Scenario: The owners of Jones’ Marine, a marina with a wharf structure on a tidal saltwater river, cater to the operators of ships, barges, and large yachts. There are both diesel and gasoline fuel pumps at the edge of the wharf. In addition, a large mobile crane for lifting the large vessels out of the water for maintenance is in service at the wharf. This crane is driven out to the edge of the wharf deck suspended over the water, subjecting this deck and the structure beneath it to very high loading. They purchased the property from its former owners about 10 years ago and are conscientious about maintenance and upkeep of their thriving facility. They decide it is time to have a survey performed of the condition of the precast reinforced concrete piles and pile caps beneath and supporting the concrete wharf platform/deck. They are alarmed at what is discovered by this survey: Significant spalling Read More
Temporary wiring is just that….temporary, and is typically used for repair and maintenance projects. In this blog I am going to discuss guidance offered by Article 590 of the National Electric Code (NEC), as well as some points to consider when using temporary wiring, including extension cords and holiday lighting.
Before each use, extension cords need to be inspected for visual damage. Cords with cuts or splits to the insulation need to be discarded. Cords with damage to the connectors, including those that feel loose when connected, need to be taken out of service. Failure to properly select and use extension cords can have a catastrophic result. Read More