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Thread: C.N.R Fuse?

  1. #1
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    Default C.N.R Fuse?

    This is just curiosity. I found this 15 amp fuse protecting a gas furnace. It is old (won't work with a 15 amp rejector ring) and of a type that I had not hear of before. Is CNR an type (former type) of fuse?

    I can't find any current references and I expect that a time-delayed fuse would be suitable if this blows. But what is/was the difference?

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  2. #2
    Join Date
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    Default Re: C.N.R Fuse?

    Peter,

    That is just a regular Edison base fuse, which is why the Safe-T Fuse adapter will not allow it to fit in.

    C.N.R simply means it is Canadian National Standards - Recognized.

    No, I did not know that (however, I did suspect that the C.N. meant Canadian National, but only because you are in Canada - does that count?), I found it here in a Google search.

    http://80.254.188.93/schurter/ams.ns...9Vol2Sec06.pdf

    I would not install a time delay fuse in its place, I would just keep some 15 amp Edison base fuses handy (C.N.R. approved, of course ).

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    David Banks's Avatar
    David Banks Guest

    Default Re: C.N.R Fuse?

    Peter. Hope this helps. CNR appears to stand for Canadian National Standards.
    http://80.254.188.93/schurter/ams.nsf/407303c74462b8b1c12569600042c70c/22a430a5c3e11e23c1256c000045278a/$FILE/E41599Vol2Sec06.pdf
    http://80.254.188.93/schurter/ams.nsf/407303c74462b8b1c12569600042c70c/22a430a5c3e11e23c1256c000045278a/$FILE/E41599Vol2Sec06.pdf
    Can not get it tio work. Anyway same site as Jerry posted.


  4. #4
    Ted Menelly's Avatar
    Ted Menelly Guest

    Default Re: C.N.R Fuse?

    Canada, where is Canada. Oh yeah, that's the country we let the French an British fight over


  5. #5
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    Default Re: C.N.R Fuse?

    I guess you're right on the CNR although I have never seen it (only CSA on anything electrical I've seen). But it is an old fuse so perhaps its from the day.

    Jerry, I think we might be talking about two different types of fuse rejecting systems. Are you referring to S-type fuses? From what I understand, those aren't used here. I was referring to what I think would be correctly called Edison fuses. The 'nubs' vary in diameter based on amperage, but they are different from S-types. You can install plastic rejector rings in a standard fuse panel to prevent overfusing.

    (Ted, its not so bad having people fight *over* you. Of course, there was that one time the country actually was attacked. But it turned out that particular Destiny wasn't Manifest after all ).

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  6. #6
    Join Date
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    Default Re: C.N.R Fuse?

    Peter,

    The photo you posted shows the Edison base fuse as the "Old 15 amp - Wide 'nub'"

    The others in the photo - I've never seen those before. Thanks for the photo.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

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