Specifications

Cable grouping
BS7671:2008 introduces new data tables for ascertaining cable grouping
derating factors (Tables 4C1 to 4C5). The cable grouping tab has been
re-designed to accommodate the changes.
In addition, the cable grouping tab now reports the grouping derating
factor (Cg) for the currently selected parameters.
Voltage drop limits
The procedure for setting voltage drop limits has been completely
revised for ProDesign v15. There is now no need to define separate
voltage drop limits for sub-mains and final circuits.
To comply with the voltage drop limits defined in BS 7671:2008 Appendix
12, it is necessary to define the type of supply the network is connected
to. This setting is made in the Voltage tab of the Source, Transformer or
Generator dialog of the Active source of supply.
The global voltage drop limits for the project are set in the Voltage Drop
Settings dialog. These settings determine the maximum voltage drop
permitted between the supply and the terminals of each load. The dialog
is reached from the menu Preferences | Calculations | Voltage Drop, or
from the Voltage Drop Settings button in the Voltage tab of the Source
dialog.
AMTECH Quick Guide 2008 -17
th
Edition • 14