Fig. E1 – An example of a block of flats in which the main earthing terminal (6) provides the main equipotential connection; the removable link (7) allows an earth-electrode-resistance check (DB422160_EN)
Fig. E3 – TT System (DB422161_EN)
Fig. E4 – TN-C system (DB422162_EN)
Fig. E5 – TN-S system (DB422163)
Fig. E5 – TN-C-S system (DB422164_EN)
Fig. E7 – Connection of the PEN conductor in the TN-C system (DB422165_EN)
Fig. E8 – IT system (isolated neutral) (DB422166_EN)
Fig. E9 – Leakage impedance to earth in IT system (DB422167_EN)
Fig. E10 – Impedance equivalent to leakage impedances in an IT system (DB422168_EN)
Fig. E11 – IT system (impedance-earthed neutral) (DB422169_EN)
Fig. E12 – TT system (DB422170)
Fig. E13 – TT system (DB422171)
Fig. E14 – TT system (DB422172)
Fig. E15 – IT system (DB422173_EN)
Fig. E18 – TN-S island within an IT system (DB422175_EN)
Fig. E19 – IT islands within a TN-S system (DB422176_EN)
Fig. E20 – Conductor buried below the level of the foundations, i.e. not in the concrete (DB422177)
Fig. E21 – Earthing rods connected in parallel (DB422178)
Fig. E22 – Vertical plate - 2 mm thickness (Cu) (DB422179)
Fig. E25 – Earthing rods (DB422180)
Fig. E26 – Measurement of the resistance to the mass of earth of electrode (X) using an earth-electrode-testing ohmmeter
(DB422181a_EN)
(DB422181b)
Fig. E27 – A sub-distribution switchboard (Prisma Plus G) (PB116717)
Fig. E28 – [a] A main LV switchboard - MLVS - (Prisma Plus P) with incoming circuits in the form of busways - [b] A LV motor control centre - MCC - (Okken)
(PB116715)
(PB116716)
Fig. E29 – Final distribution switchboards [a] Prisma Plus G Pack; [b] Kaedra; [c] mini-Pragma
(PB116718)
(PB116719)
(PB116720)
Fig. E30 – Assembly of a final distribution switchboard with fixed functional units (Prisma Plus G) (PB116721)
Fig. E31 – Distribution switchboard with disconnectable functional units (PB116722)
Fig. E32 – Distribution switchboard with withdrawable functional units in drawers (PB116723)
Fig. E33 – Main actors and responsibilities, as defined by the IEC 61439-1&2 standard (DB422182_EN)
Fig. E36 – Representation of different forms of LV functional distribution switchboards (DB422183_EN)
Fig. E38 – Conductor identification on a circuit breaker with a phase and a neutral (DB422184_EN)
Fig. E39 – Radial distribution using cables in a hotel (DB422185_EN)
Fig. E40 – Busbar trunking system design for distribution of currents from 25 to 4000 A (DB422201_EN)
Fig. E41 – Radial distribution using busways (PB116725)
Fig. E42 – Example of a set of 14 x 25A loads distributed along 34 meters (for busway, Canalis KS 250A) (DB422186_EN)
Fig. E43 – Rigid busbar trunking able to support light fittings: Canalis KBA or KBB (25 and 40 A) (PB116726)
Fig. E44 – A busway for medium power distribution: Canalis KN (40 up to 160 A) (PB116727)
Fig. E45 – A busway for medium power distribution: Canalis KS (100 up to 1000 A) (PB116728)
Fig. E46 – A busway for high power distribution: Canalis KT (800 up to 5000 A) (PB116729)
Fig. E47 – Appearance of a distorted current waveform due to harmonics (DB422187_EN)
Fig. E48 – Line and neutral currents absorbed by single-phase non-linear loads connected between phase and neutral. (DB422188)
Fig. E49 – Examples of applications where the level of harmonics (THD) is either negligible or high, depending on the proportion of loads generating harmonics versus classical loads
(PB116730)
(PB116731)
Fig. E50 – Typical harmonic phase current spectrum for single-phase non-linear loads (DB422189_EN)
Fig. E51 – Line current for different ratios of non-linear load (DB422191_EN)
Fig. E52 – Neutral conductor load factor as a function of the 3rd harmonic level. (DB422192_EN)
Fig. E53 – Double-neutral installation for cable solution is not directly applicable for busway solution, due to their very different thermal dissipation behaviour. (DB422193)
Fig. E54 – Illustration of the overheating risk with standard busway sizing in presence of high level of 3rd harmonics (DB422194_EN)
Fig. E55 – Cross section architecture of 2 different busbar systems. (DB422195_EN)
Fig. E56 – The most effective solution = reduce the current density in ALL conductors, by selecting proper busway rating (single-neutral) (DB422196)
Fig. E57 – Cross sectional view of a standard busway without and with harmonics (DB422197_EN)
Fig. E58 – Comparison between double-neutral busway solution and properly selected single-neutral solution
(DB422198a_EN)
(DB422198b)
Fig. E59 – Coherent system approach for all components of the electrical installation
- PB115943 85.jpg
(PB115943_85)
(PB116732)
Fig. E60 – Typical harmonic neutral current spectrum for single-phase non-linear loads (DB422190_EN)
Fig. N63 – IP Code arrangement (DB422199_EN)
Fig. N64 – Elements of the IP Code (DB422200_EN)
