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Thread: The Snake Oil Machine

  1. #111
    Join Date: Dec 2014

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    Quote Originally Posted by walpurgis View Post
    Hmm. It gets more complicated as it goes along.
    It gets even more confusing if you try to read around the subject ...
    I found the list below which appears to identify characteristic features of Class I and Class II devices, this was from the website of a firm offering electrical safety checks for businesses.
    On another site, they use actual examples to show that the list is, at best, missleading.

    -----------
    Class 1 Appliances

    With Class 1 appliances, the user is protected by a combination of basic insulation and the provision of an earth connection, thus providing two levels of protection. When PAT Testing Class 1 appliances, Earth Continuity and Insulation Resistance tests are carried out. So in summary:
    - If it is made of metal it must be a Class 1 appliance
    - If it has a three core cable it must be a Class 1 appliance
    - If the plug has a metal Earth pin it must be a Class 1 appliance


    Class 2 Appliances

    In Class 2 appliances, the user is protected by at least two layers of insulation. For this reason, Class 2 appliances are also known as Double Insulated. They do not require an earth connection. When PAT Testing Class 2 appliances, just the Insulation Resistance test is carried out. So in summary:
    - If the case is plastic it must be a Class 2 appliance
    - If there is a double box symbol on the rating plate it must be a Class 2 appliance


    ---------

  2. #112
    Join Date: Jan 2009

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    I was going to cite that site (no pun intended). The Wikipedia entry on the subject is pretty definative, but doesn't discuss testing protocols or methods.
    Barry

  3. #113
    Join Date: Jul 2009

    Location: Hampshire, UK

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    “If the plug has a metal earth pin it must be a Class I appliance”

    Seriously?. What a load of tosh! Every Class II item I own has a metal earth pin in the plug - it’s just not connected to anything!
    Engineers: fixing problems you didn't know you had in ways you don't understand.

  4. #114
    Join Date: Aug 2017

    Location: Hertfordshire, U.K.

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    I'm Graham.

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    Quote Originally Posted by Beobloke View Post
    “If the plug has a metal earth pin it must be a Class I appliance”

    Seriously?. What a load of tosh! Every Class II item I own has a metal earth pin in the plug - it’s just not connected to anything!
    Indeed! because if the plug socket is shuttered, it won't open without the plug having an earth pin. (I have seen plastic earth pins, though, but in a plug sealed to the cable.)
    GrahamS - It's not what you hear that counts, it's what you think you hear........

    Present Kit: NAD 326BEE, NAD C515BEE CD player, JVC QL-7 DD turntable, JVC Tonearm, Shure M97Ve, Audio Technica AT95EX, Pickering V15, JVC Z1E, Wharfedale Diamond 230s, Visual Rio interconnects and My Ears.

  5. #115
    Join Date: Dec 2014

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    Quote Originally Posted by Beobloke View Post
    “If the plug has a metal earth pin it must be a Class I appliance”

    Seriously?. What a load of tosh! Every Class II item I own has a metal earth pin in the plug - it’s just not connected to anything!
    Yep - that's the point.
    Everything on the list is missleading bar the last one mentioning the double box symbol.
    The other site I linked to has more examples showing how inaccurate the list is.

    Very confusing considering the list is provided by a firm offering electrical testing services

    Edited to add a link to the other site, scroll down for the examples:

    https://pat-testing-fss.blogspot.com...ppliances.html
    Last edited by mikmas; 30-07-2018 at 18:18.

  6. #116
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    Quote Originally Posted by Barry View Post
    I was going to cite that site (no pun intended). The Wikipedia entry on the subject is pretty definative, but doesn't discuss testing protocols or methods.
    Definative?

    Apologies, but I know you appreciate such pedantry!

    Marco.
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  7. #117
    Join Date: Jan 2009

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    Consequence of rapid typing, and my PC is not set up for automatic spell checking.
    Barry

  8. #118
    Join Date: Jan 2008

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    What browser are you using? Chrome, for example, has an automatic spell checker

    Marco.
    Main System

    Turntable: Heavily-modified Technics SL-1210MK5G [Mike New bearing/ETP platter/Paul Hynes SR7 PSU & reg mods]. Funk Firm APM Achromat/Nagaoka GL-601 Crystal Record Weight/Isonoe feet & boots/Ortofon RS-212D/Denon DL-103GL in Denon PCL-300 headshell with Funk Firm Houdini/Kondo SL-115 pure-silver cartridge leads.

    Paul Hynes MC head amp/SR5 PSU. Also modded Lentek head amp/Denon AU-310 SUT.

    Other Cartridges: Nippon Columbia (NOS 1987) Denon DL-103. USA-made Shure SC35C with NOS stylus. Goldring G820 with NOS stylus. Shure M55E with NOS stylus.

    CD Player: Audiocom-modified Sony X-777ES/DAS-R1 DAC.

    Tape Deck: Tandberg TCD 310, fully restored and recalibrated as new, by RDE, plus upgraded with heads from the TCD-420a. Also with matching TM4 Norway microphones.

    Preamps: Heavily-modified Croft Charisma-X. LDR Stereo Coffee. Power Amps: Tube Distinctions Copper Amp fitted with Tungsol KT-150s. Quad 306.

    Cables & Sundries: Mark Grant HDX1 interconnects and digital coaxial cable, plus Mark Grant 6mm UP-LCOFC Van Damme speaker cable. MCRU 'Ultimate' mains leads. Lehmann clone headphone amp with vintage Koss PRO-4AAA headphones.

    Tube Distinctions digital noise filter. VPI HW16.5 record cleaning machine.

    Speakers: Tannoy 15MGs in Lockwood cabinets with modified crossovers. 1967 Celestion Ditton 15.


    Protect your HUMAN RIGHTS and REFUSE ANY *MANDATORY* VACCINE FOR COVID-19!

    Also **SAY NO** to unjust 'vaccine passports' or certificates, which are totally incompatible with a FREE society!!!


  9. #119
    Join Date: Jan 2009

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    I'm openingabottleofwine.

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    Quote Originally Posted by Marco View Post
    What browser are you using? Chrome, for example, has an automatic spell checker

    Marco.
    Firefox. I can't install Chrome on my machine (it's too old), and I have abandoned Internet Explorer as, since a revision, it won't link to sites that are not https .
    Barry

  10. #120
    Join Date: Apr 2012

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    I'm Geoff.

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    There's spell check in Firefox. Yours may be turned off. This may help: https://www.technipages.com/firefox-...-spell-checker

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