Commercial developments.
Plan the electrical interfaces early.

A useful starting point

Builders and commercial-complex teams need to coordinate load demand, phased occupancy and the physical space reserved for electrical equipment. The transformer enquiry should reflect the approved engineering brief rather than a rule of thumb based only on floor area or an assumed capacity per building.

Typical needs to define

• Provide demand assumptions for lifts, HVAC, tenant areas and common services where relevant.
• Identify phased occupancy or expansion separately from the initial operating requirement.
• Share room layout, access route, ventilation, termination and maintenance-clearance requirements.

Which transformer type fits?

Oil-filled distribution and dry-type construction require different installation considerations; dry-type is confirmed only up to 3 MVA. The engineer must assess the building’s fire strategy, ventilation, service access and project requirements. A dry-type label alone is not a building-code approval or a guarantee of noise performance. Larger network requirements require a separate power/distribution design discussion.

What to send for a quote

• Consultant-approved load/demand schedule and supply-system details.
• Plant-room drawing, cable routes and any enclosure/acoustic requirements.
• Quantity, phased delivery destinations and the agreed supply/installation boundary.

Also include the required rating, HV/LV voltage, phase, frequency, winding preference, quantity and delivery state/country. Mark unknown values for confirmation rather than copying assumed defaults.

Documents and project-specific confirmation

OSTL acquired BIS licences in all five major transformer categories in 2020. Request the current licence documents and the applicable product/rating scope; this is not evidence of registration or approval by a utility or procurement platform. Routine tests per IS 1180 / IS 2026 are confirmed; the applicable standard and agreed test/document schedule must be checked for the offered design.

OSTL has manufactured transformers since 2007. The corporate office is in Kolkata and the transformer manufacturing unit is in Howrah, West Bengal. Discuss your brief with the Kolkata office on +91 93310 15264 or ostltd@hotmail.com.

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