IEC 60238-2020 pdf download.Edison screw lampholders.
Douilles a vis edison pour lampes.
The male screw thread of an adapter shall be of the same size or larger than the female screw thread shell of the adapter.
13.2 There shall be adequate space for the supply wires In the dome of the lampholder. Parts of the lampholder with which insulated conductors may come into contact shall have no sharp edges or a shape likely to damage the insulation.
Threaded entry lampholders shall be provided with means to prevent the conduit entering too far into the entry, unless it is evident from the design that the conduit is unlikely to enter too far into the entry, for example in certain candle lampholders.
Compliance is checked by inspection and by fitting flexible cables or cords of the largest cross-sectional area according to 11.1 for lampholders E14 and lampholders E27 with MiOxi threaded entries, with conductors with a nominal cross-sectional area one size less than specified for other lampholders E27 and lampholders E40.
For cord-grip lampholders. lampholders E14 and lampholders E27 with MiOxi threaded entries, an ordinary sheathed flexible cord is used; in all other cases, two or three PVC insulated single-core cables are used.
For threaded entry lampholders, the dome of the lampholder is screwed onto a conduit having a length of about 10 cm. The cables are then introduced into the conduit and dome. The ends of the cables, after having been prepared in the usual manner, are connected to the terminals of the lam pholder. If possible, the connection is made with the part carrying the terminals in a position where the shortest distance between the plane of the upper edge of the dome and the nearest part of the terminals is 10 mm. With the terminals held in this position, the cables are tightened and clamped at the free end of the conduit. After this, the lampholder is assembled.
After dismantling, the cables and cords shall not be damaged.
NOTE 1 For lampholders E27 and E40, a test with conductors with maximum cross-sectional area according to 11.1 is under consideration.
NOTE 2 The requirement concerning sharp edges Is not meant for the outer end of the threaded entry. since they are not in contact with the wires when the lempholder is mounted on a conduit,
In case of doubt with regard to the means to prevent the conduit entering too far into the entry of a threaded entry lam pholder. the lampholder is screwed onto a steel conduit or mandrel having squared ends (edges left sharp). The conduit or the mandrel is provided with a full thread having the minimum dimensions shown in Figure la or Figure lb.
During this test, the following torque is applied for 1 min:
13.4 In case of lampholders with metal screw shell and metal outer shell, contact between these parts shall be prevented by an insulating ring which shall not be separable from the live parts or the metal outer shell by hand.
Compliance is checked by inspection.
NOTE The protection by the insulating ring is considered sufficient if its length is approximately equal to that of the screw shell.
13.5 It shall be possible to lock the threaded entry on the conduit. Locking devices can either be part of the lampholder or be provided by the design of a luminaire.
Except for angled lampholders. it shall be possible to operate the locking device from the inside, if provided as part of the lampholder.
If a locking device is provided by the design of a luminaire, its efficiency cannot be checked when testing the lampholder; such a check shall be made during testing of the luminaire.
NOTE Such lampholders are not intended for retail sale
This requirement does not apply to lampholders E5 and ElO.
Compliance is checked by inspection and, for lam pholders having an integral locking device, by the test of 16.4.
13.6 Cord-grip lampholders and all lampholders designed for chain connection shall be provided with a device allowing the lampholder to be so fixed to a flexible cord that the conductors are relieved from strain, including twisting, where they are connected to the terminals, and that the outer covering of the cord is gripped in the lampholder and is protected from abrasion. It shall be clear how the relief from strain and the prevention of twisting is intended to be effected.
It shall not be possible to push the cord into the lampholder to such an extent that the cord is subjected to undue mechanical or thermal stress.
Makeshift precautions, such as tying the cord into a knot or tying the end with string, are not permissible.
The device shall be of insulating material or be provided with a fixed insulating lining if otherwise an insulation fault on the cord could make accessible metal parts live.
The design shall be such that the device:IEC 60238-2020 pdf download.Edison screw lampholders