City of Frisco Engineering Standards

Version 6/19/12
3.08 WIRING:
A. Sprinkler Controls to Valves:
1. Conduit is not required for U.F. wire unless otherwise noted on plans. Tuck wire under
piping.
2. Make wire connections with waterproof connectors according to manufacturer's
recommendations.
3. Provide a separate wire from controller to each electric valve. Provide a common neutral
wire from controller to valves served by a particular controller.
4. Provide a 24 inch long wire coils at valves.
5. An expansion coil shall be provided every 200 feet, which consists of 10 wraps around a
1" PVC pipe or some other method approved by the Owner.
6. All valve wires from the same controller shall be bundled together every 10 feet with
plastic electrical tape.
B. Wire Testing:
3.09 TESTING:
1. Before any backfills are placed over the communication cable, test the wires with a
megger for wire installation resistance. Minimum insulation resistance to ground shall be
100K OHMS to ground. Any conductor not meeting this requirement hall be replaced
and retested.
2. After backfill is completed, retest the wires with a megger. The minimum acceptable
insulation resistance to ground on this test shall be 100K OHMS to ground. Replace and
retest any conductor not meeting this requirement.
A. Notify Owner to review work 48 hours prior to testing pipe and fittings for leaks.
B. Test mains for a period of four hours under static pressure. If leaks (or pressure drops) occur,
correct defect and repeat test.
3.10 FINAL ADJUSTMENT:
A. Make final adjustments of sprinkler system prior to Owner’s final inspection.
B. Flush system by removing nozzles from heads on ends of lines and operating system.
C. Adjust sprinklers for proper operation and proper alignment for direction of throw.
D. Adjust each section for operating pressure and balance to other sections by use of flow
adjustment on top of each valve. Correct operating pressure at last head of each section - 50
psi for rotary heads and 20 to 25 psi for spray heads.
E. Adjust nuzzling for proper coverage. Prevailing wind conditions or slopes may indicate that
arc of angle or trajectory of spray should be other than as shown on plans. Change nozzles to
provide correct coverage.
3.11 CLEANUP: Keep premises clean and neat.
City of Frisco May 2012
Standard Technical Specification Irrigation System 328000-10