To check for the efficiency of electrical ground connections, technicians measure the ground resistance. Ideally, an electrical ground that has good contact with the Earth should have low resistance. The resistance of the ground connection may increase due to dry soil, corroded terminals or an uprooted stake. When this happens, the monitoring circuits may malfunction and not be able to protect the electrical system in case of a fault. There is also a high risk of personnel getting electrocuted when an insulator opens. It is a good idea to regularly measure the resistance of the electrical ground to ensure continuous operation of the electrical facility.
The common method of measuring ground resistance is using the 2, 3 or 4 wire method. This method can take too much time and effort because you need to use multiple leads and space them properly to measure ground resistance. The multiple wire method also uses bulky test equipment which can be difficult to carry around especially in the field. If you want a fast and simple way of measuring ground resistance, consider getting a clamp-on tester. This tester doesn’t use any leads which helps shorten set-up time and diagnostics.
Megger offers a line of ground testers that can help in the maintenance and troubleshooting of ground connections. The DET family of ground testers offers a comprehensive testing solution for ground rod and soil resistivity diagnostics.
Advanced clamp-on ground resistance testers that set new standards in terms of access, performance, features, simplicity of operation and safety.
Designed to be easy to use – a large selector switch makes selection of a 2 pole or 3 pole test easy with gloved hands – and the design makes the fitting of shorting links to perform 2 pole tests a thing of the past.
A rechargeable battery powered 4-terminal tester with selectable test frequencies, greater measurement sensitivity and attached rod technique and stakeless measurement capability.
Designed to be easy to use, a large selector switch makes selection of a 2 pole, 3 pole or 4 pole test easy with gloved hands – and the design makes the fitting of shorting links to perform 2 pole tests a thing of the past.
Suitable for the testing of single ground electrodes such as lightning conductors and other small grounding systems.
With offices in Texas, Illinois and New Jersey, Protec offers a full stocks of electrical test and measurement equipment, with rental options that work for you.