Before and after the test, the terminal block must pass the voltage drop test. The requirements are met if, after the test, the individual parts are undamaged and they can still be used. Protective conductor terminal blocks are subjected in three stages of one second each to a current density of 120 A/mm² with the rated cross section. For testing purposes, a terminal block is mounted on the support and wired to a conductor with the rated cross section. This can take up to several tenths of a se- cond. Quality features Short-time current resistance IEC 6/-2 Terminal blocks must, in practice, also be capable of resisting short-circuit currents until the relevant safety equipment cuts off the current without sustaining any damage. 500 10 60 578 Terminal blocks Quality features Absorption of tensile force at a 6 mm² screw terminal block In the case of the TB 240 I high-current ter- minal block, a test current of 28,800 A is passed through the terminal block for one second without loss of quality. Conductor cross section Tractive force 0.2 4 240 AWG / kcmil 24. The TB screw termi- nal blocks withstand tensile forces up to 100% above the required minimum values. The conductor must be held wit- hout causing damage. The tensile force exerts stress on the conductor at the termi- nal point. Performing these two tests directly one after the other inten- sifies the requirements. This test is perfor- med after the flexion test. To test the tensile load capacity of a terminal point, the terminal point must withstand a given tensile force based on the cross secti- on for over 60 seconds. Cor- rectly wired terminal blocks must therefore offer a high degree of mechanical safety. Quality features Conductor pull-out test IEC 6/-2 In practice, tensile forces can affect the ter- minal point during wiring or operation. Test sequence for terminal blocks in accordance with IEC 6/2: – Connection capacity – Mechanical strength – Bending test – flexion test – Conductor pull-out test – Modular terminal block fixed securely – Air clearances and creepage distances – Impulse withstand voltage test – Voltage drop test – Temperature-rise test – Short-time current resistance – Dielectric test – Aging test – Needle flame test 8 Phoenix Contact For further information and full technical data, visit /products This high quality is demonstrated by recognized tests which are documented in national and international standards. High-quality physical properties and advanced industrial standards are evidenced by connections with long-term stability. TB terminal blocks represent compact, high-performance electrical connections. This is not tested subsequently on finished pro- ducts, but is ensured responsibly during every step of production. Terminal blocks Quality features Quality features Quality tests Reliable connections - that is our everyday motto. Conductor pull-out test: IEC 6/-2 For further information and full technical data, visit /products Phoenix Contact 7 TB terminal blocks can accommodate conductors up to a cross section of 240 mm². Salt spray: IEC 6/-52 Conductors with a larger cross section are used for the connection between SCBs and inverters due to the higher currents and longer cable lengths. Thanks to the use of mo- dern materials, the TB terminal blocks are also ideal for use in challenging environ- ments, such as atmospheres containing salt or at temperatures as low as -60☌. Short-time withstand current: IEC 6/-2 Signals can be transmitted safely in a confi- ned space with the compact double-level terminal blocks. Temporary high currents, e.g., when starting up electric motors, present no pro- blem for the TB terminal blocks. Vibration test: IEC 6 Machine building Signal technology Photovoltaics The amount of wiring effort and space re- quired when connecting sensors and actua- tors can be reduced considerably with the TBIO. Touch proofness: IEC 60529 / DIN EN 50274 When it comes to the modular structure of wind turbine generators, the TB terminal blocks with connector help prevent wiring errors and save time. Corrosion test: DIN 50018 The TB series is ideal for the energy supply sector with its individual and easily configu- rable measuring transducer sets for all cur- rent transformer and voltage transducer ap- plications. The terminal blocks with disconnect zone, which are the same shape, also allow component connectors or fuse plugs to be used to protect the signals. Quality features Infrastructure Power engineering Wind power Terminal blocks Quality features Measuring devices can be looped in quickly and easily with knife disconnect terminal blocks to check the system during startup and maintenance.
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