161
Zone A Zone B
Earth ODU Mandatory Mandatory
Screen Cable Mandatory Mandatory
Surge Arrestor Unit at ODU – ALPU-
ORT Mandatory Mandatory
Earth Cable at Building Entry Mandatory Mandatory
Surge Arrestor Unit at Building Entry
– ALPU-ORT Mandatory Mandatory
Table 15 - Protection Requirements
Figure 95 - Diagrammatically showing typical wall and mast installations