Underground Cabling & Earthing
POLARIS provides professional underground cabling and earthing solutions for industrial, commercial, and infrastructure electrical projects across Gujarat. Underground cabling protects power distribution networks from weather damage, eliminates overhead hazards, and provides a cleaner and safer electrical infrastructure for facilities. POLARIS manages complete underground cable laying scope — from route survey and cable selection to trench excavation, cable pulling, jointing, termination, and testing. For earthing systems, POLARIS designs and installs comprehensive earthing networks as per IS 3043 — ensuring that all electrical equipment, structures, and systems have effective fault current paths to earth, protecting personnel and equipment from electrical hazards. POLARIS uses chemically treated earth electrodes, copper-bonded earth rods, and suitable earthing conductors to achieve the required earth resistance values.
Key Features
- Underground HT and LT cable laying with proper route planning and depth compliance.
- Cable trench excavation, sand bedding, cable pulling, brick protection, and backfilling.
- XLPE armoured cable termination with proper cable lugs, glands, and shrink joints.
- Cable insulation resistance testing, high-voltage testing, and phase rotation verification.
- Earthing network design and installation as per IS 3043 and electrical safety codes.
- Earth pit construction with copper-bonded earth rods and chemical earth compounds.
- Main earthing conductor installation with proper bonding to all panels and equipment.
- Earth resistance measurement using clamp meters and fall-of-potential method.
- Lightning arrester installation and earthing for high structures and electrical equipment.
- Documentation including cable route drawings, test reports, and earthing layout drawings.
Frequently Asked Questions
Why is a proper earthing system important in industrial electrical installations?
A proper earthing system provides a safe path for fault currents to flow to earth, preventing dangerous voltage build-up on equipment bodies and protecting personnel from electric shock. It also ensures correct operation of protection relays and circuit breakers during fault conditions, limiting equipment damage in industrial electrical systems.
What is the earth resistance value required for industrial installations?
As per IS 3043, the earth resistance should generally not exceed 1 ohm for power systems and 2 ohms for general earthing systems. For lightning protection, it should be below 10 ohms. POLARIS measures and verifies earth resistance using calibrated earth testers after installation and provides a test certificate.
What types of earth electrodes does POLARIS use for earthing systems?
POLARIS uses copper-bonded steel rods, GI earth rods, copper earth plates, and maintenance-free chemical earth electrodes depending on the soil resistivity, space constraints, and project specifications. Chemical earth compounds are used to improve contact resistance in rocky or high-resistivity soil conditions.
How does POLARIS select the correct cable size for underground installations?
Cable selection is based on the current-carrying capacity, voltage drop, short-circuit withstand, and installation conditions. POLARIS performs cable sizing calculations as per IS 3961 and BS 7671 standards and recommends the optimum cable cross-section for each circuit.
Can POLARIS carry out cable jointing for underground HT cables?
Yes. POLARIS has trained technicians for HT cable jointing using cold-shrink and heat-shrink joint kits for XLPE armoured cables. Cable joint installation is done as per manufacturer specifications and followed by insulation resistance and high-voltage testing to verify joint integrity.