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  • Users: lyla1711
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  1. lyla1711

    Fiberglass Conduit

    Has anyone ever used fiberglass conduit? I'm working on a site with heavily loaded below grade conduit runs with high load factor, and the fiberglass is supposed to help the cable ampacity derating (it does a better job of radiating heat than hdpe or PVC). I've used the 90s, and they were...
  2. lyla1711

    35kV Line Reactors

    We're working on a 35kV ring bus constructed out of GIS (four buses) and underground conductors. So it will be M-T-M-T-M-T-M-T (back to the first M), with each bus served by a substation transformer running the Delta Var 2 paralleling scheme. The loading on each bus is nearly identical...
  3. lyla1711

    70:250.30(A)(1) Exception 2

    Hello, forum. I've learned a lot reading here over the years - thanks to all the contributors. I have a question on grounding and bonding of a customer-owned primary service in the US, falling under the 2017 NEC. It's semantics, but I'm curious to hear how other interpret it. Article...
  4. lyla1711

    Ductbank Derating

    I know this topic has been discussed a lot here, but I have a situation with a twist that I haven't seen discussed elsewhere. For the overwhelming majority of the run I'm concerned with, it's a textbook three-conduit system directly out of the examples in NFPA 70. For about ten feet before it...
  5. lyla1711

    Opening LV vs MV Breakers

    Looking to get consensus here. I have an application where we can either open a 13.2kV vac breaker (feeding a 2000kVA transformer) or a 3000A 480V unit substation breaker (fed by said transformer). There are about 1200A worth of load on the 480V side. Both breakers can be opened remotely...
  6. lyla1711

    Parallel 15kV Feeders

    We have a situation where we are planning to parallel conductors of different length and characteristics. We have a 15kV M-T-M switchgear with paralleled transformers (automatic tap changer controls fully commissioned for paralleling), but the gear is run with the tie normally open. This gear...
  7. lyla1711

    GSU, Small Industrial Application

    I'm hoping to get some advice for integrating some parallel generators and a step-up transformer at an industrial plant. We have (4) 1MW generators which will be paralleled and backfeed a single 480-13.2 step-up transformer. This will feed a service rated MV ATS and pick up the entire plant...

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