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  • Users: RAndres
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  1. RAndres

    Specing a Disconnect per NFPA 79

    I need to call out a disconnect for a 480V 3 phase enclosure. I've been reading my way through NFPA 79, but have some questions. The device will be moved to different plants, not just within a plant. In other words, I don't know what the supply short circuit and fault currents could be. That...
  2. RAndres

    Manual Pick & Place assist devices, and how to select one

    I'm considering picking up one of those desktop pick and place assist devices. Usually a set of slides that allow an operator to move their hand over the pcb without disturbing previously placed parts and solder, along with a vacuum pick up to get parts and precisely place them. They often offer...
  3. RAndres

    Creating documentation for control cabinets

    I'm working on a project which will require a custom control cabinet. Power supplies, disconnects, fuses, several assorted controllers, etc... I've seen and used documentation for this kind of cabinet in the past, but haven't had to build and document to date. Sadly, I don't have access to the...
  4. RAndres

    How to crimp to NiChrome spiral wire with glass fiber core

    I've got a requirement to crimp to a spiral heating wire. It's a NiChrome resistance heating element, which is wound as a spiral around a core of glass fibers. It's covered with a layer of foam rubber like insulation, and then with a woven fiberglass covering. My understanding is that NiChrome...
  5. RAndres

    Difficult connectivity issue

    I've got a tough connectivity issue. I need to place a BGA with ~100 balls on a round PCB. The board is not much larger than the footprint. It's about 0.1 inch larger radius than the minimum possible given the inscribed rectangular part. The part is .340 x .245 inch. I need to bring about 20...

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