Honeywell SmartVFD HVAC MR4 User Manual page 24

P
OWER CABLING
4.1.1.1 Cable and fuse sizes, frames MR4 to MR6, North America
The recommended fuse types are gG/gL (IEC 60269-1) or class T (UL & CSA). The fuse volt-
age rating should be selected according to the supply network. The final selection should be
made according to local regulations, cable installation conditions and cable specification. Big-
ger fuses than what is recommended below shall not be used.
Check that the fuse operating time is less than 0.4 seconds. Operating time depends on used
fuse type and impedance of the supply circuit. Consult the factory about faster fuses. Honey-
well offers recommendations also for high speed J (UL & CSA ), aR (UL recognized, IEC
60269-4) and gS (IEC 60269-4) fuse ranges.
*
Frame Type
C 0015
C 0020
MR4 C 0030
C 0050
C 0075
C 0100
MR5 C 0150
C 0200
C 0250
C 0300
MR6
**
C 0400
*. For more information on type code, see page 8.
**. The 460V models require 90-degree wire to meet UL regulations
Table 8. Cable and fuse sizes for Honeywell Smart VFD HVAC (MR4 to MR6)
The cable dimensioning is based on the criteria of the Underwriters' Laboratories UL508C:Cables must
be PVC-isolated; Max ambient temperature +86°F, max temperature of cable surface +158°F; Use only
cables with concentric copper shield; Max number of parallel cables is 9.
When using cables in parallel,
area and the max number of cables must be observed.
For important information on the requirements of the grounding conductor, see standard Underwriters'
Laboratories UL508C.
For the correction factors for each temperature, see the instructions of standard Underwriters' Labora-
tories UL508C.
Fuse Mains, motor and
I
L
(class T)
[A]
[A]
3.4 6 AWG14
4.8 6 AWG14
5.6 10 AWG14
8.0 10 AWG14
12.0 20 AWG14
16.0 25 AWG10
23.0 30 AWG10
31.0 40 AWG8
38.0 50 AWG4
46.0 60 AWG4
61.0 80 AWG4
NOTE HOWEVER
ground cable
Main terminal
Cu
AWG24-AWG10 AWG17-AWG10
AWG24-AWG10 AWG17-AWG10
AWG24-AWG10 AWG17-AWG10
AWG24-AWG10 AWG17-AWG10
AWG24-AWG10 AWG17-AWG10
AWG20-AWG5
AWG20-AWG5
AWG20-AWG5
AWG13-AWG0
AWG13-AWG0
AWG13-AWG0
that the requirements of both the cross-sectional
Honeywell
Terminal cable size
Ground
terminal
AWG17-AWG8
AWG17-AWG8
AWG17-AWG8
AWG13-AWG2
AWG13-AWG2
AWG13-AWG2
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