User`s guide

5-12
Here is a second example which illustrates the benefits of the extended performance
specification and the importance of the sub-branching simplification procedure.
Without simplifying the network, the sample topology fails to meet the power
specification. However, the equivalent power network, which ignores the lengths of
all but one of the sub-branches, meets the worst case extended performance power
specification and is therefore an allowable topology.
If the simplified form of the power specification is used instead, the actual network
below would not be allowed. Table 5.4 (worst case) allows only a truncated version of
the network, which has 96 nodes and a 160 meter branch length, instead of 128 nodes
and a 240 meter branch length.
All nodes have 25 mA of application current. The wire type is JY (St) Y 2x2x0.8 and
average wire temperature is 25°C.
Example 2. Actual Network, allowed by extended performance power specification:
16 nodes
8 nodes
50m 10m
30m
8 nodes
10m
320m
LPI-10
16 nodes
10m
16 nodes
10m
16 nodes
10m
16 nodes
10m
16 nodes
10m
8 nodes
30m
8 nodes
30m
10m 10m 10m10m 60m 60m50m 50m
Truncated version, allowed by table 5.4 (worst case):
160m total
16 nodes
8 nodes
50m 10m
30m
10m
LPI-10
16 nodes
10m
16 nodes
10m
16 nodes
10m
8 nodes
30m
10m 10m 10m10m 50m
16 nodes
10m