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A device and method for sensing current flowing in an electrical conductor. An open loop of flexible magnetically conductive material is positioned to substantially encircle a current carrying conductor. Two ends of the loop overlap to form a flux gap between them. Magnetic flux of the magnetic fiel

A device and method for sensing current flowing in an electrical conductor. An open loop of flexible magnetically conductive material is positioned to substantially encircle a current carrying conductor. Two ends of the loop overlap to form a flux gap between them. Magnetic flux of the magnetic field associated with the current is concentrated in the flux gap. A Hall Effect transducer mounted in the flux gap senses the magnetic field and hence the current flowing in the conductor.

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1. A device for sensing electric current through a conductor comprising: a single open, planar loop of flexible, magnetically conductive material positionable to substantially encircle the conductor and having a first end and a second end which overlap in the plane of the loop, the ends being pos

1. A device for sensing electric current through a conductor comprising: a single open, planar loop of flexible, magnetically conductive material positionable to substantially encircle the conductor and having a first end and a second end which overlap in the plane of the loop, the ends being positioned substantially parallel to and spaced from each other in the area of overlap to form a flux gap; a Hall Effect transducer positioned in the flux gap between the spaced ends; mounting means for holding the transducer in position in the flux gap; means for delivering operating power to the transducer; and means connected to the transducer for communicating the output of the transducer. 2. The device of claim 1 further comprising loop adjustment means for tightening the loop around the conductor. 3. A device for sensing electric current through a conductor comprising: an open loop of flexible, magnetically conductive material positionable to substantially encircle the conductor and having a first end and a second end which overlap, the ends being positioned substantially parallel to and spaced from each other in the area of overlap to form a flux gap, wherein the loop is substantially circular and planar and the first end overlaps the second end on the outside of the circular loop and extends tangentially from the loop beyond the area of overlap; a Hall Effect transducer positioned in the flux gap between the spaced ends; mounting means for holding the transducer in position in the flux gap; means for delivering operating power to the transducer; and means connected to the transducer for communicating the output of the transducer. 4. The device of claim 3 wherein the material of the loop is shaped into an indentation at a point on the circumference of the loop substantially opposite the tangential extension of the first end. 5. The device of claim 4 further comprising a fastening means connecting the indentation to the tangentially extended first end. 6. The device of claim 5 wherein the fastening means comprises a strap of adjustable length linking the indentation to the tangentially extended first end. 7. The device of claim 6 wherein the strap is composed of flexible plastic. 8. The device of claim 1 wherein the transducer mounting means comprises: a rigid board of insulating material on which the transducer is mounted; and means for attaching the rigid board to the first end in the area of overlap. 9. The device of claim 1 wherein the magnetically conductive material is a ferrous metal band. 10. The device of claim 9 wherein the band has a thin rectangular cross section with a thickness of approximately one-sixteenth inch. 11. The device of claim 1 wherein the Hall Effect transducer is a linear Hall Effect transducer. 12. A method of sensing an electric current through a conductor comprising: (a) substantially encircling a conductor with a single, open, planar loop of flexible, magnetically conductive material having a first end and a second end; (b) positioning the first end substantially parallel to and overlapping and spaced from the second end to form a flux gap; (c) mounting a Hall Effect transducer supplied with operating power in the flux gap; and (d) providing means for communicating the output of the transducer. 13. A method of sensing an electric current through a conductor comprising: (a) substantially encircling a conductor with a loop of flexible, magnetically conductive material having a first end and a second end; (b) positioning the first end substantially parallel to and overlapping and spaced from the second end to form a flux gap; (c) mounting a Hall Effect transducer supplied with operating power in the flux gap; (d) providing means for communicating the output of the transducer; and (e) adjusting the size of the loop to snugly encircle the conductor. 14. The method of claim 13 which further comprises adjusting the width of the flux gap between the first and second ends to a minimum.