TABLE OF CONTENTS Lightning protection equipotential bonding of a 'volume to protect' includes all incoming metal installations as explained in Section 4.1.3.1.4. Figure 5.6 a shows an equipotential bonding bar which is used for the main equipotential bonding according to DIN VDE 0100 Parts 410 and 540, as well as for lightning protection equipotential bonding according to DIN VDE 0185.
In the case of extended telecommunication systems, a duly shaped lightning protection equipotential bonding bar (installed at ground level inside the building) also functions as an 'earth bus' and is usually installed as an 'earth ring bus' inside the building (DIN VDE 0800 Part 2). The 'earth ring bus', a ring equipotential bonding bar, is a copper bar having a minimum cross section of 50 mm 2 for surface mounting at a distance of some centimetres from the wall. At distances of about 5 m it should be bonded to the foundation earth electrode (DIN VDE 0800 Part 2) (Figures 4.1.3.1.4 a and 5.2 j). This bonding can also be realized over the reinforcement. An equipotential bonding bar such as that in Figure 5.6a can be sufficient for small local systems.
If the discharge system consists of plain metal components which constitute an effective electromagnetic shield (Figure 5.6 b), the equipotential bonding bars can be directly bonded with the shield. A low-impedance coupling of the external...
