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  • Users: DM2
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  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

    ...valve (or something similar) have a tag of "SOV"? We've been asked to us "AT" for gas detectors in the past. In looking at Table 5.2.1, the "(*)" [bubble subscript?) would seem to provide the solution to "What is the target gas for the sensor?". Table 5.2.5, seem to suggest that a gas...
  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...
  16. DM2

    How to handle momentary High Current on 120 VAC Circuit

    I've read a number of recommendations not to connect a Laser printer to a UPS (CyberPower - Can I connect My UPS to a Laser Printer as it can damage the UPS. itsmoked - I did connect a clamp meter to the circuit at the breaker which is how I determined the load with and without the printer...
  17. DM2

    How to handle momentary High Current on 120 VAC Circuit

    3DDave There are other things on the circuit (2 lighting Circuits, several outlets with nothing plugged in, and a ceiling fan). I've resorted to turning those off when I start the printer. I measured the load using a Clamp Meter and the all the circuits off...then again with the printer...
  18. DM2

    How to handle momentary High Current on 120 VAC Circuit

    I have a copy/printer (Konica Bizhub C220) that I got during COVID to be able to work from the house. I needed something to print in color and scan 11 x 17 drawings. The unit is plugged into a wall outlet. The wiring to the breaker will support 20 Amps, but the original breaker was a 15 Amp...
  19. DM2

    MS Project 2016, Delete Image in Header

    I was playing around with inserting a company logo into the header of MS Project 2016. This feature isn't as handy in Project, as it is in Excel, which allows you to scale the image. The image I inserted is the same that i've inserted in Excel, with ends up being about 7" wide by about 2"...
  20. DM2

    oscilloscope Training, Introducing errors intentionally

    First, thanks for everyone's input. I’m a mechanical engineer so forgive my ignorance on some of the comments. Most of what I Google on the Internet is about making communications circuits bullet proof, when what I want to do is break them. Catserveng… So you took the wire from the Varac and...

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