Questions tagged [cables]

Questions about cable types, properties, ratings and construction.

98 questions with no upvoted or accepted answers
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63 views

What determines the voltage rating of a cable?

I'm trying to figure out the maximum voltage of some cables in a vacuum system I've inherited, and I'm confused by the DC voltage ratings given by this supplier as they step from the 3 kV to 10 kV ...
3
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1answer
1k views

Maximum length of high-speed LVDS cable in automotive environment versus using SerDes

I would like to connect a small TFT display that uses LVDS, 4 channels for data and 1 channel for clock. Data rate is maximum 200 Mbps per lane. Very strict EMC requirements are applicable, namely ...
3
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2answers
122 views

Spiral hoar frost and spiral device around telephone or electric landlines

I live in Germany. When I travel by train, sometimes there are cables that run from pole to pole parallel to the train track. From the lack of insulation between wire and pole, I guess these are ...
2
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0answers
761 views

Wiring problem while making couple of USB Type-C cables

1. USB TYPE-C to USB 2.0 Standard-A Cable Found this TYPE-C connector parts w/ 56k resistor from taobao, but there is no detailed circuit diagram on it. I want to make USB TYPE-C(device) to USB 2.0 ...
2
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2answers
106 views

Figuring out ground in AC circuit

I'm currently trying to change my lamp in my bathroom so I disconnected my current lamp and forgot to write down what the cables were attached to. There are 3 cables coming out from the ceiling. <...
2
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1answer
75 views

What are the relations between analog transmission frequency and multipair cable types?

My question is a little theoretical about multipair cables. I want to have some basic understanding about the relation between the multipair cable types and application frequency, length and and EMI ...
2
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1answer
77 views

Is it safe to use individual conductors removed from a multi-conductor cable?

I am working on setting up a research lab at a university as a graduate research assistant. We're working on power electronics in a three-phase environment, which means we'll be using at most five ...
1
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1answer
41 views

DVI Hot Plug Detect

I am making a custom cable from a VPX backplane to a DVI-I connector, and need to know if the DVI cable will work ok with a standard monitor if I do not wire up the hot plug detect pin. I will never ...
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0answers
32 views

What is the proper reference designator for a ring terminal in a cable drawing?

I am working on some cable drawings that utilizes ring terminals that connect on a relay terminal. Initially, I was using T as the reference designator for them, but I realized that is incorrect since ...
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0answers
43 views

Fiber optic transceiver for lower speeds

I am trying to figure out if a QSFP-DD transceiver can break out 8x 10G lanes if I make/use a 1:8 fiber optic breakout cable. It seems like most Transceivers are rated for one speed only, so if I get ...
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0answers
55 views

Cable Issues with USB HS

We’re working on a product that makes use of USB HS, and are having some connection and consistency issues. Originally, our product was USB FS-based and we had no connectivity issues; with this second ...
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0answers
39 views

Fiber Optical and 80Gbps MTP/MPO?

I am trying to get a cable solution to output 80Gbps of data. My FPGA is trying to input/output data. It has QSFP-DD cages. Fiber SFP+ cables (50um and multimode) need to interface to this. From my ...
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217 views

Why don't LG RS232 commands work when the TV is on (only responds when off)?

I'm writing a new question after stumbling across this question which appeared to have similar symptoms: LG RS232 Commands partially working. As the other question noted, the power on command ...
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0answers
52 views

Why do Electrical cables use the NY* naming convention?

I did some research on cables and found that most cable types are named like so: NYY/NYA/NYM. The weird part of this naming system is that its meaning does not match up with the abbreviations. For ...
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0answers
45 views

time domain reflectometry pulse

Today I investigated a cable which is around 900m long. I used a TDR that injects a needle pulse into the system with a width of around 40ns. The needle pulse had an amplitude of around 2V. A ...
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0answers
41 views

How does one properly strip coaxial cable to nonstandard strip lengths?

For my job, I need to put SHV connectors on a couple lengths of RG-59. I have the cable, the connector, and the crimping tool, but I've hit a snag: I don't have the slightest idea how to properly ...
1
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1answer
525 views

How can I remove the label from heat shrink tubing?

I want to use heat shrink tubing on the jacks of an instrument cable I'm making (like in the photo below). The problem is that the tubing I have has a label printed on the side with the size and such, ...
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0answers
34 views

Angel Eyes RGB LED Ring Light Wiring Extension

the cables aren't long enough and I want them to be black. Can anyone please tell me what this type of wire is called? It has four very small cores and runs on DC12V to supply power to four of these ...
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0answers
246 views

Use USB-C alternate mode pins for custom signals?

I am working on a product that is made of 2 parts: a host with a male USB-C connector and a device with a female USB-C connector that plugs onto it. The plan is to use USB-C because it's a nice ...
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0answers
284 views

Cable tray width selection as per NEC 392

I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
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1answer
284 views

Fixing the pins in a flex cable

This is a flex cable from a kindle that connects the motherboard to the lcd. The pins at the edge are broken and not making any contact with the connector. Is there any salvation for this? If there's ...
1
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1answer
89 views

Data + Power connector and cable suggestion

I need to decide about how to connect two custom designed electronic units. One is main (execution) unit, and the second is hand-controller unit. Those units have to be connected by wire. The ...
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0answers
103 views

Connecting CMOS sensor to (far away) PCB: understanding cable length

The problem is a bit complex due to the number of unknown parameters and my inexperience. I need a way to determine how far I can put the PCB from the sensor without problems in the transmission of ...
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0answers
156 views

Are the USB-C D+ and D- shorted to its duplicate pair pin?

Is the usb type C connector Data + and Data - are shorted to its pair on the opposite side? Are the Vbuses shorted to the other V buses? And does the question above still hold true/false if the cable ...
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0answers
66 views

What would you call a cable which combines both a coaxial transmission line and regular conductors?

I'm looking for a cable that can carry both dual supply (+5V and -5V at <100mA) DC power and a relatively high bandwidth analog signal. The intended application is powering the amplifier of an ...
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0answers
320 views

Twisted pair with shield and drain wire

Ive been posed with a problem regarding calculating the characteristic impedance of a shielded twisted pair with a drain wire. While I understand how to calculate this for a "normal" shielded twisted ...
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0answers
85 views

Simulating cable length during TDR testing

I am trying to create a circuit that can be used as part of a TDR simulator. What I need to know is if it is possible for the pulse that is sent out by the TDR equipment to be delayed by a piece of ...
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1answer
177 views

Replacing an old dart board ribbon connector - need advice

I hope this makes sense but I have an old dart board that is having some issues I believe is related to the cable in the link below. The cable is a ribbon cable I believe and toward the bottom there ...
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0answers
320 views

F type female to SMA male adapter impedance question

I have a coaxial cable that I need to connect to a SMA female connect. The impedance of the cable is 75 ohms, and from online the SMA female connect is 50 ohms. Online there are a few places that sell ...
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0answers
73 views

Cable Equations and/or Calculations

So, I'm on a placement as part of my final year of a Masters of Engineering Programme and the company have given me a task concerning a fault they may or may not have with one of their cables. ...
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0answers
203 views

How do I choose a twisted pair shielded cable?

The charging/discharging of a battery (1u to 30 mA) and remote voltage measurement is to be performed over 2 pairs of 2 m cable. In order to reduce picked up common mode noise I intend to use shielded ...
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0answers
146 views

Using a MCP23017 for detecting open door/window

I'm not a hardware guy. My plan is to read input states using an MCP23017 connected to a Raspberry PI. My doubt is about the switching circuit. My plan is to use Ethernet cable pairs to wire the ...
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0answers
60 views

What is the correct way (read "correct way according to the law") to choose the section of a power cable in the EU and UK?

I am wondering if there is a standard process across the EU in particular Germany, France and the UK, for choosing the the section of a power cable. Suppose that: the cable is to be installed in an ...
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0answers
4k views

Best heating cable for a DYI heating blanket

I want to make an electric/heating blanket that will work with heating electric cable. I will use a computer AC adapter that output 19V 3.16A, and this dimmer to regulate the heat and a heating ...
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0answers
37 views

Medium Voltage Cables

Concerning medium voltage cables, 12/20 kV, 50 Hz I would like to ask two questions 1)What is the difference between these two types of cables: N2XSY N2XS2Y As far I know the difference is the ...
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30 views

What does pole rating and bipole rating mean for HVDC transmission cables?

I was just reading on HVDC underground cables. And according to the picture below, as they were listing out the parameters of the cables used, they mentioned pole ratings and bipole ratings. How are ...
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19 views

Routing multiple video and power through one multicore cable

I currently have three cctv camera feeds each with a dedicated cable, I assume a 4 or 3 core of some layout (not sure if this is shielded or otherwise). Currently each cable has a dc pair end ...
0
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1answer
354 views

How to calculate power loss & voltage drop in three phase power cables

What is the correct formula/method to calculate cable power losses in a three phase system? i'm unable to find any IEC standard outlining the same. If you consider 3C/4C cables, the manufacturer ...
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0answers
35 views

Raspberry Pi : White/Blank screen with new shielded cable

I'm currently passing EMC tests at a test lab. For the purpose of the tests, I made a custom DSI cable for the official Raspberry Pi 7" screen with shield against EMI as the PCB of the official ...
0
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1answer
57 views

USB-C to USB-A to Micro for charging

The project is to add 2 USB-A ports to my bass amp so I can charge my device(s) during a gig. To do that, I bought a 2-port USB panel mount connector (intended to connect to a motherboard) and a 2-...
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0answers
57 views

Name of a single-conductor coax test cable

Alright, bit of a silly question but I can't seem to get Digikey or Mouser to show me what I want. I'm wanting to replicate Fig. 7 of this INA116 datasheet almost exactly. Before I go and buy this ...
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0answers
43 views

Detecting a high-resistance fault location (like corrosion)

I recently encountered a problem where i had a 2 wire cable, one wire with corrosion somewhere and the other wire is perfectly fine. I didn't have a replacement so I wanted to try and find out where ...
0
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1answer
45 views

Testing cable continuity while protecting from overvoltages

I have a circuit that tests the continuity of all the wires in an A-B USB cable, by plugging both ends of the cable in female connectors on the PCB. It is operated by a 3V3 tolerant MCU. That creates ...
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0answers
28 views

help identify USB-like charging cable/connector (used in headphones)

I need help in identifying the type/name for this cable and input pair. I've been able to rule out existing cables that I already own and that I could determine online. I used several sites that list ...
0
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1answer
80 views

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration?

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration [Henry W. Ott, (1988), Noise Reduction Techniques in Electronic Systems, 2 Ed., AT&...
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52 views

How to use USB 3.0 inner cables by color?

I have an USB 3.0 cable I want to use only for powering a basic circuit with 5V and the max current I can get from USB 3.0. Once cut, I can see these cables : I know the red and black are power and ...
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1answer
64 views

Op amp current noise reduced by putting pressure on signal cable

I have a ribbon cable that is carrying four signals (each about 5V in amplitude and 1-2 Hz) and a ground wire between a DAC and four op amps. The op amp outputs are amplifying the signals to 30 V and ...
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0answers
22 views

IEC60950: cable distribution network definition

The definition of a cable distribution network is given in IEC60950: "mainly intended for transmission of video and/or audio signals between separate buildings or between outdoor antennas and ...
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0answers
34 views

Wiring Stepper Motor / Placement of Stepper Motor Driver

I'm making a CNC-like machine and I'm in the process of designing PCBs for the head assembly. Currently I have stepper motor driver (with 100uF caps on the power line) on the head assembly and I'm ...
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0answers
44 views

Running cables through drainage, what is the best cable to use?

I have a project where we have been provided with cable routing through the water drainage and will therefore need to be suitably protected from being submerged in water fairly frequently. What are ...