26.1 Connections, electrical or mechanical, shall withstand the mechanical stresses occurring in normal use.
Mechanical connections to be used during installation of accessories may be made using thread-forming screws or thread-cutting screws only when the screws are supplied together with the piece in which they are intended to be inserted. In addition, thread-cutting screws intended to be used during installation shall be captive with the relevant part of the accessory.
Screws or nuts which transmit contact pressure shall be in engagement with a metal thread.
Compliance is checked by inspection and, for screws and nuts transmitting contact pressure or which are operated when connecting up the accessory, by the following test.
NOTE 1 The requirements for the verification of terminals are given in clause 12.
注 l︰端子的檢驗要求由第 12 章給出。
The screws or nuts are tightened and loosened
− 10 times for screws in engagement with a thread of insulating material and for screws of insulating material
− five times for all other cases.
Screws or nuts in engagement with a thread of insulating material and screws of insulating material are completely removed and reinserted each time.
The test is made by means of a suitable screwdriver or a suitable tool, applying a torque as specified in table 6.
試驗應使用合適的螺絲起子或其它工具進行以便施加表 6 規定的扭矩。
During the test, no damage impairing the further use of the screwed connections shall occur, such as breakage of screws or damage to the head slots (rendering the use of an appropriate
screwdriver impossible), threads, washers or stirrups.
而無法使用合適的螺絲起子） 、螺紋損壞、墊圈或 U 形卡的損壞等。
NOTE 2 Screws or nuts which are operated when connecting up accessories include screws for fixing covers or cover plates, etc., but not connecting means for screwed conduits and screws for fixing the base of a fixed socketoutlet.
NOTE 3 The shape of the blade of the screw-driver used for the test should match the head of the screw to be tested. The screws and nuts should not be tightened in jerks. Damage to covers is ignored.
NOTE 4 Screwed connections are considered as partially checked by the tests of clauses 21 and 24.
注 4︰螺絲連接視作透過第 21 章和第 24 章的試驗進行部分檢查的連接。
26.2 For screws in engagement with a thread of insulating material which are operated when mounting the accessory during installation, their correct introduction into the screw hole or nut shall be ensured.
Compliance is checked by inspection and by manual test.
NOTE The requirements with regard to correct introduction is met if introduction of the screw in a slanting manner is prevented, for example, by guiding the screw by the part to be fixed, by a recess in the female thread or by the use of a screw with the leading thread removed.
26.3 Electrical connections shall be designed in such a way that contact pressure is not transmitted through insulating material other than ceramic, pure mica or other material with characteristics no less suitable, unless there is sufficient resiliency in the metallic parts to compensate for any
possible shrinkage or yielding of the insulating material.
This requirement does not preclude designs with flat tinsel cord where the contact pressure is obtained from insulating parts having such properties as to ensure reliable and permanent contact under all conditions of normal use, especially in view of shrinking, ageing or cold flow of the insulating part.
Connections made by insulation piercing of tinsel cord shall be reliable.
Compliance is checked by inspection and, for the last requirement, by a test which is under consideration.
NOTE The suitability of the material is considered in relation to the stability of the dimensions.
26.4 Screws and rivets, which serve as electrical as well as mechanical connections, shall be locked against loosening and/or turning.
Compliance is checked by inspection and by manual test.
NOTE 1 Spring washers may provide satisfactory locking.
NOTE 2 For rivets, a non-circular shank or an appropriate notch may be sufficient.
NOTE 3 Sealing compound which softens on heating provides satisfactory locking only for screw connections not subjected
to torsion in normal use.
26.5 Current-carrying parts, including those of terminals (as well as earthing terminals), shall be of metal having, under the conditions occurring in the accessory, mechanical strength, electrical conductivity and resistance to corrosion adequate for their intended use.
載流部件包括端子 (及接地端子) 的載流部件必須由在插接裝置工作時可能發生的條件下
Compliance is checked by inspection and, if necessary, by chemical analysis.
NOTE Examples of suitable metals, when used within the permissible temperature range and under normal conditions of
chemical pollution, are as follows:
− an alloy containing at least 58 % copper for parts made from cold-rolled sheet or at least 50 % copper for other
− stainless steel containing at least 13 % chromium and not more than 0,09 % carbon;
含鉻量至少為 13％、含碳量不大於 0.12％的不鏽鋼；
− steel provided with an electroplated coating of zinc according to ISO 2081, the coating having a thickness of at
符合 ISO 2081 的鍍鋅鋼，但鍍層厚度至少為︰
5 μm, service condition ISO no. 1, for accessories classified IP code IPX0;
5 μm；對於 IP X0 插接裝置在 ISO 1 號工作條件；
12 μm, service condition ISO no. 2, for accessories classified IP code IPX4;
12 μm；對於 IP X4 插接裝置，ISO 2 號工作條件；
25 μm, service condition ISO no. 3, for accessories classified IP code IPX5;
25 μm；對於 IP X5 插接裝置，ISO 3 號工作條件；
− steel provided with an electroplated coating of nickel and chromium according to ISO 1456, the coating having a thickness of at least
符合 ISO 1456 的鍍鎳鉻鋼，但鍍層厚度至少為︰
20 μm, service condition ISO no. 2, for accessories classified IP code IPX0;
20 μm；對於 IP X0 插接裝置，ISO 2 號工作條件；
30 μm, service condition ISO no. 3, for accessories classified IP code IPX4;
30 μm；對於 IP X4 插接裝置，ISO 3 號工作條件；
40 μm, service condition ISO no. 4, for accessories classified IP code IPX5;
40 μm；對於 IP X5 插接裝置，ISO 4 號工作條件；
− steel provided with an electroplated coating of tin according to ISO 2093, the coating having a thickness of at
符合 ISO 2093 的鍍錫鋼，但鍍層厚度至少為︰
12 μm, service condition ISO no. 2, for accessories classified IP code IPX0;
12 μm；對於 IP X0 插接裝置，ISO 2 號工作條件；
20 μm, service condition ISO no. 3, for accessories classified IP code IPX4;
20 μm；對於 IP X4 插接裝置，ISO 3 號工作條件；
30 μm, service condition ISO no. 4, for accessories classified IP code IPX5.
30 μm；對於 IP X5 插接裝置，ISO 4 號工作條件；
Current-carrying parts which may be subjected to mechanical wear shall not be made of steel provided with an electroplated coating.
Under moist conditions, metals showing a great difference of electromechanical potential with respect to each other shall not be used in contact with each other.
Compliance is checked by a test which is under consideration.
NOTE The requirement of this subclause does not apply to screws, nuts, washers, clamping plates and similar parts of terminals.
26.6 Contacts which are subjected to a sliding action in normal use shall be of a metal resistant to corrosion.
Compliance with the requirements of 26.5 and 26.6 is checked by inspection and, in case of doubt, by chemical analysis.
是否符合 26.5 條和 26.6 條的要求要透過觀察檢查；有懷疑時還要透過化學分析來檢查。
26.7 Thread-forming screws and thread-cutting screws shall not be used for the connection of current-carrying parts.
Thread-forming screws and thread-cutting screws may be used to provide earthing continuity, provided that it is not necessary to disturb the connection in normal use and that at least two screws are used for each connection.