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

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

Sample text

Degrees of pollution in the micro-environment For the purpose of evaluating creepage distances and clearances, the following three degrees of pollution in the micro-environment are established. — Pollution degree 1 No pollution or only dry, non-conductive pollution occurs. The pollution has no influence. — Pollution degree 2 Only non-conductive pollution occurs except that occasionally a temporary conductivity caused by condensation is to be expected. — Pollution degree 3 Conductive pollution occurs or dry non-conductive pollution occurs which becomes conductive due to condensation which is to be expected.

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.

Dotted lines show additional connections when gauge body is made from insulating material. The figure shows a typical test apparatus and is not intended to be specific. Figure 13 — Test apparatus and circuit for use with contact and non-contact gauges (see Clause 13) --`,,`-`-`,,`,,`,`,,`--- 45 © BSI 9 October 2003 Copyright British Standards Institution Provided by IHS under license with BSI No reproduction or networking permitted without license from IHS Not for Resale BS 1363-2:1995 --`,,`-`-`,,`,,`,`,,`--- All linear dimensions are in millimetres.

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