This is a work at home issue. We have a user running a 1500VA UPS powering a desktop and monitor from a 15 Amp outlet protected by an AFCI. She is getting nuisance trips when she is not even working on the machine? My guess is probably when the UPS does it's periodic battery test. This is...
We are working on a project installing a submarine power cable. It has been suggested that we install load breaks in the manhole where the cable transitions from submarine cable to terrestrial cable to allow isolating the two segments for troubleshooting in the future.
My first inclination was...
We have a privately own/maintained bridge that is 15'W X 35'L. With Concrete abutments, 4-5 steel I beams spanning between the abutments and wooden decking (4X10s??).
We are working with a structural engineer and looking for a crew to do needed maintenance on the bridge. I am looking to...
Any suggestions for properly sizing HDPE conduits for 4/0 power conductors for a 2200 ft conduit run and sizing an outer conduit to nest three power conduits into?
Regards
Larry
Larry Mackey
I live in an allotment that has a bridge (rated at 25 tons) across a small creek ~30 ft span that consists of I beams between the abutments with timber deck boards (4X12) lag bolted into a board that sits on top of the I-beam (not sure I know the proper name of the component of a bridge?)
The...
I am looking for modeling tools that I can use to model a distribution feeder network that is fed power from substation(s) as well as one or more generators diversely located in the distribution grid.
We have a project where we are looking at connecting one or more alternate energy generators...
Does anyone know of a reference design for multiplexing RS232 channels by over sampling each data channel as opposed to separate UARTS for each data channel at both end of the mux??
I have not worked down at this level in a number of years and got rid of all my reference designs a few moves...
My daughter is looking at buying a house that has rather substantial looking I-Beams evenly spaced along one wall in the basement. Basement wall is block. 1970-80's vintage.
I don't see any indication of horizontal cracks. There is a obvious vertical crack to the left of the array of beams...
We are trying put together an initial budget for some alternate energy projects. Does anyone have a "rule of thumb" or SWAG for a budget to install buried 36KV power cables (2/0 conductors) along a major state highway (2 lane plus shoulders). We need to get the power from the alternate energy...
I am trying to show a customer what happens to a distributed grid when a remote power source has a transient. I understand IEEE 1547 requirements for flicker, et al but would like to be able to provide a reasonably accurate analysis of what happens when a 10MW power source drops offline or...
We are looking for a reference book or tutorial that talks about placement of geophone in terms of designing an array for a survey.
I am looking for something we can reference when making design decisions rather than simply using the "we have always done it this way or that" defense.
Any of...
We are moving the utility service entrance to our house from aerial on the Garage to a location on the house via underground. The utilities come in from the street via two poles. Last pole is 80 ft to the new location on the house.
Going underground to improve "curb appeal" on the house. The...
