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What Are Threaded Fasteners?

Jeffrey A. Groves, P.E.

Jeffrey A. Groves, P.E.

Threaded fasteners (e.g., bolts, nuts, screws) are so common that it is hard to imagine a world without them. Our society depends on them. Consider the lug nuts that keep the wheels attached to our vehicles while driving or the fasteners that hold together the structural steel members of the...

Why Do Aluminum to Copper Connections Fail?

Electrical connections between aluminum and copper wires present special hazards for property owners. Aluminum to copper connections may deteriorate over time if not installed in a proper manner. A deteriorated connection can lead to overheating, which can result in a fire. Why do aluminum to copper...

Electrocution, Electric Shock, and Safety

The words electrocution and electric shock strike fear in many. However, many people use these two words interchangeably, when in fact they are not the same. An electric shock is when you somehow touch an energized circuit and, as many electricians say, you get "bit". An electric shock can rattle...

Little Black Box - Big Data

Most automobiles and light-duty trucks are equipped with an electronic recording device, also referred to as a “Black Box,” or an “airbag control module” that may contain data related to a crash. The data in a vehicle’s Black Box plays a big role in collision reconstruction. Bosch Crash Data...

Truck Braking

If I’ve heard it said once, I’ve heard it said 1,000 times. It takes longer for a truck to stop than an automobile because the truck weighs more. But, fact is, a truck’s weight has nothing to do with why a truck takes longer to stop. There are many factors that affect the stopping distance of a...

Crawl Space Inspections

D. Justin Reid, P.E.

D. Justin Reid, P.E.

Financial losses can be avoided with periodic inspections of the crawl spaces under residential structures. Oftentimes, a homeowner is unaware of issues in their crawl space until damages have progressed into the interior of their residence.

Do Those Stair Meet Code? Well... It Depends

portrait photo of J. David

J. David Horne, P.E.

It happens, someone has fallen down the stairs. One of the first questions should be, “do those stairs meet code?” EDT engineers are often asked to inspect a set of stairs and determine if they comply with the applicable building codes. The actual onsite inspection is fairly straightforward...

Thermal Effects In Piping Systems

Have you ever turned on the hot water faucet and after a short period of time, heard creaking noises coming from inside the walls or below the floor? While such noises could be unwelcome guests, such as rodents or space aliens, chances are, the noises are being generated by thermal-related pipe...

Is Transformer Gassing Damage?

Scott Cramer

Scott S. Cramer, P.E.

If a transformer sample shows that gases are present within the oil, is the transformer damaged?”. Key gases are defined as gases generated in oil-filled transformers that can be used for qualitative determination of fault types, based on what gases are typical or predominant at various temperatures...

Why Is My AC Leaking Water?

EDT

As summer approaches, air conditioners around the country will start running over time. With that increased usage and warmer weather, instances of water damages related to the operation of “ACs” will increase. In this article, we will review two ways that water damages can occur from an AC.

Pressure Beyond Limits

You may be familiar with the consequences of applying too much air pressure to an item such as a balloon or a tire. Most people intuitively understand that there is only so much air that can be added to your car tires before they burst. Items that are designed to contain pressurized gases or liquids...

Why Is My Building Cracking?

The design and analysis of the foundation system are equally important to provide support to the building. However, more often than not, an adequate investigation, design, and preparation of the ground where the structure and its supporting foundation system are to be built are not taken into...

When the Curtain Falls

portrait photo of Rod

Rod Turk, P.E., CFEI

As the pandemic has resulted in the shuttering of public venues, many owners of properties have turned off the lights and left the spaces conditioned with an eye toward energy (cost) savings. This has left the spaces dark, and unobserved for long periods of time, such as a large movie theater...