Questions tagged [cables]

Questions about cable types, properties, ratings and construction.

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Cable modem connection [closed]

This is the current setup I have in my basement. Here is what the colours represent: Green: cable coming from an amplifier Red: cable connected to a cable modem Yellow: cable connecting the 1-way-tap ...
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2 answers
43 views

HDMI: Can a computer still detect a monitor properly if some of the TDMS pins/wires are damaged? [closed]

Can a faulty HDMI-cable with damaged TDMS pins/wires still work to the extent that the computer can still detect the monitor, but the monitor just will not display anything (except for no signal)?
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1 answer
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What are these notches in an FPC for?

We are given these cute LCD displays (China made of course, drawing here on page 4.) There is a pair of notches on the connecting FPC. They are not next to the contacts (I've seen some connector ...
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2 answers
44 views

Make a cable go into a water container without any leaks

This might not be the best place to post this, so if I'm in the wrong, please let me know. I have a water container that I want to put a temperature probe into, but I can't drill a hole from the top ...
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0 answers
26 views

Voltage Drop Formula for Three Phase Power Systems

I've just started learning about electricity and power systems, and am currently learning about calculating voltage drop for three phase power systems. The book I am reading is explaining how to ...
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10 votes
4 answers
3k views

Why does the current carrying capability of a cable increase with temperature

I'm specifying cable for a VFD application and came across this table regarding NEC ampacities and corresponding cable size. What I found interesting is that the ampacity increased with temperature ...
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1 answer
37 views

What are relationship between cable properties and electrical properties?

I was prototyping esp32-cam (microcontroller aka MCU) on breadboard, I saw brownout error message on serial monitor everytime I initialize WiFi then it keeps restarting. After I google for 24 hours ...
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2 answers
81 views

How do I connect the phone cable in the breadboard

I am making a wireless phone charger, and everything works, but I don’t know how to connect my cable to the receiver circuit. My cable has 4 terminals, and my receiver circuit is similar to this one.
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1 answer
81 views

Sizing of high voltage electric vehicle cables [closed]

I would like to know how to find the wire cross sectional area (mm^2) for high voltage cables for electric vehicles. I also would like to know how to choose the number of strands. System voltage is ...
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0 votes
1 answer
57 views

Addressable LEDs (WS2815): power and data in a multicore cable

Would it be possible to use a multi-core cable to have power and data in the same wire? I'm using WS2815 LEDs. The total current needed is 9.6A. For a cable of 8 meters, a 2.5mm wire is needed. ...
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1 answer
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What does it mean to assign a conductor?

I am reading about SATA power here. They say the following: The power cables for the SATA interface are of similar construction as the signal cables, but have 15 conductors. They supply power to the ...
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35 views

MV grid topology?

In the vast majority of cases, a resonant grid (compensation with Petersen coil) is adopted in MV grids. Grid capacitance is compensated by the inductive component of the Petersen coil. Since cables ...
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1 vote
1 answer
78 views

How can I select a suitable cable with these characteristics: 690 V, 550 A, 1 km long, AC three phase underwater cable

How can I select a suitable cable with this characteristics: The cable is connected at one end to a 690 V power generator that is between 6 and 40 meter below the surface of a big river and converts ...
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-1 votes
2 answers
66 views

Why do some cables have these cylinders? [duplicate]

Maybe this community is not the right one for this question, but I was curious why some cable have these cylindrical parts (like the one in the photo.) What are they and what is their purpose?
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Could my choice of cable be why my DS18B20 sensor isn't found?

I'm building a project with the DS18B20 temperature sensor and a Raspberry Pi (among other things) This temperature sensor needs to be a little distance from my Pi as it is an weatherproof external ...
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17 votes
3 answers
2k views

What does an EV "wall socket charging cable" do?

Known as "Mode 2 charging", this method of charging electric vehicles describes the use of a common household wall socket and common mains voltage (230 v) to charge the vehicle. This is ...
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1 answer
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How would you know if you could read/write from a port in any electronic device? [closed]

It's probably not the right forum to ask but this was the best one I could think of. If you know of a better forum let me know. Maybe raspberry pi or Arduino? It's very long winded what I'm trying to ...
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3 answers
92 views

Single phase induction motor does not start with long cable

I bought a single phase induction motor to build a mortar pump, the motor needs to be operated far from the power source (home construction site). The motor does not start when connected to mains ...
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0 votes
3 answers
121 views

What effect does a splitting an audio signal using a y-cable have on that audio signal?

Given a clean instrument-level audio signal of reasonable amplitude passing from point A to point B via a TR/unbalanced cable, what effect would replacing that cable with a TR to dual TR cable running ...
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2 votes
1 answer
38 views

Is there a standard for specifying the direction of a right angle wired connector?

When using connectors on wires (e.g. USB cables), there are four potential directions the wire can face relative to the connector: (image snipped from https://www.newnex.com/usb-right-angle-cables....
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11 votes
3 answers
1k views

Why do UTP pairs need different pitches?

Why do unshielded twisted pair cables need a different pitch/twist rate for every pair of wires in a cable? Most of my reading on UTP says that the pairs in a cable must have different pitch or else ...
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1 answer
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What AC cable coloring schema has brown, red, and green cables?

I would like to replace the power cable (marked with orange circle) of an old electric radiator made in Czechoslovakia some 40 years ago. The new cable I bought has the standard blue, brown, and ...
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2 votes
4 answers
305 views

Connecting thick cables to small terminal

I am currently installing an (off-grid, battery based) PV system for 5kWp at 48V (resulting in ~100A DC). In order to keep the system extensible in the future (don't want to reinstall cables because ...
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1 vote
1 answer
76 views

USB-C used only as analog tranmission line and not as intended?

For a side project I was planning on using a connector with about 20 lines/pins and as small as possible. The USB-C popped into my mind since it contains many lines (24), it's very cheap nowadays and ...
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0 votes
1 answer
123 views

Cable dimension for different loads

I have 40 loads connected to the same power supply. If every load draws 0.5 A in current and all of them 20 A. According to this I need cable dimension of 2.5 mm² for the main cable and then 1.5 mm² ...
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2 answers
69 views

How do I identify this 30 pin connector on split keyboard?

I have a split keyboard (Goldtouch sk2730). The cable connecting the two halfs is a little short for my purposes. I open up one side of the split and see this: What is the name of this connector and ...
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  • 111
1 vote
0 answers
95 views

Identifying a communication protocol found on a RJ14 cable

I have a LED panel controller that can daisy chain with an another led panel controllers using a RJ14 cable to adjust a PWM that dims the panel. This is what I see on the RJ14 pins. A periodic signal ...
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2 votes
2 answers
55 views

Splitting CB Radio Mic Inputs?

I just purchased my first CB radio and I am looking to split the microphone's output such that it can go to two outputs (the radio itself and custom electronics I plan to design). I'm using the Uniden ...
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1 vote
1 answer
61 views

What type of wires are used inside a USB 3.0?

In a USB 3.0 cable, there are 9 different wires used. In the same, suppose we take the two differential pair wires (TX, RX) are used, which are in the range of 26-34 gauge. But I need to know what ...
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2 votes
1 answer
99 views

CCTV cable power rating?

I want to know whether I can use this d-link 3+1 CCTV cable for powering an led strip which runs at 12 volts 1 amp. The led strip is approximately 12 meters away from the smps power adapter. I checked ...
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0 votes
2 answers
215 views

In AC/DC adapters, why can't the DC cable be detached from the adapter? [closed]

I notice that in most (all?) AC/DC adapters, the DC cable can't be detached from the adapter. Is there a reason for that? Example: Note: The question is not opinion-based, since the existing answers ...
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2 votes
6 answers
2k views

Twisting two cables: Does the rotation of each cable play any role?

When twisting two cables (imagine f.e. something like a twisted pair cable), does the rotation of both cables have any importance? I.e., is it important that each cable rotates around its own axis as ...
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0 votes
1 answer
76 views

Correct way to attach a power cable to this kind of female plug?

I am trying to figure out how to connect AWG16 power cables to the plug shown in the picture. The plug will be a power source (220V 10A) in a plastic enclosure. Can I just insert the cables into the ...
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0 votes
0 answers
69 views

Can 23/76 wire handle 12V 6A power? I have looked at several tables but cannot find answer

There is nowhere which concretely tells me if 23/76 is sufficient for 12 V 6 amps power. Is it okay to use 23/76 wire for 12 V 6 A?
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0 votes
1 answer
86 views

Cable shield connection: ground or earth

I have an analog sensor which features 3 wires: power supply +, ground (common for supply and signal output) and signal output iself. Sensor is working in industrial environment. I am using shielded ...
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1 answer
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Any idea if a 2/0 3C teck cable will have fitment issues through a 1-1/2" Metal LB?

I need to feed a 45 kVA transformer and I need to use an LB to pull the conductors through. Will I have issues with the bend radius of the 2/0 conductors? It's a 3C cable. the conduit is 1-1/2" ...
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0 votes
1 answer
62 views

Are T568A/T568B Cables Compatible with USOC Cables?

Is it a good idea to use a USOC cable in the same network as a T568A/T568B cable? I can't seem to find anything about this on the web.
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1 vote
3 answers
108 views

Cable Shielding for Non-Isolated Differential Signals

If I am transferring data from one device to another using a non-isolated differential signaling standard like LVDS or RS-422 through a cable, and each device has its own single-point ground, should I ...
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1 vote
2 answers
111 views

USB A-B cable without Vcc [closed]

I build a lot of my own devices, using a USB interface. Many are self-powered, using either an on-board PSU (Power Supply Unit) module (linear or switching), or an off-board 5V PSU (or however many ...
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0 votes
1 answer
35 views

single core vs multicore LV power cables

For a three-phase UPS system of 400 V, disregarding the cost, is it better to install for 3 phases plus 1 neutral plus 1 ground five single-core cables. One 3-C cable plus two cables each is 1-C. ...
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1 vote
1 answer
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Is low humidity bad for HIPOT testing electrical harnesses?

From what I understand for HIPOT testing high humidity could be a potential issue because if cable insulators absorb moisture that could affect their resistance. What about low humidity? Is there any ...
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4 votes
2 answers
983 views

Why don't oscilloscope probes use twisted pairs?

I was reading online about how Ethernet cables use twisted pairs instead of coaxial cables because it's better in some way. Some websites say that twisted pairs cost less, can carry higher frequencies,...
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0 votes
3 answers
33 views

Specification for RJ-14 connectors and 4-wire flat cable?

RJ-14 jack and plug should have some kind of standard to make sure that the parts from different manufacturers fit together, but I have not been able to find such information. Can someone help to find ...
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2 votes
0 answers
57 views

How to choose the right flexible cable for moving parts?

Is there a generally accepted guide to select a cable, which has to withstand certain bending stress? I am looking for something like this: ...
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0 votes
2 answers
72 views

Ethernet RJ45 M-F cable (socket <-> plug)

During renovation I've asked the electrician to use two long patch cables originally running from my router to create RJ45 sockets with the intent to later connect the router to the socket using a ...
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0 votes
1 answer
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Does a certain cable arrangement that reduces the generated magnetic field improve shielding properties as well?

If I arrange a three phase cable via phase-split into an arrangement that reduces the generated magentic field, does this affect shielding properties as well? To reduce the generated magnetic field of ...
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-1 votes
1 answer
80 views

Does Multisim have coaxial cable? What simulation application can I use that has coaxial cable?

I want to use coaxial cable in a simulation. Is it available in Multisim or another simulation program?
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1 vote
0 answers
50 views

Calculating voltage and current of constant wattage loads along a very long cable

I am struggling with a calculation where I'm either missing something really simple or the maths is advanced beyond my current capability. I have tried rearranging wattage / ohms law calculations but ...
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2 votes
2 answers
119 views

BNC and SMA cable testing

Are there tools for checking (or that could be adapted to check) if BNC or SMA coaxial cables are in spec for things like proper shielding, impedance (across their bandwidth), etc.? I've found lots of ...
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21 votes
7 answers
4k views

Is it bad practice to parallel power connector contacts?

Say I'm looking for some power connectors for a design, the current requirements are quite high and although I could get a connector with contacts rated for the full current, they're so bulky that ...
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