TSDR.CO.UK

The new European Standard, EN60335-2-73, replaces the old BS3456 Part 2 and introduces new requirements of construction and, for the first time, stipulates a maximum water temperature for installations using a fixed immersion heater... Clause 19, ABNORMAL OPERATION, requires that the immersion heater is able to withstand an input of 15% over the rated power input and during this test, the water temperature in the cylinder must not exceed 98°c... Clause 22, CONSTRUCTION, requires that any over temperature protection device that is used in compliance with clause 19 must be ‘non-self-resetting'. This simply means that the cut-out must remain open circuit until it is manually reset.

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