BIS licensing and buyer approval are different
Searching for a “BIS approved transformer manufacturer”? The precise starting point is the manufacturer’s BIS licence and its applicable scope, followed separately by the tender’s technical and eligibility requirements. OSTL acquired BIS licences in all five major transformer categories in 2020. Ask for current documents and the exact category/rating coverage before using them in a bid.
Supply against an agreed tender specification
OSTL supplies against agreed tender specifications and can provide documentation on request. Send the complete schedule and amendments for review; this is not an unconditional statement of compliance with every tender. Any exceptions, unconfirmed requirements and the accepted scope must appear in the written offer.
OSTL manufactures power and distribution transformers within an overall range of up to 10 MVA and up to 66 kV; the exact rating/voltage combination needs confirmation. Dry-type transformers are a confirmed product line up to 3 MVA. The 66 kV company-range statement must not be applied to dry-type products.
Tender-buyer contexts
| Topic | What to request or confirm |
|---|---|
| GeM procurement | Confirm current GeM seller/OEM registration, relevant category listing and bid-specific eligibility with OSTL before relying on them. No GeM registration or approval is claimed here. |
| Indian DISCOM / utility tenders | Check the named utility’s vendor-registration/approval scope, validity and any factory-inspection or past-performance criteria. BIS licensing is not DISCOM empanelment. |
| NEA — Nepal Electricity Authority | Ask OSTL to confirm any current NEA vendor status and the particular tender’s qualification, technical and cross-border documentation requirements. No NEA approval is claimed. |
| BPC — Bhutan Power Corporation | Confirm the tender’s supplier eligibility, technical schedule and any buyer-specific registration/documentation. No BPC registration or approval is claimed. |
| Bangladesh utility procurement | Identify the actual utility and tender. Confirm bidder/vendor eligibility, standards and import/document requirements; no Bangladesh utility approval is claimed. |
| A&N Electricity Department | For Andaman & Nicobar tender enquiries, confirm department-specific eligibility, technical conditions and island delivery/handling scope. No approved-vendor status is claimed. |
Build a document request, not a badge collection
- Current BIS licence documents with the category, rating/voltage scope and validity relevant to the offered design.
- ISO certificate copies: OSTL is ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certified. Copies available on request (view certifications).
- Completed technical particulars, approved/proposed drawings, deviations and the agreed routine-test schedule per applicable IS 1180 / IS 2026 requirements.
- Any type/special-test evidence, third-party inspection or witnessing requested by the tender: availability, scope and acceptability to confirm; no unverified lab accreditation is claimed.
- Commercial eligibility documents, buyer-specific registrations and past-performance evidence only when current, applicable and approved for disclosure.
Send the tender pack to the Kolkata office
- Tender reference and buyer, complete technical schedule, drawings and all amendments.
- Required rating, voltages, construction, quantity and the requested delivery/dispatch destination.
- Bid deadline, document-submission requirements, inspection requirements and commercial scope.
Email ostltd@hotmail.com or call / WhatsApp +91 93310 15264. Office: 33A Jawaharlal Nehru Road, Chatterjee International Centre, 8th Floor, Room A12, Kolkata 700071. Landline: 033 4061 3200.
Related buying guidance
Prepare the quotation brief
Copy or download the blank checklist; mark unknown values for confirmation.
↗UTILITY BUYERSPower utilities & DISCOMs
Review technical schedules, acceptance documents and eligibility as separate questions.
↗CONFIRMED COMPANY FACTSQuality & testing
Review the stated credentials and routine-testing framework; confirm exact applicability.
↗Questions before you enquire
Does BIS licensing mean approval by every utility?
No. A BIS licence has a defined product scope. Utility vendor approval, procurement-platform registration and tender eligibility are separate matters requiring current confirmation.
Can I request tender documentation?
Yes. Send the tender reference, complete specification and amendments to OSTL. Relevant documentation can be requested; exact availability, scope and compliance must be confirmed for the offered design.