Category C Aerial Device
Relevant Standard CSA C225-10
Electrical Testing of category C aerial devices are tested in compliance with CSA C225-10 and is required to be tested annually.
Relevant Products
If it has an insulated fiberglass boom it can be tested. Common manufactures of aerial devices are Terex, Altec and Versalift.
Cleaning of Insulated Boom
The insulating booms are cleaned with alcohol if required to remove dirt and debris and polished with wax wipe cloth to maintain hydrophobic surface.
Visual Inspection of Insulated Boom
Upper and lower boom are inspected for scratches, chips and larger damage that could cause water ingress into the fiberglass.
Visual Inspection of Insulated Boom
Upper and lower boom are inspected for scratches, chips and larger damage that could cause water ingress into the fiberglass.
Electrical Test of Category C Aerial Devices
The upper insulating boom is tested to 40kV AC and the maximum allowable leakage is 400 microamps for 1 minute. (Periodic Test)
The lower insulating boom is also tested at 35 kV AC and maximum allowable leakage of 3 milliamps for 3 minutes. (Periodic Test)
Bucket Liners are removed and tested at 35kV AC for 1 minute.
Hydraulic oil also tested to ASTM D877 or D1816 depending on the clients requirements
Failure Modes
Typical failures for category C aerial devices are bucket liner failures or hydraulic oil.
Care and Storage
Wrap insulated booms with covers if available to protect from natural elements when not in use. The same goes for the bucket liner covers, the more these can be protected the longer they will last and the safer they will be.
When connecting hydraulic tools to the aerial device clean the truck and tool hook ups to avoid debris/contaminants in the hydraulic line that could compromise the dielectric properties of the oil.