Ceramic unreinforced covering. It is designed for an external insulation of bushings, protects the basic insulation from weather effects and are a reservoir for an oil or gas filling up the bushing. It meets the requirements of GOST 5862-79. The material of the insulation part is a ceramic electrotechnical material of a subgroup 110 GOST 20419-83.
| Covering name | Designation of the drawing | GOST, TU, IEC | Voltage class, kV | The length of the insulation distance is not less than, cm | N, mm | D outer, mm | Weight, kg | Rough drawing | |
| nom. | prev. deviation ±10% | ||||||||
| П 360/290-1Г | НИЮД.757513.030 | GOST 5862-79 | 220 | — | 360 | 330 | 13,0 | 1,3 |  |
| П 515/225-1 О | НИЮД.757523.059 | GOST 5862-79 | 20 | 62 | 515 | 390 | 46,5 | 4,6 |  |
| П 505/210-1 О | НИЮД.757523.058 | GOST 5862-79 | 20 | 62 | 505 | 390 | 53,0 | 5,3 | |
| П 550/380-1 О | НИЮД.757523.060 | GOST 5862-79 | 20 | 62 | 550 | 540 | 83,6 | 8,3 | |
| П 700/240-1М | ИНЯЖ.757514.015 | GOST 5862-79 | 220 | — | 700 | 290 | 33,0 | 3,3 | |
| П 1150/240-1М | НИЮД.757513.029 | GOST 5862-79 | 330 | — | 1150 | 300 | 57,0 | 5,7 | |
| П 1990/240-2 О | ИНЯЖ.686174.036СБ | GOST 5862-79 | 220 | 630 | 1990 | 424 | 207,0 | 20,7 | |
| П 2025/210-3 О | НИЮД.686174.027СБ | GOST 5862-79 | 220 | 630 | 2025 | 399 | 193,0 | 19,3 | |
| П 2495/380-3 О | НИЮД.686174.036СБ | GOST 5862-79 | 220 | 720 | 2495 | 579 | 425,4 | 42,5 | |
| П 2750/300-1 О | НИЮД.686174.011СБ | GOST 5862-79 | 330 | 800 | 2750 | 494 | 390,5 | 39,0 | |
| П 2770/240-3 О | НИЮД.686174.029СБ | GOST 5862-79 | 220 | 885 | 2770 | 424 | 289,5 | 28,9 | |
| П 3950/330-1 О | НИЮД.686174.023СБ | GOST 5862-79 | 500 | 1180 | 3950 | 529 | 613,0 | 61,3 | |
| П 3955/380-1 О | НИЮД.686174.010СБ | GOST 5862-79 | 500 | 1180 | 3955 | 579 | 650,5 | 65,0 | |
| П 3970/300-1 О | НИЮД.686174.022СБ | GOST 5862-79 | 500 | 1180 | 3970 | 494 | 577,5 | 57,7 | |
| П 4900/420-2 О | НИЮД.686174.012СБ | GOST 5862-79 | 750 | 1575 | 4900 | 634 | 845,9 | 84,5 | |
| П 4900/470-2 О | НИЮД.686174.024СБ | GOST 5862-79 | 750 | 1575 | 4900 | 684 | 877,7 | 87,7 | |
| П 5525/420-2 О | НИЮД.686174.012-01СБ | GOST 5862-79 | 750 | 1770 | 5525 | 634 | 946,5 | 94,6 | |
Interpretation of the conventional value of a covering type:
P – covering;
Numerator of the fraction is the height of a covering, mm;
Denominator of the fraction is the maximum inner diameter of a covering, mm;
1; 2; 3 – modification;
M – environment – oil;
G – environment – gas;
O – climatic version;
The material of the insulation part is a ceramic electrotechnical material of a subgroup 110 GOST 20419-83.