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Dielectric Testing


ETS, Inc. provides annual inspections and dielectric testing that can verify that the machines upper and lower booms, buckets and liners are electronically insulated, meeting ANSI A92.2 standard. Safety is comes first!

Why & How Often?

Initial Inspection and Tests

Prior to initial use, all new or modified mobile units shall be inspected and tested to ensure compliance. Certification by the manufacturer, dealer, final installer or an equivalent entity meets this requirement.

Regular Inspection and Tests

The inspection procedure for mobile units shall be set by the owner in accordance with the manufacturer’s recommendations. However, intervals are dependent upon component function and exposure to wear, deterioration and other agents which adversely affect the component devise. In most cases, Periodic Inspection and Testing occur in 12-month intervals.

The following inspections and tests shall be performed by the operator periodically:

  1. Conduct a walk around visual inspection looking for damaged components, cracks or corrosion, excessive wear and any loose, deformed or missing bolts, pins, fasteners, locking devices and covers.
  2. Check visual and audible safety devices for proper operation.
  3. Visually inspect fiberglass and insulating components for visible damage and contamination.
  4. Check for missing or illegible operational and instructional markings.
  5. Check for hydraulic and pneumatic systems for observable deterioration and excessive leakage.
  6. Check electrical systems related to the aerial device for malfunctions, signs of excessive deterioration, dirt and moisture accumulation.
  7. Perform functional test to include the following:
    1. Setup the aerial device for operation, including outriggers.
    2. Cycle the aerial device function’s through the complete range of motion from the lower controls, except where operation through the complete range of motion would create a hazard
    3. Check functionality of emergency controls

Any suspected items shall be carefully examined or tested and a determination made by a qualified person as to whether they constitute a safety hazard. All unsafe items shall be placed or repaired before use by ETS, Inc.

Dielectric Test Equipment can be used to identify failures which may be cause by the following occurrences:

  • Contamination of insulator surfaces
  • Chemical (internal and external) deterioration or rubber insulating material
  • Moisture absorption
  • Incipient faults and internal voids, as a result of ionization caused by partial discharge
  • Improper insulating material with inadequate dielectric constraints or voltage withstand ability