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Recent content by DM2

  1. DM2

    Electronically controlled watermist systems

    Yes..., they're not new however...
  2. DM2

    SAE (or other) standard for 12 Volt Battery Connections

    3DDave...I've asked "InterState" batteries and PowerSonic...no dice. I'm now emailing "customersales@sae.org"
  3. DM2

    SAE (or other) standard for 12 Volt Battery Connections

    I'm trying to figure out what SAE standard addresses the connectors on 12 Volt Batteries. I believe Japan (JIS) also has a similar standard and ISO most likely has a standard. The image below can be found on a number of battery supplier web sites. I've got to believe this comes from an SAE...
  4. DM2

    Clean Agent System

    With regard to IG-541, I don't know of a manufacture that has difference design concentrations than another. There are differences between different voltages for Class C hazards however. I'd be interested in the manufacturers you're comparing and where you're getting your references...
  5. DM2

    Wall Strength for Metal Stud Wall

    Ron, Thanks for the input. I don't want to provide too many assumptions since the selection of the Stud is something they'll need to do... I think I'll look for s stud manufacture and see what they might suggest for this... Thanks again.
  6. DM2

    Wall Strength for Metal Stud Wall

    I'm trying to point someone in the right direction. The issue is that a fire suppression system that discharges a gas into a data center needs pressure relief venting above the 5 psf referenced by the IBC section 1607.15. We're being asked to calculate the venting requirements at different...
  7. DM2

    ISA 5.1 Tagging Convention

    GBTorpenhow...thanks for your response. ASH actually comes from API RP 14C, Table 1. Oddly enough API RP 14C, section 4.2 is their support of the use for "S" as "Safety". As you surmised, the gas detectors do return the %LEL or PPM as an analog value but gas detectors can be purchased with...
  8. DM2

    ISA 5.1 Tagging Convention

    DM2 (Mechanical)(OP)25 Jan 24 00:09 I'm trying to understand ISA 5.1, Table 4.1 as it might apply to a Gas Detector. Normally I see a gas detector tags as "ASH..." I've been told that the "S" is for "Safety" and the "H" is for High. Table 4.1, "A" Column 1 is = Analysis (4-20mA...
  9. DM2

    NEMA Enclosure Requirements for Spaces Protected by Fire Sprinkler Systems

    The NEC has requirements for electrical installations in normally "Damp" or "Wet" locations. I'm trying to find out if NFPA 13 would require a space, that's normally not considered Damp or Wet (i.e. indoor) to use Weatherproof enclosures. The system being installed is a watermist system per...
  10. DM2

    Problem Connecting with MODSCAN64 via TCP/IP

    I'm trying to figure out what, when I connect to a device to read Modbus data over TCP/IP, Moscan64 always shuts down. It's been a while since I connected to a PLC via MODSCAN64 via TCP/IP, but as I remember when using MODSCAN32, I would first Identify the IP address of the PLC, and set my...
  11. DM2

    How to handle momentary High Current on 120 VAC Circuit

    sorry for the late reply...These days when you order something on Amazon, you tend to think it will be here in a day or so. I ordered the breaker and it took 3 weeks to get to me. I could have gotten it from our companies electric supplier, but they wanted $30+ dollars and Amazon was $13. In...
  12. DM2

    Consequences of Ground Fault on a Floating 24 VDC Power Supply (Fire Alarm Panels)

    Keith, Thanks for your input...appreciated. Regards, DM "Real world Knowledge isn't dropped from a parachute in the sky but rather acquired in tiny increments from a variety of sources including panic and curiosity."
  13. DM2

    Consequences of Ground Fault on a Floating 24 VDC Power Supply (Fire Alarm Panels)

    Steve...that's not answering my question. I'm wanting to know what could happen if you didn't have the indication that the panel had a ground. As I understand it, a single ground may not be an issue, but multiple grounds could cause problem. Essentially...what's the justification for...
  14. DM2

    Consequences of Ground Fault on a Floating 24 VDC Power Supply (Fire Alarm Panels)

    I'm trying to better understand the potential consequences of a ground fault on a 24 VDC floating power supply, similar to that used for a fire alarm panel. In my mind I'm guessing that if the circuit is grounded (and lets say your ground fault detection isn't working) there is the potential...
  15. DM2

    How to handle momentary High Current on 120 VAC Circuit

    Itsmoked...thanks for your response... I searched Home Depot and the website says there are none in my locations. I could go to the company we buy our electrical stuff from, but I ended up ordering it on Amazon and it will be here on Tuesday. In terms of Name Brand GFIC's, I would agree. When...
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