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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
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    Default Re: C.N.R Fuse?

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

    Ted Menelly, Castle Home Inspection Services
    www.inspectmycastle.com
    Fort Worth, Keller, Southlake, Plano, Flower Mound, DFW, TX

  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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