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...
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...
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...
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...
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...
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"...
I want to train some technicians on the use of an Oscilloscope for trouble shooting electrical interference on communication circuits. I'd like them to see real world examples of what noise looks like and what capacitance does to the communication signal. The communications circuit would be...
IEC 60890 uses a series of graphs as part of the temperature rise calculations. I've been looking for either a spreadsheet, or equation to incorporate into the calculations rather than a graph.
Anyone know of a spreadsheet, or the equations used to plot the graphs?
Regards,
DM
"Real world...
I've been doing some reading on Peukert's exponent but I'm still confused. I'm familiar with sizing a battery bank based on the system load, but in my current application, I want to make sure that at the end of 24 hours, the batteries are lower than "X" volts. My reason for this is that...
The NEC allows the use of a resistor (i.e. and end of line resistor for a fire alarm circuit) to be installed on terminals in a field mounted device certified as “nonincendive” (a Federal Signal Strobe for example) provided the temperature of the resistor doesn’t exceed the temperature rating of...
I did some searching in various user forms here but didn't see any posts that address my needs.
I'm looking for a program that will convert a STEP file to DWG or DXF. Autodesk used to have a program (I think it was "Inventor Fusion") that I used, but since I've upgraded my PC I can't find the...
A number of fire panel manufactures have had their equipment tested for OSHPD seismic certification per-approval. In discussions with one manufacture, I was told that if the equipment weighs less than X pounds (20 lbs is what the person thought the value was), seismic calculations aren't...
OSHA now recognizes both the ISA and UL 60079 series of standards for product safety testing (see OSHA Appropriate Test Standards)of equipment intended to be installed in hazardous locations.
While I suspect they’re identical, I’m not sure and I’d rather not invest +$3,000 for the UL set and...
Does anyone have an old Relay Logic Diagram they would be willing to share. I'm doing a seminar that lightly addresses programming languages, and wanted to show an old relay logic diagram. All I'm coming across is what is out there for PLC software and I'm looking for something old school...
There seems to be an unwritten rule that when assigning subscript for mathematical symbols, the Noun is capitalized and the prenoun is subscript. For example: Potential Energy is often written Ep, rather than Pe.
I've not seen this written in any "Style Manuals" that I can find. Is my...
Does anyone have a good reference for a book with good engineering formals for Excel 2010?
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."
I'm doing some research and in one of the papers I'm reading, there is a reference to information authored by "Babrauskas" which states:
The reference states that this information is in the 16th edition of the NFPA Fire Protection Handbook. I have both the 19th and 20th edition in PDF format...
I'm doing some research that involves digital processing of video images. There is a statement in one manufacturers patent (US 6184792) which states:
I attempted to Google the term, but with little luck. I did find a PDF publication on the web titled [link...
Is there a standard (military or otherwise) for the construction of a serial cable or more accurately, how to terminate the cable at each end?. Something on RS232 or RS485?
I've been working on a technical document for panel assembly. The panels are based on PLC's. While most of the assembly...
I'm trying to determine what the temperature rise will be of a 1 cu. ft. of air, moving at 2640 CFM, when exposed to a flame emitting 3000 BTU's. The volume of air is introduced at standard pressure and at 100°F.
The situation is this:
I have an open flame that was calculated to have an output...
