When the NCE PowerCab (all-in-one DCC system) was being
developed, there was no electronic circuit breaker that would
react fast enough to keep the protection circuitry in the Pow-
erCab from tripping. In response to the desire by users to sep-
arate districts, NCE developed the CP6 [2]. This circuit board
holds six bulbs, allowing a PowerCab user to split his pike into
six sections. The user has a choice of (standard) 1-amp bulbs
or (optional) 1.75-amp bulbs. The PowerCab can only supply
about 1.75 amps. So, consider the standard 1-amp bulbs. If
a short occurs in one district, the remaining five continue to
operate, but only have about ¾ amp remaining available. If a
second district has a short, the combined two bulbs will try
to draw 2 amps from the PowerCab (plus any current being
drawn in the remaining four districts) and the PowerCab will
still shut down.
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