High voltage banana plugs ?! - Page 1
Forum section: electronics / general

author: JeLo
author_rank: Contributor
timestamp: September 27, 2024, 02:04:28 am
content: For some odd reason I need to connect a banana plug to a EHV cable. It's low current and I got no other option available. Basically it's to replace a cable from a CRT rejuvenator that is kind of different from most and also uses the anode connection. The part that connects to the CRT is practically 30Kv, as is normally the case for most bigger tubes and it's connected with an anode cap (though I've seen some PVMs that use some weird things...), but the part that connects to the tester / rejuvenator is actually a freaking banana plug! And yes, the original cable that came with it was like that, the unit is totally original. It's from a reputable brand in Germany that has since closed doors.... Doesn't matter, the thing here is I couldn't find any banana plugs speced to 30kv, so probably the device didn't work at that voltage either... Or maybe it did, IDK... But I wanted to use a secure connection without much hassle at the same time.Anyone knows a source ? I'm tempted to try a simple audio plug at this point, but so far have resisted it, there probably would be sparks everywhere ...Even the anode caps on the CRT side that connect to the flyback transformers sometimes produce sparks despite having been well insulated when the sets were produced, but as the rubber dries out some start to buzz.....

author: Someone
author_rank: Super Contributor
timestamp: September 27, 2024, 02:56:56 am
content: Have a look at Fluke 1555 to get an idea of how that fits in with modern safety requirements.

author: JeLo
author_rank: Contributor
timestamp: September 27, 2024, 04:56:40 am
content: Yes, I'm aware of the worldwide trend that now a days euthanasia is allowed in more and more places yet I'm at the verge of being prohibited from repairing my own old equipment in my own house because of "concerns" the government has for my own security.... Whatever that means today....Anyway, banana plugs anyone ?Maybe I posted this in the wrong forum !? I posted in here because it's related to power and high voltage is used in some power sources today... albeit in this case it's totally different because the current is low.... So maybe mods please move this to the repair forum.... I'll do it myself soon, I'm going to sleep now, maybe tomorrow or after there'll be some answers.

author: Phil1977
author_rank: Frequent Contributor
timestamp: September 27, 2024, 09:17:22 am
content: You won't find any banana plug specified for that voltage, because that means it must be safe to touch and operate in operation. A banana plug is absolutely inappropriate for that requirement!But if you cable it while everything conductive is securely grounded then you can also take a bare wire - then you just have to care for creepage or arcing.Please post a pic of the tester and its cabling to get better replies.

author: JeLo
author_rank: Contributor
timestamp: September 27, 2024, 08:29:02 pm
content: @PhilThanks. Well the device is a Müter BMR 95, I also went a ahead and bought a BMR 2005 that showed up, because the deal was too good to miss and those normally go for more... It's basically the same model with a "soft" option that's normally never used...There's a description here:https://crtdatabase.com/faq/muter-bmr-95-crt-testerAnd the cable is the red one on this photo (from the same site):https://crtdatabase.com/faq/muter-bmr-95-crt-tester/muter_bmr_cables.jpgI think the device works at a much lower voltage than what a CRT normally works, given the descriptions I've read like on this same site. The user manual don't say much about it, just tell one to connect the anode cable before operating it ...