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| Do you guys use an isolation transformer for your lab/workbench? |
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| AVGresponding:
--- Quote from: nctnico on February 05, 2023, 09:57:30 am --- --- Quote from: AVGresponding on February 03, 2023, 02:19:15 pm --- --- Quote from: Electro Detective on February 03, 2023, 10:35:35 am --- --- Quote from: tautech on February 03, 2023, 01:58:10 am --- --- Quote from: timeandfrequency on February 03, 2023, 01:45:11 am ---I couldn't find any seller that only sells one glove. --- End quote --- :-DD --- End quote --- Bob has you covered: :-+ www.bobthewelder.com.au/products/xt-left-handed-welding-gloves-green-long --------------------- FWIW folks: 30ma RCDs rarely trip at 30ma Anywhere from 15 to 28ma is what usually happens, and a good unit will have about 2 to 3ma repeatability i.e. test the suckers properly before trusting your life and gear with them, better still, use two RCDs piggy backed. One of the two 'may' trip 'faster', or both will work if the trip current approaches zap city. But they won't do you much good with an electrical fault or short in the chain, so..FUSE UP, just past the DUTs current rating, and you won't need an imitation rabbits foot or garlic necklace :phew: --- End quote --- Yes, unlike fuse or circuit breaker ratings, the RCD trip current is the maximum allowable for it to meet its standards. --- End quote --- Did'nt read the Eaton article but fully I doubt this statement is entirely true. There has to be a minimum as well so you have a defined amount of allowed leakage current. Otherwise it wouldn't make sense to sell unsensitive (300mA) and super sensitive (5mA) GFIs / RCDs --- End quote --- If you had bothered to read the article, you would have found out that the regulatory requirement is that the device should operate at between 50% and 100% of the rated trip current, and that typical trip values for a 30mA RCD are 18-23mA, with a 2-3mA variance in repeatability for good quality devices. |
| Electro Detective:
--- Quote from: AVGresponding on February 05, 2023, 10:15:29 am --- --- Quote from: nctnico on February 05, 2023, 09:57:30 am --- --- Quote from: AVGresponding on February 03, 2023, 02:19:15 pm --- --- Quote from: Electro Detective on February 03, 2023, 10:35:35 am --- --- Quote from: tautech on February 03, 2023, 01:58:10 am --- --- Quote from: timeandfrequency on February 03, 2023, 01:45:11 am ---I couldn't find any seller that only sells one glove. --- End quote --- :-DD --- End quote --- Bob has you covered: :-+ www.bobthewelder.com.au/products/xt-left-handed-welding-gloves-green-long --------------------- FWIW folks: 30ma RCDs rarely trip at 30ma Anywhere from 15 to 28ma is what usually happens, and a good unit will have about 2 to 3ma repeatability i.e. test the suckers properly before trusting your life and gear with them, better still, use two RCDs piggy backed. One of the two 'may' trip 'faster', or both will work if the trip current approaches zap city. But they won't do you much good with an electrical fault or short in the chain, so..FUSE UP, just past the DUTs current rating, and you won't need an imitation rabbits foot or garlic necklace :phew: --- End quote --- Yes, unlike fuse or circuit breaker ratings, the RCD trip current is the maximum allowable for it to meet its standards. --- End quote --- Did'nt read the Eaton article but fully I doubt this statement is entirely true. There has to be a minimum as well so you have a defined amount of allowed leakage current. Otherwise it wouldn't make sense to sell unsensitive (300mA) and super sensitive (5mA) GFIs / RCDs --- End quote --- If you had bothered to read the article, you would have found out that the regulatory requirement is that the device should operate at between 50% and 100% of the rated trip current, and that typical trip values for a 30mA RCD are 18-23mA, with a 2-3mA variance in repeatability for good quality devices. --- End quote --- Now we're rockin', well said mate :clap: Seriously folks, what part of trusting fool zone is not clear, when prodding OUCH!/HOSPITAL/BBQ/MORGUE voltages and trusting an RCD or GFCI, you struggled to release from a blister pack with bolt cutters and oxy cutting torch with entitlement to a refund, exchange, or gift voucher if faulty :popcorn: This comment is mainly aimed at newbies and overconfident amateurs, and many of us have been there at one time guilty as charged Apparently pros never get zapped terminally by RCD GFCI fails, and many that did past and present have never returned to tell us whether it was the current, voltage, or pacemaker failure that did them in :-// |
| Zero999:
I notice the original poster has deleted the first post. It does annoy me when that happens. There's no point in doing this. It just implies he's gone off in a strop. To answer the question: yes, I have one on my bench in the lab at work. Not only does it provide shock protection, as the circuit has no RCD, but it occasionally comes in handy for probing mains circuits with an oscilloscope and it reduces the leakage on switched mode power supplies. It's a useful piece of kit. Obviously I'm fully aware of the dangers and don't rely on it to provide complete protection against shock. I know full well, when the 'scope is connected, the circuit becomes connected to earth, although I often use a battery powered Owon 'scope, to prevent that. |
| nightfire:
On my bench at home I have also in my apartment no RCD installed for the wall outlet- cabling is older than standards dictate mandatory usage of RCD for every layman-operable circuit. I got my hands on ebay on a new 19" power strip from Rittal, andd mounted a PRCD plug on it, so this power strip is protected by a 30mA RCD. As an additional benefit the build quality of that strip is solid as a tank, and together it cost me less than 50 €. |
| timeandfrequency:
--- Quote from: Zero999 on February 14, 2023, 11:06:11 am ---I notice the original poster has deleted the first post. It does annoy me when that happens. There's no point in doing this. It just implies he's gone off in a strop. --- End quote --- I agree. Maybe he prefers being isolated from our answers. |
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