Questions tagged [chassis]

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What are the drawbacks of connecting circuit GND and Chassis via multiple mounting screws (for EMC and Safety)?

Although there are various suggestions around for how to connect circuit GND to the earthed chassis (say, the chassis has a point-to-point resistance of around 1 mΩ) in devices, there seem to be two ...
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When does a PCB require a chassis ground connection?

Do all PCBs require a chassis ground connection point? I am designing a circuit board which will be used in many different types of assemblies. It is a small mixed-signal, low-voltage (24 VDC power, ...
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2 votes
0 answers
42 views

Wire guage to connect to chassis in van

I'm building an AC electrical system for my van conversion and I'd like to know if there's a minimum wire gauge I should use to connect my negative bus bar to my van's chassis. Specs: I'm running a ...
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0 votes
2 answers
75 views

Do automobile DC systems sport a device synonymous to the electrical infrastructure that we call Earth Ground wiring in standard household AC systems?

In automobile DC circuits, the chassis is typically connected to the negative battery terminal and, thus, the chassis provides the infrastructure for closing the DC circuit. In diagrams, this is often ...
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3 votes
2 answers
412 views

Old Variac -- chassis ground? is it safe?

I've got an old (vintage!) GenRad Variac (below) that has two prong plug and two prong socket. I want to modify it to add a safety earth pin to both input and output. In doing so, I opened it up and ...
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0 votes
1 answer
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ESD protection to the ground or chassis?

How to add ESD protection diodes to all cables (I/O, positive, ground)(see pink box below). Should I connect them to the chassis or battery negative terminal? There may be some potential difference in ...
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2 votes
1 answer
358 views

How is Chassis ground connection implemented for an input cable with TVS diode protection?

I believe my question is different enough in specifics to Is it better to connect ESD (TVS) Diodes to chassis ground or signal ground? to warrant a new question. According to Electromagnetic ...
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1 vote
3 answers
213 views

Grounding a chassis with two prong plug

So I kinda shot myself in the foot by purchasing a two prong wall wart to power an audio preamplifier that I designed. I forgot to consider the fact that I should ground my chassis to the earth ...
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5 votes
1 answer
1k views

Is it better to connect ESD (TVS) Diodes to chassis ground or signal ground?

Application: We have a PCBA inside a vehicle's embedded system. The PCBA receives DC voltages from a power input connector. We do have access to signal ground aka 5V_return at the power connector and ...
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2 votes
1 answer
194 views

Right way to couple DGND to Chassis ground

So we all know certain things: DGND (and subsequently AGND) needs to be coupled to Chassis ground, or Earth at one position, at least, in a device. The Earth is otherwise considered as a hazardous ...
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6 votes
2 answers
949 views

Connection between Chassis GND and Circuit GND for ESD/transients

All of the images in this post are from Henry Ott's Book, Electromagnetic Compatibility 2009, and I would like some clarification on some things about them. Figure 14-14 seem to be in conflict with ...
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1 vote
1 answer
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Plane Chassis Grounding

I'm having a hard time understanding Chassis Grounding. From my understanding, the frame of a plane is used for that and all of it can return to the batterie. Given my understanding, it remains a ...
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2 votes
2 answers
452 views

How do you avoid mixing CHASSIS GND and sensor GND when reading a sensor?

So I'm aware that in some systems they have different circuits with different grounds. For example, cars have at least a chassis ground and a sensor ground, and there is a measurable difference ...
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1 answer
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Is there a colour standard for mains 'signal' wiring?

Hello I am currently wiring a mains powered chassis. I have relays which use mains voltage levels for controlling other mains voltage relays. I would like to differentiate between the signals by using ...
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1 vote
1 answer
5k views

Proper Chassis Grounding

I'm starting to design things that run off mains voltage and I want to be sure that I have a proper connection from my chassis to earth ground. I've been reading a bit about proper grounding and have ...
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0 votes
2 answers
284 views

DMX chassis(?) pin?

I want to recreate this circuit (only show a small relevant portion): And my XLR plug for input (K2) looks like this: I found a reference how to connect K2, +, - and GND to the correct pins of the ...
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6 votes
3 answers
2k views

RS 485 ground signal and chassis

I have a shielded twisted pair running from one device polling several devices in an RS 485 loop. The conditions: The devices are in parallel as they should be. The termination resistors are in ...
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0 votes
2 answers
555 views

does the 24 Vdc supplied circuits with metal chassis needs to be grounded to earth?

I used put some electronic circuits together in a plastic box, with a DC power jack attached to the box for a 24V dc supply to my circuit. Everything works fine. However i now plan to put all the ...
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1 vote
1 answer
2k views

Chassis punches for IEC C13 sockets?

I can't believe I'm having trouble finding chassis punches for the IEC C13 socket. This has to be the most common way of getting 120VAC into a box, yet I can't find any chassis punches. How do most ...
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2 votes
3 answers
922 views

Using Chassis as a conductor for DC Power Supply Return

Is it considered a good practice to use the chassis as a return path to a DC Power Supply? I have been given a rack mounted device that switches 480 volt power on/off remotely. The remote feature is ...
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2 answers
299 views

DC Power Jack - minus to chassis?

Is it OK to connect the minus from a DC Power supply, 15v 4A (switched) to a metal chassi as ground? No electronics will be connected to the chassi. The jacks that I have found seems to be made of ...
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0 votes
1 answer
512 views

SMPS output grounding (PE)

I am designing an ultralow noise 5V/3A SMPS. On the DC side, I see the ground (DC) is earthed (chassis ground) using a direct connection 0 ohm or using a Y capacitor. What are the differences between ...
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1 answer
2k views

SMPS chassis ground and earth ground

I'm designing a ultra low noise smps and I have some questions about ground/earth chassis. The main goal is very low noise on DC output. Earth (PE) should be connected to one point (only) to the ...
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1 vote
2 answers
775 views

What are these "X"s / crosses on this schematic's wiring? Traces attached to the metal housing (ground)?

Below is a section of the schematic for the RF modulator of a Nintendo NES-001 system. I am curious what these Xs are that I've boxed in red below. Looking at my own NES-001 and matching locations, I ...
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1 vote
2 answers
3k views

circuit ground vs chassis ground

Can someone briefly explain what's the point of separating circuit ground from chassis ground with a capacitor + resistor?
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1 vote
3 answers
3k views

What could happen if a lightning strikes a car with a battery connected to the chassis ?

I was wondering today what could possibly happen if a lightning strikes my van where I have a 12V battery negative connected to the chassis. Could that destroy the battery or start a fire? In order ...
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4 votes
1 answer
1k views

ESD Protection on Un-grounded Chasis

I am designing a product solution which needs a 240V AC to 12V DC. I am getting that done with one of those standard laptop chargers from a reliable OEM(with necessary certifications) which looks like ...
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1 answer
2k views

Chassis grounding short circuit

if the chassis of a DC power supply is earth grounded , and lets say I am messing around with my power supply and I touch the positive voltage perhaps through a jumper wire or a component on a ...
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0 votes
1 answer
155 views

If current flows through lowest resistance path, why circuits with grounding still work?

Okay, this may sound stupid. Current (conventionally) flows from the positive to the negative terminal of a source. This also means that the source's negative terminal is on lower potential than the ...
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1 vote
1 answer
685 views

Why not connect battery negative to chassis?

I am making a mobile robot with a metallic chassis. Usually, a non-moving appliance will have the ground pin of the wall socket connected to the chassis, but in a moving device, there is only the ...
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1 vote
2 answers
444 views

What are these kinds of pins called?

What are these connectors at the edge of the chassis called? I thought they were pogo pins, but it seems like they're not uniform and are keyed? How well do these kinds of connectors stand up to ...
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2 votes
4 answers
3k views

Difference Between - (Minus Sign) and Chassis Ground in Schematics

I was working on building some projects from the book Electronic Projects for Musicians and I noticed that in most of the schematics there are two symbols for what seems to be ground. One is a - (...
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1 answer
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Extra 2 DB9 pins connection

Many DB9 symbols have 2 additional pins other than the 9 signal and GND pins that they are known for. How and to what are these 2 pins connected ? Pins 10 and 11. Is it connected to chassis ground or ...
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0 votes
1 answer
154 views

chassis ground and its location wrt common mode currents

This is related to chassis ground. The chassis ground is connected to the system ground at the entrance of the cable that brings in signals and not at the other extreme or opposite end of the PCB. ...
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2 votes
2 answers
7k views

Chassis ground on Ethernet RJ45 Connector

In the reference schematic of an Ethernet transceiver, I noticed that the chassis ground is connected to system GND by 1nF/2kV Capacktor(C24). What is the purpose of doing this? The connector(...
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0 votes
1 answer
339 views

Basic questions about chassis grounding

I am uncomfortable with the notion of chassis ground but I can't pin down what exactly bugs me. So I'll start with an example and ask a couple of questions on the way. My background is this: I have ...
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11 votes
2 answers
6k views

Why are some mounting holes connected to ground?

Why are plated mounting holes connected to ground ? I read that if you are connecting your board to chassis ground, then it should be connected at only one point and connecting say 4 mounting holes ...
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3 votes
1 answer
6k views

Grounding the chassis with capacitor

My question involves chassis grounding to earth ground. My PCB circuit is a simple signal generator using a microcontroller. It has a separate 'ground' from earth ground, supplied by a floating 5VDC ...
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1 vote
1 answer
2k views

Grounding in a DC circuit on a vehicle

I am working on a vehicle with batteries, but i am not quite sure if my grounding solution/design is correct. It is supplied with two 12VDC batteries in series, connected to a DC-DC (24VDC-24VDC) ...
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10 votes
3 answers
1k views

What do I do with the extra "ground chassis" tab on a DC power jack?

Product Link Datasheet I have about fifteen 9v wall warts within specs for the circuit; I'm going to use the one that fits the jack. There are three solder tabs on the jack. One for the positive tip,...
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  • 3,352
123 votes
6 answers
57k views

Should chassis ground be attached to digital ground?

I'm working on a PCB that has shielded RJ45 (ethernet), RS232, and USB connectors, and is powered by a 12V AC/DC brick power adapter (I do the 5V and 3.3V step down on board). The entire design is ...
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  • 1,563
6 votes
2 answers
3k views

Chassis + Ground Safety

Why is it safer for ground to be connected to the chassis for an electronic system? For example, the ground on the mains supply of an AC motor in a box fan is connected to the outer chassis of the ...
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