. NOTE
For a temporary period, measure SI, BA and UN threads will be considered as being of equivalent pitch and mechanical strength to ISO metric threads. 11.7 Terminals shall be so designed that they clamp the conductor between metal surfaces with sufficient contact pressure and without damage to the conductor. Compliance for the plug part is checked by inspection and the type tests of the terminals of 11.8 and 11.9 of EN 60309-2, applied to three separate terminals. Compliance for the socket-outlet part is checked by inspection and the type tests of the terminals of the relevant national standards. 11.8 Terminals shall be properly fixed to the adaptor and shall not work loose when the clamping screws or nuts are tightened or loosened. Screws and nuts for clamping the conductors shall not serve to fix any other component. NOTE 1
The clamping means for the conductor may be used to stop rotation or displacement of the adaptor contacts. Compliance is checked by inspection and, if necessary, by the test of 25.1. NOTE 2
These requirements do not preclude terminals that are floating or terminals so designed that rotation or displacement of the terminal is prevented by the clamping screw or nut, provided that their movement is appropriately limited and does not impair the correct operation of the adaptor. NOTE 3
Terminals may be prevented from working loose by fixing with two screws, by fixing with one screw in a recess such that there is no appreciable play, or by other suitable means. SIST EN 50250:2004



– 15 – EN 50250:2002 NOTE 4
Covering with sealing compound without other means of locking is not deemed to be sufficient.
Self-hardening resins may, however, be used to lock terminals which are not subjected to torsion in normal use. 11.9 Clamping screws or nuts of earthing terminals shall be adequately locked against accidental loosening, and it shall not be possible to loosen them without the use of a tool. Compliance is checked by inspection and by manual test. 11.10 Earthing terminals with screw clamping shall be such that there is no risk of corrosion resulting from contact between them and the copper of the earthing conductor, or any other metal that is in contact with them. The body of the earthing terminal shall be of brass or other metal no less resistant to corrosion. Compliance is checked by inspection. NOTE
Screws or nuts of plated steel withstanding the corrosion test are considered to be of a metal no less resistant to corrosion than brass. 11.11 Terminals shall be so located or shielded that - screws becoming loose from the terminals can not establish any electrical connection between live parts and metal parts connected to the earthing terminal, - conductors becoming detached from live terminals cannot touch metal parts connected to the earthing terminal, - conductors becoming detached from the earthing terminal cannot touch live parts. Compliance is checked by inspection and by manual test. 11.12 When the conductors have been correctly fitted, there shall be no risk of accidental contact between live parts of different polarity or between such parts and accessible metal parts, and, should a wire of a stranded conductor escape from the terminal, there shall be no risk that wires emerge from the enclosure. Compliance is checked by inspection, and, where the risk of accidental contact between live parts and other metal parts is concerned, by the following test. A 6 mm length of insulation is removed from the end of a flexible conductor having a cross-section area in the middle of the range specified in 11.4. One wire of the stranded conductor is left free and the other wires are fully inserted into and clamped in the terminal. The free wire is bent, without tearing the insulating back, in every possible direction, but without making sharp bends round barriers. The free wire of a conductor connected to a live terminal shall neither touch any metal part which is not a live part nor emerge from the enclosure, and that of a conductor connected to the earthing terminal shall not touch any live part. NOTE
If necessary the test is repeated with the free wire in another position. SIST EN 50250:2004



EN 50250:2002 – 16 –
12 Interlocks Replace the title and clause in EN 60309-1 with the following text: 12 Retaining devices Adaptors shall have a retaining device as specified in Table 109 and standard sheet 2-II of EN 60309-2. 13 Resistance to ageing of rubber and thermoplastic material This clause of EN 60309-1 is applicable, replacing the phrase "plugs and socket-outlets" with the word "adaptors". 14 General construction Replacement: 14.1 The adaptor enclosure shall be constructed of insulating material.
Accessible surfaces shall be free from burrs and sharp edges. Compliance is checked by inspection. 14.2 Screws or other similar means for fixing the part carrying the contacts of serviceable adaptors in a housing shall be easily accessible. Securing means which secure the housing shall not to be used for other purposes, except in the case whereby an internal earthing connection is established automatically and reliably by such securing means. Compliance is checked by inspection. 14.3 It shall not be possible for the user to alter the position of the earthing contact of the plug part of serviceable adaptors in relation to the non-interchangeability means of the corresponding socket-outlet or connector. Compliance is checked by means of a manual test in order to ensure that only one assembly position is possible. 15 Construction of socket-outlets This clause of EN 60309-1 is not applicable. The relevant national standards according to Annex AA apply. SIST EN 50250:2004



– 17 – EN 50250:2002 16 Construction of plugs and connectors Replace the title and the clause in EN 60309-1 with the following text: 16 Construction of adaptors 16.1 The enclosure of serviceable adaptors shall completely enclose the terminals. The plug part of serviceable adaptors shall be so designed th
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