F-1
Appendix F. Step-down Transformer
Installation
This appendix is for users who have a step-down transformer instead of the 100 to 240 Vac
to 24 Vdc power supply.
FIGURE F-1. ET107 pole installation with step-down transformer
User supplies valve box at base of station and weatherproof
enclosure for transformer (FIGURE
).
The ac power option at one time included a 120 Vac to 16 Vac step-down
transformer. The transformer should be mounted inside a user-supplied
junction box according to local electrical codes. Dangerous electrical accidents
may be avoided by locating the transformer remotely and burying a low
voltage line to the station. The low voltage will carry up to 500 feet on an 18
AWG power cable.
1.
Shut off 110 Vac power at the main breaker.
2.
Connect the primary leads of the transformer to 110 Vac following
instructions provided with the transformer.
3.
Connect a two-conductor cable to the secondary terminals of the
transformer.
NOTE
Swept Elbow
Conduit
User-Supplied
Valve Box