Chapter A General rules of electrical installation design

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F18 © Schneider Electric - all rights reserved F - Protection against electric shock 4 Protection of goods in case of insulation fault Positioning GFP devices in the installation Type / installation level Main-distribution Sub-distribution Comments Source Ground Return (SGR) v Used Residual Sensing (RS) (SGR) v b Often used Zero Sequence (SGR) v Possible v b Rarely used b Recommended or required Schneider Electric - Electrical installation guide 2008
F - Protection against electric shock A RCD Fig. F29 : Distribution circuits RCD B RCD RA1 RA2 Distant location 5 Implementation of the TT system 5.1 Protective measures Protection against indirect contact General case Protection against indirect contact is assured by RCDs, the sensitivity IΔn of which 50 V complies with the condition I �n i (1) (1) RA The choice of sensitivity of the residual current device is a function of the resistance RA of the earth electrode for the installation, and is given in Figure F28. Schneider Electric - Electrical installation guide 2008 IΔn Maximum resistance of the earth electrode (50 V) (25 V) 3 A 16 Ω 8 Ω 1 A 50 Ω 25 Ω 500 mA 100 Ω 50 Ω 300 mA 166 Ω 83 Ω 30 mA 1666 Ω 833 Ω Fig. F28 : The upper limit of resistance for an installation earthing electrode which must not be exceeded, for given sensitivity levels of RCDs at U L voltage limits of 50 V and 25 V Case of distribution circuits (see Fig. F29) IEC 60364-4-41 and a number of national standards recognize a maximum tripping time of 1 second in installation distribution circuits (as opposed to final circuits). This allows a degree of selective discrimination to be achieved: b At level A: RCD time-delayed, e.g. “S” type b At level B: RCD instantaneous Case where the exposed conductive parts of an appliance, or group of appliances, are connected to a separate earth electrode (see Fig. F30) Protection against indirect contact by a RCD at the circuit-breaker level protecting each group or separately-earthed individual appliance. In each case, the sensitivity must be compatible with the resistance of the earth electrode concerned. High-sensitivity RCDs (see Fig. F31) Fig. F30 : Separate earth electrode Fig. F31 : Circuit supplying socket-outlets (1) 25 V for work-site installations, agricultural establishments, etc. According to IEC 60364-4-41, high sensitivity RCDs (y 30 mA) must be used for protection of socket outlets with rated current y 20 A in all locations. The use of such RCDs is also recommended in the following cases: b Socket-outlet circuits in wet locations at all current ratings b Socket-outlet circuits in temporary installations b Circuits supplying laundry rooms and swimming pools b Supply circuits to work-sites, caravans, pleasure boats, and travelling fairs See 2.2 and chapter P, section 3 F19 © Schneider Electric - all rights reserved
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General rules of electrical install
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2 3 4 5 Chapter Q EMC guidelines Co
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Chapter A General rules of electrical installation design

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