Electrical Works — HT/LT Panels, Distribution and Wiring

Electrical works on a commercial or industrial building cover HT and LT panels, power distribution, cabling, wiring, earthing and small power, from the load schedule through testing. The load calculation comes first because it fixes the sanctioned load, transformer, cable sizes and panel ratings, all of which are expensive to change later.

By Dhruv Agarwal · · 2 min read

What we deliver

HT and LT panels, power distribution, cabling, wiring, earthing and small power for commercial, industrial and institutional buildings — from the load schedule through testing and handover.

Electrical is the service every other system depends on. HVAC, firefighting pumps, lighting, lifts, IT and security all draw from the same distribution, so the decisions made at load-calculation stage quietly shape the whole building.

Scope of works

StageWhat we deliver
Load assessmentConnected load, diversity, sanctioned load application support
DesignSingle-line diagram, cable and panel sizing, discrimination
HT sideHT panel, transformer interface where in scope
LT sideMain LT panel, sub-distribution boards, busbar risers
CablingCable laying, containment, glanding, termination
Final circuitsWiring, small power, lighting circuits, floor boxes
EarthingEarth pits, bonding, lightning protection interface
TestingInsulation resistance, earth resistance, polarity, commissioning

What drives the cost

Connected load and diversity · HT supply versus LT-only · transformer and DG interface · cable lengths and routes · containment type · panel make and form of separation · number of final circuits and floor boxes · testing and documentation requirements.

Where projects go wrong

  • No realistic load schedule. Everything downstream — sanction, transformer, cables, panels — is sized off it.
  • Cables sized for current but not for voltage drop. Long runs in large buildings need upsizing that a simple current check misses.
  • Discrimination not checked. A fault on one circuit trips the upstream breaker and takes out a whole floor.
  • Earthing done to a minimum and never tested. It degrades, and it is the component that makes faults safe.
  • Containment sized exactly for day one. The next change becomes a rebuild.

Why Hagerstone

15 electricians in-house, with MEP delivered alongside interiors, facade, civil and PEB — so the electrical design is coordinated with the layout, the ceiling and the HVAC rather than retrofitted to them.

Owned tooling including measuring instruments, crimping tools and testing equipment, under ISO 9001 / 14001 / 45001 and 79+ quality checkpoints.

For air conditioning, see our HVAC services.

Standards referenced

Installation safety under the CEA (Measures relating to Safety and Electric Supply) Regulations, 2023. Wiring practice to IS 732. Earthing to IS 3043.

Standards referenced

Frequently asked

HT panels handle the high-tension supply coming in from the utility, typically at 11kV, and feed the transformer. LT panels take the stepped-down supply, normally 415V, and distribute it across the building to sub-distribution boards and final circuits. A small commercial floor may only ever see the LT side; a factory or a standalone building with its own transformer needs both.

Because it fixes the sanctioned load you apply for, the transformer and cable sizes, and the panel ratings — and all of those are expensive to change afterwards. Undersizing means an upgrade application and a rebuild; oversizing means paying demand charges and capital for capacity you never use. A realistic load schedule with diversity applied is the first electrical deliverable, not an afterthought.

Yes. Earthing is what makes a fault safe instead of lethal, and it protects sensitive IT and electronic equipment. It also degrades — soil dries, connections corrode — so earth resistance should be tested at installation and periodically after. It is inexpensive to do properly and one of the most common defects found in older installations.

Related

More in MEP

All MEP →

Planning an office or commercial project?

Tell us what you are planning. Message our team on WhatsApp, call us, or leave your number and we will call you back.

Request a callback