GE Industrial Solutions Entellisys System User Manual - Manual (Page 185)

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15.4 Roof
To distribute control power to the gear, the four protected output circuits are typically brought
to the roof(s) of the vertical stack(s) housing the UPSs. Power lines are then daisy-chained to
terminal blocks on the roofs of the other switchgear stacks as necessary (see Figure 15-1).
Circuit breaker and instrument control power is brought only to stacks having circuit breakers
and instruments, respectively.
15.5 Instrument and circuit breaker compartments
From the roof, control power is brought to each compartment as its contents require (see
Figure 15-1). Wires are daisy-chained when multiple compartments in the same stack require
control power.
Apart from the input and output UPS fuses, instrument compartments contain no fuses.
Compartments for manually operated circuit breakers have no fuses.
Compartments for electrically operated circuit breakers have up to five fuses accessible behind
their doors. At the left of the compartment are fuses for the circuit breaker spring charge motor,
close coil, and shunt trip. At the right of the compartment are fuses for the set and reset coils of
the network interlock accessory. These two fuses are only present when the compartment is
intended for a circuit breaker having the network interlock device.
The close coil, shunt trip, and network interlock circuits derive power from the Entelliguard
Messenger, which is powered by both of the UPS-protected control power circuits. Power to the
spring charge motor, however, is not derived from the UPS protected control power system.