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  1. fsck

    Small PLC choice?

    I need to choose and deploy a simple PLC. It will have about 10 digital inputs and 10 digital outputs, split between two specific locations. The main & remote locations will be connected by 100baseT and RS-232, carried by some fiber converters we're using. It would be nice to also be able to...
  2. fsck

    propane tank remote gauging

    I've not found a suitable remote propane tank level gauge. The propane tank industry seems to sell them with built-in cell phones, to call them; not very useful when you want a local readout....and there's no cellphone coverage. I do find <http://www.rochestergauges.com/Pages/PDFs/R3D.pdf> &...
  3. fsck

    SDS and common neutral

    So from what I've read, when you have a generator or other alternate power source, and transfer switch, each is a SDS, and that switch should switch the neutral as well. Neutral is grounded at the source. But the case I'm looking at will have a utility xfmr w/wye secondary at the transfer...
  4. fsck

    VT's off MSP....

    In a new residence being planned, we'll have a: "MSP Meter/Main Service Panel 200A 277/480V 3PH 4W" that will feed a 200A 3ph/4W transfer switch; choosing between the grid above and a backup source. We have no need for any loads on the PG&E side of the transfer switch, save one: VT's & a...
  5. fsck

    VT taps from MSP

    In a new residence being planned, we'll have a: "MSP Meter/Main Service Panel 200A 277/480V 3PH 4W" that will feed a 200A 3ph/4W transfer switch; choosing between the grid above and a backup source. We have no need for any loads on the PG&E side of the transfer switch, save one: VT's & a...
  6. fsck

    ID 3-phase ammeter?

    I found a 4.25" three-phase ammeter at a hamfest today, and bought it for a song. Unlike much of the things I buy, I have an immediate use for this. It has 7-segment displays for all three phases, some alarm limits & will show neutral current. It mounts in 3.97" circular hole. It's got a...
  7. fsck

    Grounding &amp; Protection on streetlighting

    In 2004, a PhD student was electrocuted in NYC by a hot junction box cover. I was quite interested in the case because a friend's Seeing Eye dog was similarly killed (in another city..) a day or two later. Jody Lane's family settled with ConEd by establishing a foundation in her name...
  8. fsck

    Reduced voltage starter

    Does any vendor still sell resistive reduced voltage starters? I seek same to limit inrush surge on a large transformer. This is 3 phase 208, FLA of ~50A application. Thus far, I can't find a source: be it new, NOS or refurb. Many vendors have tried to sell me SCR-based "soft-starters" but...
  9. fsck

    Diesel vs. propane

    I'm looking for case studies on propane vs. diesel costs in a standby power application of 15-25KW. Obviously, the relative fuel costs will favor diesel, while the initial purchase & lower maint. costs favor propane. At some # of hours/year, the lines cross. My goal is get some numbers to...
  10. fsck

    ConEd vs. mork parrots

    This story is a good reminder that out in the field, not all the problems you have were covered in school/training/ops manuals: http://cityroom.blogs.nytimes.com/2009/04/22/hootie-and-the-parakeets-round/ ConEd has ongoing issues with the Queen's wild parrots, who love warm places to nest...
  11. fsck

    Wye not delta?

    First, I appreciate my fellow's engineer's patience on what, to people who build MW power systems, must seem like a gnat's worth of watts. Here's another view of the proposed system. The issue is the backup inverters do not supply 277 P-N, just 120V. So to feed the long cable, we need a step-up...
  12. fsck

    One transformer or two?

    The electrician planner has spec'ed a 112.5kva 480 delta:208/120 wye transformer. This is to handle the house and pool loads. This is a challenge but allegedly not impossible to also feed from the limited standby power. I was debating in my head the pros & cons of instead having say a ~75kva...
  13. fsck

    Limiting inrush current

    Was reading <http://www.eng-tips.com/viewthread.cfm?qid=272481&page=1> with interest. Has anyone dealt with transformer startup surges & inverter sources? This installation shall have a 112.5 kva 3ph 480:208/120 transformer at the house, about 1000 ft. away from the utility building (feed)...
  14. fsck

    480 delta; neutrals &amp; grounds....

    I have two proposals offered to carry 480 Delta/200A service about 1000 ft. to a 208/120v destination. One uses a 480:4160v 112.5 KVA transformer at the meter, 3*#6MV-105 cable, and a 4160:208/120Y transformer at the house. The other approach uses 3*250 MCM cable to carry 480, & one...
  15. fsck

    Grounding and water wells &amp; Ufer

    Givens: planned large residence, incoming 480V Delta service, poor ground conductivity [2nd hand/anecdotal report.] The property will have a house and a 1000 ft distant shed. The outbuilding will have the incoming service/meter; the house will then be fed by onward CPE buried cable. Each...
  16. fsck

    Pull disconnects; still allowed in code?

    There are dozens of resi. 240VAC heat pumps in this area with the "at the unit" disconnect being a pull block. You pull the phenolic chunk with 4-prongs out; and the unit is dead until you replace it. Are they still legal for new installations; and if so, what are they formally called? I've...
  17. fsck

    Basic high voltage switching/planning queries

    I'm an EE helping a homeowner planning a new residence in CA. The property will be fed with 4160v/20A, and we'll have a grid-tie solar array, backup inverters & generator. The house will be fed with 208/Wye. I'm trying to SWAG ideas & prices before he goes to the local PE for a legal design...
  18. fsck

    fiber inner sleeve

    I'm seeking a {brand} name for the protective sock that goes inside polyethylene fiber duct. It's a woven hollow tube; you pull in say 6 of them, then the fiber is pulled down the middle of each sock. This not only protects fiber from abrasion but also tangles with adjacent fiber bundles. I can...
  19. fsck

    Fiber innerduct sock brand name

    [This is hardly a sure hit as the best forum, but it is communications.. if no answers, I'll try another place..] I'm seeking a {brand} name for the protective sock that goes inside a polyethylene fiber duct. It's a woven hollow tube; you pull in say 3 of them, then the fiber is pulled down the...
  20. fsck

    13D water supply rate requirements

    I'm an EE working on a planned multistory 3800ft^2 residence in Northern CA. The house must have sprinklers running off a single combined domestic/fire pump. I'm trying to SWAG the needed capacity for pump & power planning purposes. We are 6-8 months away from a sprinkler designer. The house...

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