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8 - RECOMMENDED WIRE SECTIONS
Wire sizing is the responsibility of the installer, and depends on
the characteristics and regulations applicable to each installation
site. The following is only to be used as a guideline, and does
not make Carrier in any way liable. After wire sizing has been
completed, using the certified dimensional drawing, the instal-
ler must ensure easy connection and define any modifications
necessary on site. The connections provided as standard for the
field-supplied power entry cables to the general disconnect/
isolator switch are designed for the number and type of wires,
listed in the table below.
The calculations are based on the maximum machine current
(see electrical data tables) and the standard installation practises,
in accordance with IEC 60364, table 52C.
- For 30RA units, installed outside, the following standard
installation practises have been maintained:
No.17: suspended aerial lines, and No. 61: buried
conduit with a derating coefficient of 20.
The calculation is based on PVC or XLPE insulated
cables with copper core.
A maximum ambient temperature of 46°C has been
taken into consideration.
The given wire length limits the voltage drop to
< 5% (length L in metres - see table below).
IMPORTANT: Before connection of the main power cables
(L1 - L2 - L3) on the terminal block, it is imperative to check
the correct order of the 3 phases before proceeding to the
connection on the main disconnect/isolator switch.
Unit S Min. (mm
2
) Cable type L (m) S Max. (mm
2
) Cable type L (m)
by phase by phase
30RA 040 1x 6 XLPE Cu 90 1x 16 PVC Cu 245
30RA 050 1x 6 XLPE Cu 80 1x 25 PVC Cu 300
30RA 060 1x 10 XLPE Cu 110 1x 25 PVC Cu 300
30RA 070 1x 10 XLPE Cu 100 1x 35 PVC Cu 310
30RA 080 1x 16 XLPE Cu 125 1x 50 PVC Cu 350
30RA 090 1x 16 XLPE Cu 115 1x 70 PVC Cu 380
30RA 100 1x 25 XLPE Cu 145 1x 70 PVC Cu 380
30RA 120 1x 25 XLPE Cu 135 1x 95 PVC Cu 410
30RA 140 1x 35 XLPE Cu 150 1x 120 PVC Cu 435
30RA 160 1x 50 XLPE Cu 180 1x 120 XLPE Cu 400
30RA 200 1x 70 XLPE Cu 180 1x 150 XLPE Cu 335
30RA 240 1x 70 XLPE Cu 180 1x 185 XLPE Cu 345
S Power supply cable section (see the diagram in chapter: "Electrical connection")
8.1 - Field control wiring
For the field control wiring of the following elements please
refer to the 30RA/RH - RY/RYH “B” series Pro-Dialog Plus
Control manual, and the certified wiring diagram supplied with
the unit:
- Unit start/stop
- Heating/cooling selection
- Set-point selection
- Customer interlock - (example: auxiliary contact of the
chilled water pump contactor)
- General alarm reporting, circuit A and circuit B
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