General
Maximum voltage	1000 V (CAT IV)

This accessory set from Chauvin Arnoux is specifically designed for electrical specialists working in installations of categories CAT IV and CAT III. It serves as supplementary equipment for measuring instruments and enables safe and versatile use during testing and maintenance of electrical systems. The set includes several components optimized for different application scenarios, including insulated test probes, PVC test leads, and crocodile clips, all with defined voltage categories and insulation standards.

Applications
This accessory is primarily intended for work in high-voltage installations, particularly in category CAT IV, which applies to measurements at the power supply level (e.g., at meter connection boxes or distributors). The components are also suitable for CAT III applications, as found in industrial or commercial electrical installations. The additional test probes for CAT II extend the application range to systems with lower voltages, for example in household installations or on devices with operating voltages up to 300 V.

Functions and Equipment in Detail
The set contains two insulated test probes designed for a maximum voltage of 1000 V in category CAT IV. These are fully insulated to ensure safe contact with conductive parts. Two PVC test leads, one red and one black, each 1.5 m long, feature a straight and an angled plug, facilitating adaptation to tight or inaccessible measurement points. The leads are also rated for 1000 V CAT IV. Two crocodile clips, red and black, also rated for 1000 V CAT IV, allow flexible connections to terminals or wires. The set is supplemented by two additional insulated test probes with a diameter of 4 mm, designed for 300 V in category CAT II.

Technology Explained Simply
The insulation of the test probes and leads ensures complete isolation, increasing the operator’s safety, especially at high voltages. The use of PVC as material for the test leads provides good mechanical stability and resistance to environmental influences. The categories CAT IV, CAT III, and CAT II refer to safety classes according to international standards (e.g. IEC 61010), defining the maximum permissible voltage and environmental conditions under which the devices may be operated safely. Category CAT IV is the highest and applies to the power supply level, while CAT II applies to end devices and consumer installations.

Compatibility and Accessories
The set is intended as a supplement for measuring instruments used in electrical installations. The components are designed to be compatible with standard measuring instruments equipped with corresponding connectors (e.g. 4 mm plugs). The combination of straight and angled plugs allows flexible adaptation to various measurement points. The crocodile clips are suitable for quick and secure connections to terminals or exposed wires.

Installation and Mounting
Installation is performed by simply inserting the test leads into the corresponding sockets of the measuring instrument. The test probes are directly applied to the conductors to be measured, with the insulation ensuring safety. The crocodile clips are clamped onto the points to be tested, with the colour coding (red/black) aiding identification of phases or neutral conductors.

Operational Advantages
The set offers a comprehensive selection of accessory parts suitable for various applications in electrical engineering. The combination of different test probes, leads, and clips enables flexible and safe work. The insulation of all components increases operator safety, especially when working under voltage. The colour coding of the leads and clips simplifies identification and reduces error sources.