6
Notes and warnings
PRC-E Series Instruction Manual
MN014003EN August 2015 www.eaton.com
PRC-E Series Externally Mounted Controller Cabinet
Personnel installing the PRC-E Series externally mounted
controller cabinet are responsible for providing and
terminating the power wiring. Standard configurations
accommodate either 120 or 277 Vac supply power. Be
certain to match the controller power to the appropriate
power rating of the externally mounted controller cabinet.
Table 1
cross-references the standard transformer lead
colors with the supply voltage for all supplied transformers.
Table 1 . Transformer Lead Colors/Supply Voltage—
Cross Reference
Primary
Color
Secondary
Color
COM
Black
30 Vac
Yellow-White
120 Vac
White
COM
Yellow
208 Vac
Red
—
—
240 Vac
Orange
—
—
277 Vac
Brown
—
—
480 Vac
Grey
—
—
otee:
N
The primary supply transformers are prewired in
the panelboard and external control cabinet to meet
the selected voltage. The secondary leads are pre-
wired to the supply connector of the PRC-E Series
controller and inserted into the supply socket of
the controller. The yellow secondary lead is also
connected to chassis ground.
Low voltage device termination
All open area inside the PRC-E Series controller enclosure
is low voltage / Class 2. No voltages above 30 Vac are
permitted in this area. Inputs and outputs are designed as
either dry contact or low voltage level.
No external voltages should be applied to the low voltage
terminal blocks. The panelboard provides all necessary power.
Low voltage devices should be terminated using a minimum
#22 AWG twisted-pair wire. Shielding is generally not
required. Low voltage device cables should not be located in
the same conduit with the Class 1 load wires. Be sure the
wire type you use is rated properly, especially for plenum or
hazardous applications.
otee:
N
When wiring to the PRC-E Series controller and
BCBs mounted inside the panelboard, it is necessary
to observe the 600 V insulation rating of any Class 2
wiring in the panelboard gutter. If the wiring is not
rated at 600 V, then any wiring passing through the
gutter will need to be enclosed in conduit or other
recognized material.
Breaker Control Bus (BCB) wiring
Each BCB has two 4-pin combination power/data
connectors. These connectors are shown in
Figure 8
labeled as “SLAN/power connectors.” Also shown in
Figure 8
are the controllable circuit breaker connectors for
plugging in BABRSP or GHQRD controllable circuit breakers
and the “SLAN address switches” used to set the relative
position. Additionally the BCB contains three recessed LEDs
to indicate the status or condition of the BCB.
Figure 8 . PRC BCB Connectors, Switches, and Indicators
It is recommended to use 16 AWG, 4-conductor cable with
600 V insulation jacket (e.g., Alpha 1064) for interconnecting
BCB modules. This cable will support a total SLAN length of
150 feet before requiring an auxiliary power source.
otee:
N
Surge protection is recommended for SLAN
networks in noisy environments (B&B model
#485HESP or equivalent) and fiber-optic cable
is recommended for outdoor, underground, or
between-structure applications.
The relationship between the BCB and the controller can
best be seen in the Externally Mounted Controller depiction
in
Figure 9
. This diagram shows a simple daisy chain
connection between the PRC-E Series externally mounted
controller cabinet and the BCB modules installed in a Pow-R-
Command Expansion panelboard (PRCEP). For PRC-E Series
Master panelboards with integral PRC-E Series controller, the
controller would be wired internally in the first panelboard
(BCB 1, 2) and then to the remaining PRCEP panelboards.
Figure 9 . PRC-E Externally Mounted Controller Cabinet
and PRCEP Panelboards with Left and Right BCBs