What is the impact to conductors and lugs when terminated to an encapsulated dry-type transformer in a high-ambient environment? Must the transformer be derated to prevent temperature rise from exceeding the temperature/current rating of the conductors and lugs? I'd hate to spec xfmr and...
Are FEMA flood openings required for a garage where the slab is above the base flood evelation, but not above the 1' of wet-floodproofing freeboard required? I can't find anything in writing that says this is exempt, but as the design requirements state that the design should reflect a 1'...
I'm looking at placing a number of equipment racks into a 40' shipping container. Total weight (including the container) is expected to be 43000lbs, but the majority of that weight is going to be concentrated along one bulkhead. Is this acceptable, or is this going to be too destabilizing to ship?
We just put in a 480/277V Y generator feeding a 480V Delta switchboard. During the inspection, we discovered the contractor had grounded the neutral in the generator with 3/0 (same size as the NEC-specced ground wire- looks comically small next to the line conductors). In speaking to the...
I have an uplift load of 125lbs per 16" stud transfered from the 2nd to 1st floor of a 2-story residence. If the sheathing plywood spans the floor and ties into the vertical studs above and below, would the sheathing alone (1/2" CDX ply w/ 6" nail spacing) suffice for uplift or are straps still...
I just had footers dug for my addition (2 story residence, appx 28x40') and, being an EE, I hired what I thought was a professional to do the job. I'm in Chesapeake, VA, 8' above sea level and the ground here is flat and always wet. The soil the footers will be on is hard clay directly beneath...
How do you tune swept waveguide bends to avoid standing waves when the frequency you're using differs significantly from the midband frequency of the waveguide? I've struggled with this question for months now- we certainly never hit on it in emag fields and waves in college, and no textbook...
When pouring a 4" slab-on-ground for light duty residence, should the ends be supported by an L-shaped shoe block or similar end support?
The contractors in the area all insist on doing this to prevent the slab from settling too far, but it seems to me that this would essentially turn the...
