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  1. iceworm

    Short Circuit Calculation - Point to Point Method excel sheet

    I don't know how to resolve "15 nodes" and Bussmann Pt to pt. The brochure is available here. Link Bussmann point to point. I suspect that by the time you get done programming an Excel spreadsheet to follow the point to point method, you will be very expert. Link Cooper Bussmann software...
  2. iceworm

    Genset oil leakage

    Ahhh - I can't see the pictures (edit to addOkay - just reloaded and now I can Harmless flakes working together can unleash an avalanche of destruction
  3. iceworm

    Genset oil leakage

    ASSFLOWA - Where is it leaking? Slobbering out the stack? Valve cover gaskets or the like? Harmless flakes working together can unleash an avalanche of destruction
  4. iceworm

    charger for mobile substation

    I like Sens. They are not particularly small Harmless flakes working together can unleash an avalanche of destruction
  5. iceworm

    Short Circuit Calculation - Point to Point Method excel sheet

    Busmann point to point? Harmless flakes working together can unleash an avalanche of destruction
  6. iceworm

    Motor overload tripping question

    Look at 430.32.A.1 and 430.32.C Overloads are set by the specific motor nameplate FLC, not from T430.250. However 430.250 lists 27A FLC as typical for a 20 HP As an example: Using a 20 HP motor, 27A flc and 1.15 sf, the overload normal setting is 125% X FLA = 1.25 X 33.8A And, per 430.3.C...
  7. iceworm

    Professional Development

    I work under US law and NEC. If you are not, substitute what fits. I'm a field dog, not a designer. And I'm getting ready to retire after 50 years of this. Could be there is much better, more current thinking: PE ticket requires 24 hours CE biannual. Electrical Administrator (called a...
  8. iceworm

    Changing from DC motor to an AC motor.

    Bill - You get to say anything you want. Apparently if I disagree my post gets deleted. Interesting concept. Unlike you, I could be in error. That was 35 years ago and I was not the engineer of record. Just curious - Where were you in 1985 - 1987? This was in Sitka. We did have a guy named...
  9. iceworm

    Changing from DC motor to an AC motor.

    Disclaimer - I am not a crane drive specialist. I have only been involved with one of these conversions. It was one of the most tangled, piss-poor jobs I have ever been next to. This was 35 years ago. I may (likely) not remember all. I'll keep the names secret to protect the guilty. The...
  10. iceworm

    Oil type transformers in Hazardous Area

    Disclaimer: All my experience is with CI, D1, or D2 - no Zones. So there could be minor differences. I have never seen oil filled transformers in classified areas. Probably because of all the protective switches, oil level, winding temperature, rapid rise ... I've never seen any that were...
  11. iceworm

    NEMA 14-50 and 6-50 Outlet on Same 50amp Circuit

    Assumption: installation is per NEC 2017 NEC sections are 210.21 and 210.23 The short answer is to put in a DPDT 60A Switch, such as a generator transfer switch example SQD DTU223RB List price is $1300 Residential example: Home Depot 100A GE, Nema 3R $140 You didn't ask, but there are...
  12. iceworm

    Starting 250 HP Motor

    The only way I have seen is using a VFD programmed for "flying start". Harmless flakes working together can unleash an avalanche of destruction
  13. iceworm

    Two emergency generators

    I asked that too: 400KW on the Crit/LS 1200KW Equip feeds Harmless flakes working together can unleash an avalanche of destruction
  14. iceworm

    Copper Coated Aluminum Fine Strand

    Thanks for the response. I wasn't ignoring you, just out on a job for a few weeks. So, no known supplier? Harmless flakes working together can unleash an avalanche of destruction
  15. iceworm

    Copper Coated Aluminum Fine Strand

    Has anyone seen fine strand aluminum - copper coated strands, 2/0 - 350kcmil range? I envision something similar to DLO. I have heard of it. However, I have never seen any. Has anybody heard of a supplier? Harmless flakes working together can unleash an avalanche of destruction
  16. iceworm

    Why is it OK per the NEC for feeders over 1000V to not have overcurrent protection at their rating?

    full throttle Harmless flakes working together can unleash an avalanche of destruction
  17. iceworm

    Why is it OK per the NEC for feeders over 1000V to not have overcurrent protection at their rating?

    As discussed, utilities set up to where smoking conductors and the occasional flaming transformer are acceptable. They are not bound by the NEC. Us mortals on the customer side of the service are not only bound by the NEC. Generally our customers (industrial in my case) insist that the...
  18. iceworm

    Effects of leading power factor?

    Sounds pretty good. Couple of minor points, that I think you know (refer to my posts, May 2, May 3) If this is per the NEC, Article 460 is the guide for selecting Conductor Ampacity, Disconnect, and fuses. And of course 240.21.B tap conductors The numbers you have picked out meet Art 460...
  19. iceworm

    Which short circuit level can I assume for a 13.2 kV line?

    One of my clients has a 138kv service 385 MVA. The client owns the xfm,13.8kv, 20 MVA, 8% Another has 69KV service, 100MVA, xfm 13.8kv, 20MVA, 8%Z. These are both really little utilities and the clients are at the end of a long line. The xfm impedance pretty well overwhelms the effect of the...
  20. iceworm

    Electrical Part in the Project

    And I'm sure these tactics have worked well for you and Gunnar - and will continue to work well. This is not news. But, it is also not my career path choice. That's why they hire guys like you and Gunnar - you can do this. Although it seems a bit ludicrous to think the top management is...

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