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B.S. 951 Bonding Clamp.

Zoomup
Good morning,

                           I have often wondered at just what is the purpose of the locking nut on the main fixing screw on a B.S. 951 bonding clamp. On static non vibrating pipes I can hardly imagine the screw becoming loose. So, is the locking nut superfluous? Or is it perhaps to allow correct orientation of the razor blade sharp warning label?


Z.

  • 0
    AJJewsbury:
    Just consider wheel bolts or nuts on a car wheel. The bolts on my vehicle have to tolerate great temperature changes and vibration. They do not come loose, even without locking nuts.

    Wheel nuts have quite a reputation for coming loose - that's why these days they're multiply redundant (there are many on each wheel so one or even two can fail without risking the wheel coming off), torqued very carefully when altered and on larger vehicles have movement indicators added (those little plastic arrows).

       - Andy.


    I often observe people with metre long breaker bars struggling to remove rusted on wheel nuts of cars after a puncture. That and the dreaded quick change outlets with their air tools that achieve mega high torque settings when tightening wheel nuts/bolts, which can damage locking security wheel nut "keys". (Not a torque wrench in sight).


    I have noticed the indicators on H.G.V. wheels, and they always seem to be correctly positioned.


    Z.


    Z.


  • 0
    Zoomup:

    I often observe people with metre long breaker bars struggling to remove rusted on wheel nuts of cars after a puncture.


    Forget that. I once had a problem with a seized on brake drum. I had to use a ladder! ?


  • 0
    I take the label off and put the bolt through it.

    Then tighten the bolt down and then use the nut to tighten down onto the label with the label over the top of the connection.

    This means for someone to take the connection off they have to deliberately move the label out of the way, and they are more likely to notice it.

    I take the view that the label is there really to inform non electrical personnel what the earth cable is for, as any electrical operative would know already.

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