HT/LT Cable Mapping in Delhi NCR

Updated: 23 October 2026

What is HT/LT cable mapping in Delhi NCR?

HT/LT cable mapping in Delhi NCR is underground utility mapping focused on power: finding where the region's buried power cables actually run – their line, approximate depth and the points where they cross other services – and turning that into an accurate map before anyone excavates, bores or lays a new duct.

An HT cable, for high tension, usually means an 11 kV feeder or a higher-voltage circuit between grid substations; most new ones are XLPE cables. LT (low tension) covers the low-voltage mains running from distribution transformers to feeder pillars, streets, buildings and street lights.

On site the job combines two methods. Ground penetrating radar (GPR) picks up an underground cable as a reflection whether or not it is energised, while an EM cable locator traces metallic utilities energised by load current or by a signal the crew applies. Crews collect data along the route, and the output is a set of marks on the surface and a signed report; CAD or GIS drawings can be ordered as a separately quoted item. Our HT/LT cable route GPR survey page describes the service in full.

Why map power cables before digging anywhere in NCR?

NCR roads carry several generations of cabling, fiber optic ducts and other buried infrastructure laid by different owners, and archived records rarely agree with the ground. Mapping pays for itself, because utility strikes hurt in four plain ways:

• Safety. An excavator bucket or drill head that cuts an energised 11 kV cable puts the operator at serious risk.
• Outages. One strike on a feeder can black out a market, a hospital wing or a cluster of housing societies.
• Repair bills and delay. The owning licensee will expect the damage made good, and work on site usually stops while the fault is handled.
• Design changes. Finding a cable bank at a crossing after the bore pit is dug costs far more than moving the alignment on paper.

Metro, RRTS, flyover and expressway construction over the past two decades has also shifted many cables away from the positions on older drawings. That is one more reason to trust fresh underground utility detection over a sheet pulled from a file.

Who owns the HT and LT network in each part of NCR?

Knowing the licensee for an area tells you whose cables to expect and whose records to request. The main distribution licensees and the bodies that typically control the roads are:

National highways and expressways come under NHAI, higher-voltage transmission belongs to the state transmission utilities, and campuses or private townships may run internal networks of their own. Treat the table as a starting guide and confirm the owner of each buried asset stretch by stretch. Mezux Touch has no affiliation with any DISCOM; we survey for whichever contractor or owner places the order.

Which types of power cable turn up in an NCR survey?

HT feeders

11 kV cables linking substations, ring main units and transformers, often laid in groups along main roads, with higher-voltage circuits on some arterial corridors. These matter most because of the energy they carry.

LT mains and service cables

Low-voltage runs leaving transformers and feeder pillars, then branching into a connection for each plot. They are numerous, shallow in places and the least likely to be recorded anywhere.

Street-light and signal cables

Usually owned by the civic body or road agency rather than the DISCOM, following footpaths, medians and junctions.

Dead and abandoned cables

Old lengths left in the ground after a replacement. Radar sees them exactly as it sees live ones, so our report flags lines that EM tracing could not confirm as carrying current.

Private and captive networks

Cabling inside group housing societies, industrial estates, hospitals and corporate campuses, owned and maintained by the occupier. City-level detail is on our cable route pages for Delhi, Gurugram and Noida.

What terms should you understand on a cable map?

• Approximate depth – estimated from the travel time of the radar signal and accurate only within a tolerance set by the soil; never a guaranteed figure.
• Detection method – whether a line was found by GPR, by EM locating or by both. Lines confirmed by both methods carry more confidence.
• Crossing – a point where the proposed route meets an existing buried utility and a clearance has to be designed.
• Cable bank – several cables laid side by side, which radar may show as one broad response rather than separate lines.
• No-access stretch – a length left unscanned because of parked vehicles, stacked material, standing water or a locked gate.
• L-section – a depth profile of detected services along the route; with us it is the ₹32 per metre option.

What should a good HT/LT cable map include?

Whatever format the client asks for, a usable map answers the questions the excavation crew will face on the day. Look for:

1. Every detected cable and subsurface utility shown against fixed references the site team can find again, such as kerbs, poles and chamber covers.
2. Approximate depth at measured points, not one blanket figure for the route.
3. The method behind each find, with a plain note wherever confidence is low.
4. Each stretch the crew could not scan, and the reason.
5. The penetration depth the radar actually reached on every section, since the moisture content of wet clay and thick made ground both cause signal attenuation and limit it.
6. Ground marks on site that follow the same numbering as the report.

Our article on how GPR traces HT/LT cables explains what radar records over a cable, why a stated tolerance matters and how mapping underground utilities fits a typical mapping workflow.

How should you plan a cable mapping job across Delhi NCR?

Good planning starts on paper, well before a crew is booked:

• Define the route and width. Send a KML or route drawing with the corridor width to cover, and mark junctions, bore pits and crossings.
• Collect records. Ask the licensee and the road owner for whatever layouts they hold; even partial ones show where to scan hardest.
• Fix working windows. In a dense urban area, busy arterials may only be workable at night, which is charged separately, while internal colony and sector roads usually suit daytime work.
• Sort out access. Road cutting, traffic diversion and entry into private estates are matters to check with the road-owning agency or the estate office. Traffic arrangements and permissions sit outside our survey rate.
• Choose the scope. A standard route survey suits alignment work; the L-section option fits when the work order asks for a depth profile.

On price, a standard survey is ₹24 per metre and an L-section survey ₹32 per metre. Inside Delhi NCR the only floor is the 4 km minimum, so a 3 km stretch is billed as 4 km – ₹96,000 before GST – with no project minimum on top. Orders crossing 100 km get 25% off every metre, crossing 500 km 40%, and crossing 1,000 km 50%. Mobilisation, night shifts, traffic arrangements and CAD/GIS drawing sets are quoted on their own. All slabs are on the GPR survey price list, and region-wide detail is on the Delhi NCR GPR survey page.

Our crews and 58 company-owned GPR systems are based in Sector 41, Faridabad, so NCR sites are close to base. The start date for each job is set by crew planning and access, and confirmed when the order is placed.

How should cable records be kept after mapping?

A survey keeps its value only if the information outlives the project. A few practical habits help:

• File the signed report with the as-built drawings of whatever you install, so the next team sees both together.
• Put the survey date on every sheet; NCR streets change quickly with metro, drainage and road-widening work.
• Add new cables to the record as they are laid, with depth measured in the open trench before backfilling.
• Share each confirmed utility location with the asset owner where the contract allows, so their own layouts improve over time.
• Re-scan a stretch before fresh excavation if months have passed or other agencies have dug there since.

Ground marks wear off within days on a busy road. The written report, not the paint, is the record that lasts.