The specification covers the design, manufacturing, testing at works, supply & delivery of Tamper Proof Poly Carbonate Plastic Seal for sealing electrical installations viz. meter body for energy meters, terminal cover of energy meters, Metal Box and for other metering purpose. The size of the seal shall be 20 x 14 x 7 + .05 mm. These Seals shall be used for LT, HT Industrial Consumers and in theft prone areas.
The Poly Carbonate Plastic Seal shall be suitable for satisfactorily working under the following climatic conditions:
Max. Ambient Temperature | 60° C |
Min. Ambient Temperature | -5° C |
Max. Relative Humidity | 100% |
Min. Relative Humidity | 23% |
Altitude | Within 1000 meters above mean seal level. |
The Poly Carbonate Plastic Seal shall be suitably designed and treated for normal life and satisfactory operation under the hot and hazardous tropical climate conditions.
The seal shall be designed for a single use only. The seal shall be damaged, due to its see through property, if tampered with the help of puller, knife or any other sharp instruments. The sign of internal tampering shall be easily detected; it should not be reused, once opened. The seal shall be made in such a way that it can be easily locked with the help of finger and thumb pressing and no tools shall be required to close the seal in the laboratory or at site. After inserting the seal wire through hole of female part, the cap of the male part shall be fitted in the female part in such a way that it should not leave any space to avoid insertion of any sharp tools for opening of seal body or the female part in hot or cold condition.
The raw material used for polycarbonate plastic seals shall be of M/s. Dow Caller Ltd. Switzerland (Grade 201-15) M/s. GE Plastic, Singapore (Grade 143R), M/s. Du Pont, Japan (Grade LV-11, U.V. Stabilize), M/s Bayer Plastic (Grade-2407),M/s. Mitsubishi Engineering-Plastics Crop( Grade LUPILON PC S-3000UR) or any other equivalent manufacturer having similar material properties as under:
Sr.No. | Material Description | Particulars Polycarbonate |
---|---|---|
1 | Melting temperature | 280° C to 295° C |
2 | Specific gravity | 1.20 at 27° C |
3 | Use | Engineering |
4 | Size | 20 x14 x 7 + 0.5 mm. tolerance |
5 | Softness | Hard |
6 | Durability | Weather effect resistant (UV Resistant) |
7 | Transparency | Fully transparent (for the life of the seal) |
The seal body will be colorless, transparent (see through) type, which shall give complete visualization of its fixing mechanism and shall show clear indication if tampered with. Also seal’s anchor can be of different colour like Red, Blue, Yellow, Green and Orange etc for necessary area wise applicable colour coding i.e. two different colour in same seal, which makes seal unique.
The seal will be anchor type, tamper evident with eight locking system and shall be of different color codes (for e.g. one particular color shall be used by M&P Organization other by the (OP) Wring and 3rd by the purchasing/inspecting agency.
Non repeat seven digits numeric Sr.No, on the seal shall be Laser type in contrast color. Its should be provided on anchor flap i.e. on the top of anchor part and on the bottom side of the female part.
The seal shall have facility for embossed type monogram of COMPANY logo in 8mm circle on front side and rear side of body of seal.
Seal wire should be molded in seal in such way that it should be connecting male female part of the seal and remaining open wire will be used for sealing. The non corrosive non magnetic inox 304 grade, two twisted wires, each of 0.45 + 0.01 mm dia with over all diameter of wire 0.9 + 0.05 mm, so that it can easily insert into the female portion where the diameter of two hole shall be 1.00 mm + 0.2 mm. Total seal wire length should be of 160 mm. (open wire length)
The seal shall be type tested for the following tests, and type test should not be more than 5 year old.
The seal shall be tested at the manufacturer’s works for the following tests:
In short, if the seal is tested for any of the above tests, in no condition the male and female part shall be separated without affecting damaging the seal. In case, if they are separated, the seal shall have sufficient temper evident. Also, if seal wire is pulled out from the seal in any of the above tests, it shall not come out from the seal without damaging seal.
As per IS 4905. The seals, used in testing, shall be destroyed in the presence of inspecting officer.
The seal will be guaranteed for a minimum period of two years. In case, if any defect in design and manufacturing is noticed within the guarantee period the seals shall be replaced within one month free of cost.
The sample of seals with logo of on front side & logo on backside of the female part of the seal. The seals shall also be provided sr. no. of 0000000 to 0000000 on top of the male part of the seal as well as side of the female part of the seal as shown in the drawing.
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