Download 13 A Plugs, Socket-outlets and Adaptors: Specification for by British Standards Institution PDF

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Extra resources for 13 A Plugs, Socket-outlets and Adaptors: Specification for 13 A Switched and Unswitched Socket-outlets BS 1363

Sample text

The calibration voltage is applied to the resistor when checking the temperature rise of a socket-outlet. 1. 5 If the associated clearance is less than 3 mm, the minimum groove width may be reduced to one third of this clearance. The methods of measuring creepage distances and clearances are indicated in the following Examples 1 to 11. These cases do not differentiate between gaps and grooves or between types of insulation. The following assumptions are made: — any recess is assumed to be bridged with an insulating link having a length equal to the specified width X and being placed in the most unfavourable position (see Example 3); — where the distance across a groove is equal to or larger than the specified width X, the creepage distance is measured along the contours of the groove (see Example 2); — creepage distances and clearances measured between parts which can assume different positions in relation to each other, are measured when these parts are in their most unfavourable position.

After the treatment the sample is washed in running water, any excess mercury wiped off, and the sample is immediately visually examined. There shall be no cracks visible with normal or corrected vision without additional magnification. 2 Ferrous parts, the rusting of which might cause the socket-outlet to become unsafe, shall be adequately protected against rusting. 1 Compliance shall be checked by the following test. 5 min in a 10 % solution of ammonium chloride in water at a temperature of 20 °C ± 5 °C.

4 mm and the diameter such as to allow a small reduction in the cross-sectional area to adjust the watts loss to the required value. 4 mm less twice the end cap end wall thickness t [see Figure 28b)]. The resistive element shoulders shall be firmly butted to the inside faces of the end caps and soldered using a tin silver solder, grade 96S as specified in BS 219:1977. 2. Metal shall then be carefully filed from the resistive element over as long a length as is possible and the assembly rechecked until the desired watts loss is achieved.

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