Electrical installation guide: technical solutions Schneider Electric Heads of F, G
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Section F. Protection against electric shock
1. General Information
1.1 Electric shock
1.2 Protection against electric shock
1.3 Direct and indirect contact
2. Protection against direct contact
2.1 Measures of protection against direct contact
2.2 Additional measure of protection against direct contact
3. Protection against indirect contact
3.1 Measures of protection through automatic power-off
3.2 Automatic disconnection for TT system
3.3 Automatic disconnection for TN systems
3.4 Auto power off when the second circuit in the IT system
3.5 Protection against direct and indirect contact without automatic power-off
4. Protection of property damage due to insulation breakdown
4.1 Measures of protection against the danger of fire by using an RCD (RCD)
4.2 fault protection GFP land
5. Implementation of the TT system
5.1 Protective measures
5.2 Types of RCDs
5.3 Coordination of the various protection devices against earth faults
6. Implementation of the TN system
6.1 Prerequisites
6.2 Protection against indirect contact
6.3 RCD with high sensitivity
6.4 Protection of fire-hazardous premises
6.5 When the total on the ground is particularly large circuit resistance circuit
7. The implementation of IT systems
7.1 Prerequisites
7.2 Protection against indirect contact
7.3 RCD with high sensitivity
7.4 Protection of fire-hazardous premises
7.5 Protection at the big full voltage circuit earth fault
8. Residual current devices (RCD)
8.1 Description
8.2 Recommendations on the use of RCDs
Section G. Protection of electrical networks
1. General Provisions
1.1 Methodology and definition
1.2 Principles of protection against overcurrent
1.3 The practical importance for the protection schemes
1.4 Location protective devices
1.5 Parallel wiring
1.6 Example of a given cable calculation
2. Practical method for determining the smallest allowable cross- sectional area network wires
2.1 General principles
2.2 Definition section of the wire to open pads
2.3 Definition section of the wire flush pads
2.4 Busbar systems
3. Determination of voltage drop
3.1 The maximum limit of the voltage drop
3.2 Calculation of voltage drop under constant load
4. Short-circuit current
4.1 Short-circuit current at the terminals of the secondary winding down distribution transformer
4.2 3h_faznogo short circuit current (Isc) anywhere in the installation of low voltage
4.3 3h_faznogo current short circuit at the receiving end of the power line depending on the source end Isc
4.4 Short-circuit current supplied from the AC generator or inverter
5. Private current cases G33 short circuit
5.1 The calculation of the minimum short-circuit current values
5.2 Checking the heating cables on the short-circuit currents
6. Protective ground wire
6.1 Wiring diagram and selecting wires
6.2 Selection of wire size
6.3 Protective conductor between the step-down transformer and the main general distribution board
6.4 Equipotential Wire
7. Neutral wire
7.1 Determination of the size of the neutral conductor
7.2 Protection of the neutral conductor
7.3 Open the neutral wire
7.4 Isolation of the neutral wire
Download the Head of F, G, pdf (4020 Kb)
Electrical installation guide: technical solutions Schneider Electric
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