Type F RCDs is a new RCD type recently introduced in IEC 62423 and in IEC60755. In addition to the detection characteristics of type A RCDs, type F RCDs are specially designed for circuit protection where single phase variable speed drives could be used.. Terminology To select and apply residual current devices correctly, requires a basic understanding of the associated Jargon. The term RCD in its self is often incorrectly used – Definitions for some common terms are listed below, refer to Part 2 of BS7671 for a full list associated with the Regulations.
Which type of residual current device (RCD) you should use for
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In what situations do you install a type A RCD?
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the upstream RCD is of selective type (Type S or time-delayed type with appropriate time delay setting), and the ratio between the rated residual operating current (I∆n) of the upstream RCD and the downstream RCD is at least 3:1. Selectivity between upstream and downstream devices is not essential in all cases.. Regardless of RCD type, e.g. AC, A, F or B, an alternating current test shall be used at the rated residual operating current (I Δn), with a maximum operating time not exceeding 300 ms for general non-delay type RCDs. For ‘S’ Type time-delayed RCDs, the operating time shall be between 130 ms (minimum) and 500 ms (maximum).