A motorised rheostat is used to increase the applied voltage at a pre-set rate, while the voltage and leakage current are monitored via two digital meters. Alternating current AC may produce ventricular fibrillation of the heart if the path of the current involves a passage through the chest cavity.
The basic mechanical performance tests cover tensile strength and elongation at break, and puncture resistance. Care is taken to exclude any air pockets or bubbles, which therefore ensures continuous contact inside and outside the product under test.
Optional tests for gloves with special properties together with their associated marking codes are listed in Table 2. These tests are similar in principle to the Proof Voltage Test, except that a higher voltage is applied, usually around twice the voltage used in the proof test; this voltage does generally not need to be held for more than a few seconds and there are normally no performance requirements for leakage current, just that the glove material should not break down or puncture.
Common examples of this are: Glove samples are stored in the chamber for a defined period of Experiment tensile strength and voltage leakage before being visually assessed and subjected to electrical proof tests to assess any possible degradation.
If the equipment cannot be made safe or the job done in a different way, however, the use of Personal Protective Equipment PPEsuch as protective gloves which have been tested and approved as providing an acceptable level of protection against contact with a high voltages, will be required.
The risk of electrocution depends on the conductivity of the area of human skin in contact with the voltage source. The difference is Experiment tensile strength and voltage leakage one is used for standard measurements inches and the other is mostly use for metric measurements mm.
One probe is placed inside the glove and the other outside in the tank, and the test voltage applied in the normal way. If skin is wet, or if there are wounds, or if the live conductor penetrates the outer skin layers, then even voltage sources below 40 V can be highly dangerous if contacted.
Other data from the USA Bureau of Labor Statistics and Electrical Safety Foundation International suggests that in the five year period between and there were 1, fatal workplace accidents caused by contact with electricity, making this the seventh leading cause of occupational fatality.
SATRA has recently extended its high voltage testing capability from an in house designed machine generating 30 kV up to a new enlarged test chamber that is capable of generating voltages of up to 50 kV. The association between tension and torque should be considered carefully, since it is quite hard to specify the variation of conditions of a fastener.
This means the test protocol often includes a pre-treatment procedure to maximise the moisture content of the product. Many test specifications, such as those applied to gloves, include a wet test to ensure that all parts of the item meet the minimum required performance characteristics.
This level of voltage is then held for a defined period usually between one and several minutes, depending on the product standard, while the leakage current is monitored. This includes a range of tests, some of which are optional and only carried out if a specific property is to be claimed see Table 2.
The maximum force a fastener must tolerate before rupture is defined as Ultimate Tensile Strength. Considerable flexibility has been built into the cabinet to enable a wide range of PPE to be tested, including gloves and footwear to European and global standards.
This property may not immediately come to mind, or even seem to be particularly important, but it is relevant to a wide range of specialist end use applications. Output current options enable a trip current of up to 40 milliamp to be applied.
During this process both the force applied to the specimen and the extension of the specimen are recorded. Testing for safety There are a number of national and international standards designed to assess insulation resistance and all generally use a similar principal of test.
Then, some standards such as those used for insulating gloves include a second test to assess dielectric strength or electrical flashover, often referred to as a withstand voltage test. Applying maximum tensile force to a fastener that the outcome will not show plastic deformation is known as proof load.
Because the strength of fasteners is normally great, it is habitually to report these forces in kilonewton kN and kilopound-force klbf. Higher voltages of, say, up to 1, V, while still generally referred to in the electrical industry as low voltages, require gloves which meet specialised designs and testing requirements.
What is proof load? This is either achieved by storage in an environment with a defined high humidity, or, as is the case in ENby immersion in water. The mandatory test assessments include checks on dimensions, finish, marking and packaging, plus tests on basic mechanical performance, dielectric e.
For instance, the risk of shock can be removed if it is possible to work on the equipment with the supply disconnected, locked off and earthed.
Charts are available that show the probability of fibrillation with respect to magnitude of the electric current and the time for which it is present.
For this, the glove is placed in a tank and both the sample and the tank are filled with water. Torque is an incidental indication of tension, as many components can disturb this association, such as texture of the surface, oils, rubbish, thread series, rust and material type for instance.
One property that can never reliably be assessed visually, however, is the electrical resistance between the inner and outer surfaces of a glove — sometimes referred to as vertical resistance, rather than surface resistance which, as the name suggests, is a measure of the electrical resistance across one surface of the glove.
The amount of the twisting force necessary to rotate the nut along the bolt threads is known as torque, however tension is the elongation or elasticity of a fastener that provides the holding force of a joint.Di-electric Strength 65KV (volts) AC proof Voltage up to 36KV.
Low Temperature resistant. oil resistant. Flame Retardant. Good Aging properties. High Insulation resistance exceeding ; High tensile strength and elongation properties. Leakage Current less than 1mA. Properties. Minimum Retention in Tensile Strength. Di-electric Strength (High Voltage) Test and Leakage Current Test Proficiency Testing Program Please read the instructions carefully and perform the testing as directed.
Should you have any comments or questions, please refer them in writing to us by fax or Email: Fax: + Technical Specification for Lineman Electrical Rubber Insulating Hand Gloves-Electrical Purposes (Test) voltage and leakage current Each glove shall withstand the 50 Hz ac proof (test) voltage (rms value) Tensile strength Test c.
Elongation at break Test d.
Tension set test. Leakage distance (in.) Cantilever Strength (lb.) Tensile Strength (lb.) Torsional Strength (in-lb.) Compression Strength (lb.) Voltage Data Test Voltage to Ground (kV) Maximum RIV at 1,kHz (V) STANDARD INSULATORS Notes: 1.
These units are not furnished with mounting bolts. State size at time of inquiry if mounting bolts are. The association between tension and torque testing should be considered carefully.
Call Us: +1 to a specified fastener. The maximum force a fastener must tolerate before rupture is defined as Ultimate Tensile Strength. Torque Testing or Torsion Testing Frequently Tested Material. Metals; Test Specimen Shipping Form. Tensile Test Experiment.
One material property that is widely used and recognized is the strength of a material.
But what does the word "strength" mean?Download