A
CU MANUAL
IOM-14
28 of 46
Feb 06 R4
All penetrations through the unit walls must be caulked and sealed to prevent air and/or water from
entering the unit.
ELECTRICAL INSTALLATION
DO NOT install anything that will interfere with equipment access or the rating plate.
The unit must be electrically grounded and all wiring must be installed in accordance with the National
Electrical Code, ANSI/NFPA 70, and/or the Canadian Electric Code CSA 22-1 and to the approval of the
authorities having jurisdiction.
THE FLOOR OF THE UNIT HAS BEEN MADE WATER-RESISTANT. DO NOT
CUT OR DRILL HOLES IN THE FLOOR OR USE PENETRATING FASTENERS.
Field wiring diagrams, internal
wiring diagrams and operating functions are included in the control cabinet. The power requirements are
indicated on the rating plate. Where field wiring of control circuits is required, take care to size the field
wiring for a maximum 10% voltage drop. The control circuit ampacity is noted on the field wiring diagram.
See the field wiring diagram for requirements for shielded or twisted pair wire for solid state devices.
Warning:
No unspecified external load shall be added to the control transformer circuit(s) or to
the main power circuit(s).
Recommended 24V Field Wiring Size:
Copper conductors only
Circuit
Load
(Amps
) (1)
Maximum Total Length of Run
< 50 Ft < 100 Ft < 150 Ft < 200 Ft < 250 Ft < 300 Ft < 350 Ft < 400 Ft < 450 Ft < 500 Ft
(~ 15 m) (~ 30 m) (~ 45 m) (~ 60 m) (~ 75 m) (~ 90 m)
(~ 105
m)
(~ 120
m)
(~ 135
m)
(~ 150
m)
1
16 AWG 16 AWG 16 AWG 16 AWG 16 AWG 16 AWG 14 AWG 14 AWG 14 AWG 12 AWG
2
16 AWG 16 AWG 16 AWG 14 AWG 12 AWG 12 AWG 12 AWG 10 AWG 10 AWG 10 AWG
3
16 AWG 16 AWG 14 AWG 12 AWG 12 AWG 10 AWG 10 AWG 10 AWG
4
16 AWG 14 AWG 12 AWG 10 AWG 10 AWG 10 AWG
5
16 AWG 12 AWG 12 AWG 10 AWG
6
16 AWG 12 AWG 10 AWG 10 AWG
7
14 AWG 12 AWG 10 AWG
8
14 AWG 10 AWG 10 AWG
9
14 AWG 10 AWG
10
12 AWG 10 AWG
11
12 AWG 10 AWG
12
12 AWG 10 AWG
13
12 AWG
14
12 AWG
15
12 AWG
Notes:
