NMC-64 Irrigation
Priority specifications
Irrigation Priority from High to Low (1 – High, 6 – Low)
1. Active program or valve.
2. Operating from uncompleted irrigation table.
3. Condition operation.
4. Manual valve operation.
5. Manual program operation.
6. Programs by Start Time; 10 – high priority, 0 – low priority.
If Priority is the same, by lower program number is started first.
Electrical grounding
Electrical equipment can be destroyed or slowly damaged by voltage spikes, lightning
hits, etc’. Proper electrical grounding in combination with the NMC-64 internal
protections is essential to protect the system, reduce the risk of damage and prolong
its lifetime.
Correct selection and installation of equipment will protect your system and reduce the
risk of human injury.
Proper grounding provides an easy path for electrical current to return to its source. A
grounding system should tie all non-current carrying conductors to earth ground (0
volts). The grounding system should present a minimum resistance to current flow.
Make sure all items used are in proper condition, for example, a corroded wire clamp
attaching a ground wire to a ground rod might add 100 ohms or more resistance to a
system.
Less than 5 ohm will be considered as a good ground.
Ground Rods
Ground rods are used to efficiently connect the system to earth where current may be
dissipated in the soil.
• Material:
Ground rods should be copper clad or galvanized steel.
• Diameter:
Minimum 5/8”, preferably 3/4”. Generally the larger the rod diameter, the lower it’s
resistance to current flow.
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