Are aluminum ladders cast aluminum?

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They pose additional risk of electric shock because they are good conductors of electricity.

Yes, but only to the point of forming the normal oxide coating. After this, it is fine.

Generally they are not as strong as fiberglass and they conduct electricity.

Before use, perform a thorough inspection and look for damage, bent rungs, grease on tread, defective feet, etc. Follow the labels on the ladder and the owner's manual. If you don't have the manual...