If you are talking about grounding electrodes , the types are spelled out in the electrical code book. It can be 2 eight foot rods spaced 10 foot apart. One ten foot rod and just newly accepted a grounding plate dug in to a two foot depth.
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IGNITION ELECTRODES IMPLIES TWO ARE INSTALLED. TWO ELECTRODES IMPLIES AN OIL FIRED BOILER. THE ELECTRODES ARE TIED ELECTRICALLY TO THE SECONDARY WINDINGS OF A HIGH VOLTAGE TRANSFORMER. DURING IGNITION THE TRANSFORMER PRODUCES A SPARK BETWEEN THE ELECTRODES TO IGNITE THE ATOMIZED MIXTURE THAT THE BURNER MOTOR AND OIL PUMP PRODUCE AND DELIVER VIA THE NOZZLE. LC
3 types Of welding machine suitable for E 308-15 electrodes?
Choosing one of the six commonly available tungsten electrodes is a crucial first step in successful gas tungsten arc welding (GTAW).
carbon content
Coated electrodes