Electrical Maintenance Worker ; High Voltage

This employee, in departments other than Traffic Engineering, performs the work as a Substation Maintenance Technician on voltages up to 138,000. This position may direct work of others in more difficult and complex types of electrical work including work on high voltage. Work includes more advanced technical knowledge of electrical controls and complex devices. Duties include layout and installation, maintenance, repair, replacement, adjustment, inspecting, cleaning, testing, and troubleshooting of electric and electro‑mechanical systems and component parts.

Employee troubleshoots on electrical, hydraulic or pneumatic controls and low voltage control wiring on any type of equipment or tools; works on buildings, grounds, machinery, sound and alarm systems, in the field, or at the shop; may be assigned to work in confined areas or at unusual heights such as scaffolding, aerial ladders, bucket trucks, poles, or other building structures or water towers;

uses and analyses thermography; works with Variable Frequency Drive (VFD) units and on equipment that operates on 5000 or more voltages (high voltage), single phase and three phase wiring which may include machinery, distribution systems, switch gear, transformers, sub‑stations, control circuits, etc., and their components. Performs related duties as required.

• Medium Voltage switching procedures and safe practices.
• Rewiring of light fixtures.
• Hardware and fittings of the electrical trade (various gauges and types of wire, conduit, couplings, fittings, relays, boxes, circuit breakers, etc.)
• Safety precautions (including lock-out tag-out procedures) necessary when working with electricity, especially high voltage, and around machinery with exposed moving parts.
• Safety with high voltage (HV) including the use of HV gloves, blankets, hotsticks and remote racking; formal training and experience in switching, isolating and maintaining high voltage and other potentially dangerous systems.
• Principles with advanced experience and understanding of safety concerns, clearances necessary, and precautions associated with high voltage equipment.
• Basic electrical theory‑circuits and conductors.
• Electrical terminology, codes, and symbols to read schematics and blueprints.
• Typical hand tools used in electrical work (cable connectors, crimping tool, pliers, wire cutters).
• Typical electrical test instruments (ammeter, voltmeter, meggar, multimeter).
• Electrical formulas and computations involving adding, subtracting, multiplying, and dividing fractions and decimals.
• How various circuits, equipment, and controls operate, fit, and work together.
• Proper operation of electric motors.
• Electric control circuits and complex device operations including Variable Frequency Drives (VFD), Programmer Logic Controllers (PLC), Remote Terminal Units (RTU), Programmable Relays and other Electronic System Controllers.
• A wide range of electrical devices that require service and trouble shooting which may include:
  • Low voltage systems (monitors, alarms, security and safety systems, lighting, communications, fiber optic, LAN, computer networking devices, etc.)
  • Medium voltage systems (controllers, switches, panels, circuit breakers, control power transformers, HVAC equipment, MCC, protective relays, transfer equipment, UPS and power conditioning equipment, emergency generators, medium voltage switch gear and substation equipment, lightning arresters, insulators, interrupters, voltage regulators, isolation transformers, power factor capacitors, etc.)
  • High voltage systems (high voltage substations and switch gear, high voltage SF6 and vacuum circuit breakers, high voltage cable and terminations, etc.)

• Troubleshoot power quality and power outage issues to quickly and safely restore…