Electrical protective equipment shall be maintained in a safe, reliable condition.
The following specific requirements apply to rubber insulating blankets, rubber insulating covers, rubber insulating line hose, rubber insulating gloves, and rubber insulating sleeves:
Maximum use voltages shall conform to those listed in Table I-4.
Insulating equipment with any of the following defects may not be used:
A hole, tear, puncture, or cut;
Ozone cutting or ozone checking (that is, a series of interlacing cracks produced by ozone on rubber under mechanical stress);
An embedded foreign object;
Any of the following texture changes: swelling, softening, hardening, or becoming sticky or inelastic.
Any other defect that damages the insulating properties.
Insulating equipment found to have other defects that might affect its insulating properties shall be removed from service and returned for testing under paragraphs (c)(2)(viii) and (c)(2)(ix) of this section.
The test method used under paragraphs (c)(2)(viii) and (c)(2)(xi) of this section shall reliably indicate whether the insulating equipment can withstand the voltages involved.
Note to paragraph (c)(2)(ix): Standard electrical test methods considered as meeting this paragraph are given in the following national consensus standards:
ASTM D120-09, Standard Specification for Rubber Insulating Gloves.
ASTM D178-01 (2010), Standard Specification for Rubber Insulating Matting.
ASTM D1048-12, Standard Specification for Rubber Insulating Blankets.
ASTM D1049-98 (2010), Standard Specification for Rubber Insulating Covers.
ASTM D1050-05 (2011), Standard Specification for Rubber Insulating Line Hose.
ASTM D1051-08, Standard Specification for Rubber Insulating Sleeves.
ASTM F478-09, Standard Specification for In-Service Care of Insulating Line Hose and Covers.
ASTM F479-06 (2011), Standard Specification for In-Service Care of Insulating Blankets.
ASTM F496-08, Standard Specification for In-Service Care of Insulating Gloves and Sleeves.
Note to paragraph (c)(2)(ix): Standard electrical test methods considered as meeting this paragraph are given in the following national consensus standards:
ASTM D120-09, Standard Specification for Rubber Insulating Gloves.
ASTM D178-01 (2010), Standard Specification for Rubber Insulating Matting.
ASTM D1048-12, Standard Specification for Rubber Insulating Blankets.
ASTM D1049-98 (2010), Standard Specification for Rubber Insulating Covers.
ASTM D1050-05 (2011), Standard Specification for Rubber Insulating Line Hose.
ASTM D1051-08, Standard Specification for Rubber Insulating Sleeves.
ASTM F478-09, Standard Specification for In-Service Care of Insulating Line Hose and Covers.
ASTM F479-06 (2011), Standard Specification for In-Service Care of Insulating Blankets.
ASTM F496-08, Standard Specification for In-Service Care of Insulating Gloves and Sleeves.
Insulating equipment shall be cleaned as needed to remove foreign substances
Insulating equipment shall be stored in such a location and in such a manner as to protect it from light, temperature extremes, excessive humidity, ozone, and other damaging substances and conditions.
Protector gloves shall be worn over insulating gloves, except as follows:
Protector gloves need not be used with Class 0 gloves, under limited-use conditions, when small equipment and parts manipulation necessitate unusually high finger dexterity.
Note to paragraph (c)(2)(vii)(A): Persons inspecting rubber insulating gloves used under these conditions need to take extra care in visually examining them. Employees using rubber insulating gloves under these conditions need to take extra care to avoid handling sharp objects.
Note to paragraph (c)(2)(vii)(A): Persons inspecting rubber insulating gloves used under these conditions need to take extra care in visually examining them. Employees using rubber insulating gloves under these conditions need to take extra care to avoid handling sharp objects.
If the voltage does not exceed 250 volts, ac, or 375 volts, dc, protector gloves need not be used with Class 00 gloves, under limited-use conditions, when small equipment and parts manipulation necessitate unusually high finger dexterity.
Note to paragraph (c)(2)(vii)(B): Persons inspecting rubber insulating gloves used under these conditions need to take extra care in visually examining them. Employees using rubber insulating gloves under these conditions need to take extra care to avoid handling sharp objects.
Note to paragraph (c)(2)(vii)(B): Persons inspecting rubber insulating gloves used under these conditions need to take extra care in visually examining them. Employees using rubber insulating gloves under these conditions need to take extra care to avoid handling sharp objects.
Any other class of glove may be used without protector gloves, under limited-use conditions, when small equipment and parts manipulation necessitate unusually high finger dexterity but only if the employer can demonstrate that the possibility of physical damage to the gloves is small and if the class of glove is one class higher than that required for the voltage involved.
Insulating gloves that have been used without protector gloves may not be reused until they have been tested under the provisions of paragraphs (c)(2)(viii) and (c)(2)(ix) of this section.
Electrical protective equipment shall be subjected to periodic electrical tests. Test voltages and the maximum intervals between tests shall be in accordance with Table I-4 and Table I-5.
Insulating equipment failing to pass inspections or electrical tests may not be used by employees, except as follows:
Rubber insulating line hose may be used in shorter lengths with the defective portion cut off.
Rubber insulating blankets may be salvaged by severing the defective area from the undamaged portion of the blanket. The resulting undamaged area may not be smaller than 560 millimeters by 560 millimeters (22 inches by 22 inches) for Class 1, 2, 3, and 4 blankets.
Rubber insulating blankets may be repaired using a compatible patch that results in physical and electrical properties equal to those of the blanket.
Rubber insulating gloves and sleeves with minor physical defects, such as small cuts, tears, or punctures, may be repaired by the application of a compatible patch. Also, rubber insulating gloves and sleeves with minor surface blemishes may be repaired with a compatible liquid compound. The repaired area shall have electrical and physical properties equal to those of the surrounding material. Repairs to gloves are permitted only in the area between the wrist and the reinforced edge of the opening.
Repaired insulating equipment shall be retested before it may be used by employees.
The employer shall certify that equipment has been tested in accordance with the requirements of paragraphs (c)(2)(iv), (c)(2)(vii)(D), (c)(2)(viii), (c)(2)(ix), and (c)(2)(xi) of this section. The certification shall identify the equipment that passed the test and the date it was tested and shall be made available upon request to the Assistant Secretary for Occupational Safety and Health and to employees or their authorized representatives.
Note to paragraph (c)(2)(xii): Marking equipment with, and entering onto logs, the results of the tests and the dates of testing are two acceptable means of meeting the certification requirement.
Note: The dc voltages listed in this table are not appropriate for proof testing rubber insulating line hose or covers. For this equipment, dc proof tests shall use a voltage high enough to indicate that the equipment can be safely used at the voltages listed in Table I-4. See ASTM D1050-05 (2011) and ASTM D1049-98 (2010) for further information on proof tests for rubber insulating line hose and covers, respectively.
1 The water level is given as the clearance from the reinforced edge of the glove to the water line, with a tolerance of ±13 mm. (±0.5 in.).
2 If atmospheric conditions make the specified clearances impractical, the clearances may be increased by a maximum of 25 mm. (1 in.).
1 The maximum use voltage is the ac voltage (rms) classification of the protective equipment that designates the maximum nominal design voltage of the energized system that may be safely worked. The nominal design voltage is equal to the phase-to-phase voltage on multiphase circuits. However, the phase-to-ground potential is considered to be the nominal design voltage if:
1 If the insulating equipment has been electrically tested but not issued for service, the insulating equipment may not be placed into service unless it has been electrically tested within the previous 12 months.
[59 FR 4435, Jan. 31, 1994; 59 FR 33658, June 30, 1994; 79 FR 20629-20632, April 11, 2014]
Note to paragraph (c)(2)(xii): Marking equipment with, and entering onto logs, the results of the tests and the dates of testing are two acceptable means of meeting the certification requirement.
| TABLE I-1-AC PROOF-TEST REQUIREMENTS | |||||
| Class of Equipment | Proof-test Voltage rms V |
Maximum proof-test current, mA (gloves only) |
|||
| 280-mm (11-in) glove |
360-mm (14-in) glove |
410-mm (16-in) glove |
460-mm (18-in) glove |
||
| 00 0 1 2 3 4 |
2,500 5,000 10,000 20,000 30,000 40,000 |
8 8 |
12 12 14 16 18 |
14 16 18 20 22 |
16 18 20 22 24 |
| TABLE I-2-DC PROOF-TEST REQUIREMENTS | |
| Class of equipment | Proof-test voltage |
| 00 0 1 2 3 4 |
10,000 20,000 40,000 50,000 60,000 70,000 |
| TABLE I-3-GLOVE TESTS-WATER LEVEL 12 | ||||
| Class of glove | AC proof test | DC proof test | ||
| mm | in | mm | in | |
| 00 0 1 2 3 4 |
38 38 38 64 89 127 |
1.5 1.5 1.5 2.5 3.5 5.0 |
38 38 51 76 102 153 |
1.5 1.5 2.0 3.0 4.0 6.0 |
1 The water level is given as the clearance from the reinforced edge of the glove to the water line, with a tolerance of ±13 mm. (±0.5 in.).
2 If atmospheric conditions make the specified clearances impractical, the clearances may be increased by a maximum of 25 mm. (1 in.).
| TABLE I-4-RUBBER INSULATING EQUIPMENT, VOLTAGE REQUIREMENTS | |||
| Class of equipment | Maximum use voltage 1 AC rms |
Retest voltage 2 AC rms |
Retest voltage 2 DC avg |
| 00 0 1 2 3 4 |
500 1,000 7,500 17,000 26,500 36,000 |
2,500 5,000 10,000 20,000 30,000 40,000 |
10,000 20,000 40,000 50,000 60,000 70,000 |
1 The maximum use voltage is the ac voltage (rms) classification of the protective equipment that designates the maximum nominal design voltage of the energized system that may be safely worked. The nominal design voltage is equal to the phase-to-phase voltage on multiphase circuits. However, the phase-to-ground potential is considered to be the nominal design voltage if:
- There is no multiphase exposure in a system area and the voltage exposure is limited to the phase-to-ground potential, or
- The electric equipment and devices are insulated or isolated or both so that the multiphase exposure on a grounded wye circuit is removed.
| TABLE I-5-RUBBER INSULATING EQUIPMENT, TEST INTERVALS | |
| Type of equipment |
When to test |
| Rubber insulating line hose, Rubber insulating covers. Rubber insulating blankets. Rubber insulating gloves Rubber insulating sleeves |
Upon indication that insulating value is suspect and after repair. Upon indication that insulating value is suspect and after repair. Before first issue and every 12 months thereafter; 1 upon indication that insulating value is suspect; and after repair. Before first issue and every 6 months thereafter; 1 upon indication that insulating value is suspect; after repair;and after use without protectors. Before first issue and every 12 months thereafter; 1 upon indication that insulating value is suspect; and after repair. |
1 If the insulating equipment has been electrically tested but not issued for service, the insulating equipment may not be placed into service unless it has been electrically tested within the previous 12 months.
[59 FR 4435, Jan. 31, 1994; 59 FR 33658, June 30, 1994; 79 FR 20629-20632, April 11, 2014]
Insulating equipment shall be inspected for damage before each day's use and immediately following any incident that can reasonably be suspected of causing damage. Insulating gloves shall be given an air test, along with the inspection.
Note to paragraph (c)(2)(ii): ASTM F1236-96 (2012), Standard Guide for Visual Inspection of Electrical Protective Rubber Products, presents methods and techniques for the visual inspection of electrical protective equipment made of rubber. This guide also contains descriptions and photographs of irregularities that can be found in this equipment.
Note to paragraph (c)(2)(ii): ASTM F1236-96 (2012), Standard Guide for Visual Inspection of Electrical Protective Rubber Products, presents methods and techniques for the visual inspection of electrical protective equipment made of rubber. This guide also contains descriptions and photographs of irregularities that can be found in this equipment.