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Extra info for Woodworking Shopnotes 004 - Shop Built Panel Saw

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For other values of Uo the tabulated earth fault loop impedance values should be multiplied by Uo/230. 413-02 In Appendix 3 of BS 7671, curves have been drawn to represent the slowest cb instantaneous operating times allowed by the standard and median times for fuses. To assist the designer, a set of time/current values for specific operating times has been agreed for each device and is reproduced in a box at the right hand side of each set of curves. Appx 3 Regulations 413-02-09 and 413-02-13 specify maximum disconnection times for circuits.

An RCD used for supplementary protection against direct contact must be of the ‘General’ type (without intentional time delay). In a TN system the time delay of the ‘S’ type RCD must not exceed the requirements of Regulation 413-02. 413-02 Types ‘AC’, ‘A’ and ‘B’ RCDs Type ‘AC’ RCDs will provide protection against AC earth fault currents. Type ‘A’ RCDS will provide protection against AC earth fault currents that contain pulsating DC components. Type ‘B’ RCDs will provide protection against DC earth fault currents.

413 Earthed equipotential bonding and automatic disconnection of supply (EEBADS) Protection against indirect contact which relies upon earthed equipotential bonding and automatic disconnection of the supply is intended to reduce the risk of shock by limiting the disconnection time and voltage magnitude in the event of a fault. Where it is not possible to achieve a sufficiently low earth fault loop impedance to operate an overcurrent device within the required disconnection time an RCD may be used for protection from indirect contact.

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