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Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

Code of Practice for the Electricity (Wiring) Regulations - 2009 Edition

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material from current carrying parts in such a way that in normal use <strong>the</strong>y<br />

cannot become live, need not be in effective electrical contact with <strong>the</strong><br />

scraping earthing contact.<br />

(9) Marking<br />

(a) The socket outlet should be legibly and durably marked with <strong>the</strong><br />

following in<strong>for</strong>mation, which should not be placed on screws, removable<br />

washers or o<strong>the</strong>r easily removable parts, or upon parts intended <strong>for</strong><br />

separate sale:<br />

(i) rated current;<br />

(ii) rated voltage;<br />

(iii) nature <strong>of</strong> supply.<br />

(b) If symbols are used <strong>the</strong>y should be as follows:<br />

amperes A<br />

volts V<br />

alternating current a.c.<br />

earth or E<br />

splash pro<strong>of</strong> construction<br />

watertight construction<br />

(c) The letters R1, S2, T3 and N should be used to indicate <strong>the</strong> terminals<br />

corresponding respectively to <strong>the</strong> phase socket contacts and <strong>the</strong> neutral<br />

socket contact (N), and a symbol <strong>for</strong> <strong>the</strong> earth contact. The letters and<br />

symbols should be as close as practicable to <strong>the</strong> corresponding terminals.<br />

(10)Temperature rise<br />

(a) The permitted temperature rise <strong>of</strong> <strong>the</strong> accessible external surface <strong>of</strong> <strong>the</strong><br />

socket outlet after <strong>the</strong> test <strong>of</strong> subparagraph (b) should be 50°C.<br />

(b) The following procedures <strong>of</strong> <strong>the</strong> test on <strong>the</strong> temperature rise <strong>of</strong> <strong>the</strong><br />

accessible external surface <strong>of</strong> <strong>the</strong> socket outlet are acceptable:<br />

(i) Temperature rise <strong>of</strong> socket outlets should be measured by fine wire<br />

<strong>the</strong>rmocouples.<br />

(ii) The socket outlets under test should be subjected to its rated loading<br />

connected via a plug. The duration <strong>of</strong> <strong>the</strong> test is 1 hour <strong>for</strong> socket<br />

outlets having a rated current not exceeding 32A; and 2 hours <strong>for</strong><br />

socket outlets having a rated current exceeding 32A.<br />

(c) Socket outlets and plugs should be mounted and connected as in normal<br />

use.<br />

239

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