Re: [PSES] Chamber grounding [General Use]

I agree that (national) legislation should play a role here, but EMC chambers are NOT ordinary equipments, nor part of a standard electrical installation. I would not rely on electrical codes to create a safe work environment, and have my personal opinions prevail. We operate in a gray area,

[PSES] Optical Viewing Product

I just bought a supply of paper/plastic solar eclipse “glasses” for the upcoming USA total solar eclipse (I’ll be in the desert in Idaho, hoping for clear skies). I thought you might be interested in the product markings on this product. [CE & ISO marks] Conforms to and meets the

Re: [PSES] Solar electric cars built by college students

I'm not convinced that 'equipotential bonding' is the right solution. The first question to ask about a piece of accessible metalwork is 'Could it become live?' This is not new: it has been applied to metal trim on the outside of plastic TV cabinets for many years. It's so highly improbable that

Re: [PSES] Solar electric cars built by college students

Not commenting on the safety standard issue because not knowledgeable, but it is interesting to note that many conventional ICE-powered cars with 12 Vdc electrical systems don¹t bother to bond all metallic parts of a car together. It used to be that all you need to do to ground something was

Re: [PSES] Chamber grounding [General Use]

I think the issue is far more about electrical safety than EMC. Of course you are quite right about a Faraday cage not requiring an earth connection. It's what happens if there is a high-current live mains to accessible metal fault. The preferred technique depends on how such a fault is detected

Re: [PSES] Solar electric cars built by college students

UL 2202 is the UL standard for EV charging system equipment. Section 14 is on EV Bonding, and it requires the output circuit of the charger to provide a means for bonding the EV during charging for grounded system of protection. There are different protection schemes, so the need for bonding is

Re: [PSES] Chamber grounding [General Use]

In the US, 120 Vac and 60 Hz. The filter has a pass band below 1 kHz, and a stop band of 100 dB at 10 kHz. That requires large amounts of line-to-ground capacity and series inductance, and obviously at least five poles. Ken Javor Phone: (256) 650-5261 From: Richard Nute

Re: [PSES] Chamber grounding [General Use]

It's not so much that it needs filtering at the power frequency as it is that that much line to ground capacitance is needed to provide 100 dB of insertion loss down to 10 kHz (which is typical for chamber power filters). Back to the original question - I've had 3 and 10 meter chambers in

Re: [PSES] Chamber grounding [General Use]

"But as soon as mains filters are mounted on the wall, one has to cope with leakage currents (blind current) as large as 6 amp or more." 6 amps! At 230 volts, 50 Hz, Xc is 38.8 ohms. Total C from line to earth is 69.2 uF! (Presumably the filter has an equal capacitance from neutral to

Re: [PSES] Solar electric cars built by college students

I recommend against following Ferrari’s practice. Apparently, portions of the FXX K supercar are energized to 480 V when charging. There is a fin on the roof with flashing LEDs. Red means stay away and green means safe. http://jalopnik.com/the-ferrari-fxx-k-might-electrocute-you-1796961190 Ted

Re: [PSES] Chamber grounding [General Use]

Hi Brian, My understanding is that GTEMs struggle when anything involving cables is mentioned, presumably because no one can agree on an accurate, consistent, standardised method for routing them out of the test volume. 61000-4-20 has a clause in it that states that EUTs with cables are under

[PSES] Solar electric cars built by college students

Hello, Speaking of grounding, can someone share some thoughts on what would be the best practice regarding an earth ground for an electric car while plugged in and charging from the grid? Would it be best to tie a car's metal frame to ground while it's hooked up for a charge? *Dale Reid* -

Re: [PSES] Chamber grounding [General Use]

I was pondering how best to answer the OP but Gert Gremmen beat me to it with better words than I would have used. With regards to the last question, GTEMs are only good for the test sample enclosure itself, not the attached cables. When using a GTEM, I have told customers to measure cable common

Re: [PSES] Chamber grounding [General Use]

Warning Will Robinson - Brian is not an EMC expert. Agree with Herr Gremmen about the referencing of equipotential points - this was critical for my employer's current chamber because it was sitting next to a machine shop and a HALT chamber. Would suggest two or three cups of tea, followed by

Re: [PSES] Chamber grounding [General Use]

As for the purpose of operation, EMC chambers need no grounding. The shielding property happens by conduction of the shield material the chamber is made from. But as soon as mains filters are mounted on the wall, one has to cope with leakage currents (blind current) as large as 6 amp or more.

Re: [PSES] Chamber grounding [General Use]

Hi All Which is the best to use? Ground each EMC chamber via an earth spike or back to the transformer of the supply to the building? Which is best practice? Regards Andy Andrew Price Land & Naval Defence Electronics Division Prinicpal Environmental