
Kini nga pagsulay naglakip sa teknik aron masigurado ang kahapin sa insulasyon ug sheath sa kable sa kuryente. Ang sapat nga kahapin sa insulasyon ug sheath gihatag sa kable sa kuryente aron makapasa sa voltage ug mekanikal nga stress nga gitakda sa kable sulod sa iyang serbisyo. Ang pagmedya sa kahapin niini mahimong pangutana aron siguraduhon kon sama ba sa giangkon o wala. Kini nga mga dimensyon nagtagbo sa safe ug reliable nga performance sa kable.
Kini usa ka puro nga proseso sa pagmedya, kungta ang aparato alang sa pagsulay kinahanglan mapili og maayo. Kinahanglan adunay micrometer gauge nga mahimo mogmedya sa least 0.01 mm variation, vernier caliper nga mahimo mogmedya sa least 0.01 mm count, measuring microscope nga may linear magnification nga dili paubos 7 beses ug mahimo mogmedya sa least 0.01 mm, ug graduated magnifying glass nga mahimo mogmedya sa least 0.01 mm.
Una, ibutang ang mga specimen sa uban-uban nga measuring instruments ug methods. Ang specimen mao ang 2 types: unang tipo mao ang mga pieces of core cable ug ikaduha mao ang slice pieces.

Ang mga pieces nga adunay haba nga dili paubos 300 mm nga gikuha gikan sa final product gamiton sa kasong round conductor ug outer sheath. Ang specimen kinahanglan gikuha gikan sa final product ug tangtangon tanang covering materials sa itaas sa insulasyon o sheath bisan walay damage. Ang sliced pieces gikan sa kable gamiton sa optical measurement. Sa kasong niini, ang materyales sa itaas ug sa ilalom sa insulasyon o sheath nga isulay, mahimo motangtangon kon kinahanglan. Ang slice gikuha sa sufficiently thin pieces along the plane perpendicular to the axis of the cable. Ang measurements preferably taken at room temperature. Ang diameter sa core sa kable ug ang diameter sa insulated core ug kable sa insulation as well as the sheath measured with the help of micrometer gauge or a vernier caliper. The measurement must be taken perpendicular to the axis of the core or cable.
Ang measurements kinahanglan gisulay sa different 3 points of equal interval along the length of the specimen. These intervals may be about 75 mm in the case of 300 mm long piece of specimen. Each measurement is taken for the diameter of inside and outside of the insulation or sheath. At each point two measurements shall be made for better accuracy. Hence total 6 measurements of the diameter of below as well as above of insulation/sheath are taken. Taking an average of 6 measured outer diameters; we get the average measured outer diameter of the insulation / sheath. Similarly, by taking an average of 6 measured inner diameters, we get the average measured inner diameter of the insulation / sheath. Difference of average outer and inner diameter divided by two is nothing but the average radial thickness of the insulation/sheath.

Where the visual examination of the specimen reveals eccentricity, the optical method shall be used by taking slice section the specimen.
In the case of sliced section the specimen is placed under a measuring microscope along the optical axis. For circular specimen 6 such measurements are taken along the periphery at a regular interval. For noncircular conductor, such measurement is done radially at each point where the thickness of insulation appears minimum. The numbers of slices are taken from a specimen at regular interval along its length in such a manner that the total of such measurement would be not less than 18. For example, in case of circular conductor, at least 3 slices are taken from a specimen and 6 measurements in each slice to be carried out. In case of noncircular conductor, the number of slices taken from a specimen depends upon the number of points of minimum thickness of insulation. As in this case measurement is only made at the minimum thickness points.
Para sa Core/Cable Piece
Asa, Dout mao ang average sa six measurements taken for outer diameter of the insulation/sheath
Asa, Din mao ang average sa six measurements taken for inner diameter of the insulation/sheath.
Para sa Slice Piece – The average of 18 optical measurements is taken as the minimum thickness of insulation/sheath.
Report
Heading – Pagsulay para sa Kahapin sa Insulasyon/Sheath
Cable Type –
Batch No./Lot No. –
Cable No./Drum No. –
Resulta:
Reference Specification ………………………………
Conclusion – Ang specimen meets/does not meet the requirements of specification.
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