India's lighting chains and decorative string lights market is enormous. Diwali, Christmas, weddings, religious festivals, corporate events — the demand for decorative lighting chains runs through the year, with massive seasonal peaks. Bhagirath Palace in Delhi and similar markets see hundreds of thousands of lighting chain units move in the festive season alone.
This market also has a troubling safety record. Fires started by defective lighting chains, electric shocks from poorly insulated connections, and child injuries from accessible live parts are among the most frequently reported product-related electrical accidents in India. BIS certification is mandatory for these products, and the 2026 revision of IS 10322 (Part 5/Sec 7) introduces the most significant new safety requirement this category has seen: formal provisions for Temporarily Installed Protected (TPL) lighting chains.
---This is the most significant new addition to the standard. TPL chains are lighting chains specifically designed and marketed for temporary outdoor installation — seasonal decorations for Diwali, Eid, Christmas, weddings, and corporate events.
The critical distinction between TPL chains and standard outdoor lighting chains is installation duration and method:
IS 10322 (Part 5/Sec 7): 2026 introduces specific requirements for TPL chains addressing:
Weather resistance for temporary outdoor use:TPL chains must be capable of safe outdoor operation for their specified installation duration even though they are not designed for permanent outdoor installation. The standard defines weather resistance requirements appropriate for temporary use — including rain resistance and protection against wind loading during installation.
Connector and junction safety:The connections between chain segments and between the chain and the supply connector are particularly safety-critical for lighting chains. For TPL chains, these connections must be designed for safe and easy assembly/disassembly repeatedly across multiple seasons.
Maximum installation duration:TPL chains must specify the maximum continuous outdoor installation period (e.g., 30 days, 60 days). Beyond this period, the chain must be inspected before continued use. The maximum installation duration marking must appear on the product.
Safe installation and removal:Requirements cover safe installation methods — including appropriate support, preventing tension on electrical connections, and ensuring the chain can be safely disconnected and stored.
Storage requirements:When stored between seasons, TPL chains must be stored safely — requirements address storage conditions that preserve the chain's safety properties.
Updated terminology has been added to clearly define:
This clarity helps manufacturers, importers, and consumers understand which product type they need and what it is rated for — reducing the dangerous practice of using indoor-rated chains outdoors.
All Part 1: 2026 changes apply — particularly EMF requirements, touch voltage limits, photobiological safety assessment, and updated marking requirements.
---Before diving into FAQs, it is worth explaining the safety context that drives these standards.
The most common safety failures in Indian lighting chains are:
Accessible live parts: Cheap chains use exposed lamp holders where the metal contact parts are accessible to fingers. During installation, connecting segments, or replacing bulbs — contact with live parts causes electric shock. Overheating connectors: Lighting chains carry current through multiple segments connected in series or parallel. Poorly designed connectors have high resistance at the contact point, causing localised heating that melts insulation and starts fires. Inadequate insulation: Cable insulation on cheap chains is too thin, has insufficient voltage rating, or is made from materials that become brittle in cold weather or degrade in outdoor UV exposure. Cracked insulation exposes live conductors. Excess current: Chains are often connected in multiples — multiple chains plugged end-to-end, drawing total current that exceeds the rating of the cable or connectors. This overloads the wiring and causes fire. Missing or inadequate fusing: Quality chains include fuses in the plug or inline to protect against overload and short circuit. Cheap chains omit fusing entirely.The BIS requirements address all of these failure modes. Compliance testing verifies that certified products are safe against these specific risks.
---Yes. Indoor LED lighting chains are covered under IS 10322 (Part 5/Sec 7): 2026 and require mandatory BIS CRS certification regardless of whether they are used indoors or outdoors.
The distinction between indoor and outdoor in this standard is about the construction requirements — outdoor products must meet higher weather resistance requirements. But both indoor and outdoor products require BIS certification.
There is no exemption for decorative indoor lighting chains. Products sold without BIS CRS certification are illegal regardless of the end use.
If your product is sold as a continuous reel for cutting to length — the certification covers the product as tested. The test covers a specified length of chain with end terminations as supplied.
The challenge with cut-to-length products is that the end customer creates their own terminations — potentially without the fusing, insulation, and connector quality that the certified product includes. BIS certification covers the product as you supply it, not as the end user modifies it.
If you supply reels without end connectors (bare wire ends), the product as supplied may not have a complete circuit for testing purposes. Discuss your specific product format with our team before submitting for testing.
IS 10322 (Part 5/Sec 7): 2026 does not specify an absolute maximum number of connected segments — but the number of segments that can be connected safely is limited by the current-carrying capacity of the cable and connectors.
Products must be marked with the maximum number of sets that can be connected end-to-end. This number must be determined by testing — connecting more than the rated maximum and verifying that temperatures, currents, and voltages remain within safe limits.
Connecting 20–30 chains when the product is rated for, say, 5 connections is a serious safety violation that can cause overheating, fire, and supply breaker trips. Retailers who sell chains often advise customers on this, but the marking requirement ensures the information is on the product itself.
When testing at House of Testing, we will help you determine the maximum connected sets for your specific chain design based on cable cross-section, connector rating, and total power per segment.
Fusing requirements are specified in IS 10322 (Part 5/Sec 7): 2026. The fuse in the supply plug (or integrated controller) must:
The fuse must be of a specified type and rating — generally a small HRC (High Rupturing Capacity) fuse for electronic products, not a wire fuse. The test verifies that the fuse operates correctly under fault conditions — it must blow before any cable reaches a temperature that could cause insulation damage.
Many cheap imported chains use no fuse at all, or use incorrect fuse ratings. Our testing verifies fuse operation as part of the fault condition test.
CE marking for European market covers IEC 60598-2-20 requirements which is the same international standard basis for IS 10322 (Part 5/Sec 7): 2026. Technical requirements are substantially similar.
Differences in Indian BIS requirements:
The practical approach: leverage the technical content of the CE test where parameters are equivalent, and have a BIS-recognized laboratory verify compliance with the specific IS 10322 (Part 5/Sec 7): 2026 requirements including any India-specific differences.
Can you sell an outdoor-rated permanent chain as a temporary decoration? Yes — you are applying a more robust product to a less demanding application. The reverse — selling a TPL-rated chain as a permanent outdoor installation — is not appropriate as the TPL chain may not meet the durability requirements for permanent installation.
In practice, most of what is sold in India for festival and wedding use is intended as TPL use. The new 2026 standard provides a formal certification pathway for this product type that did not previously exist.
Yes. If your lighting chain includes a wireless remote control:
The wireless module (whether RF, IR, Bluetooth, or Wi-Fi) adds a separate regulatory requirement beyond BIS. If your product is sold with a remote control, both the BIS certification and the WPC/ETA must be in order.
This is a significant compliance complexity that many importers of smart decorative lighting overlook. Contact House of Testing for guidance on the complete compliance pathway for wireless-controlled lighting chains.
The most common fire causes from lighting chains and how they are addressed:
Connector overheating: Addressed through current-carrying capacity testing of connectors. BIS testing verifies that connector temperatures remain within safe limits at rated current, and that connector contact resistance is within specified limits. Cable overloading (too many chains connected): Addressed through the "maximum connected sets" marking requirement and testing at the maximum rated connected configuration. Short circuit without fuse: Addressed through the mandatory fuse requirement and fault condition testing — the fuse must operate before cable or connector reaches dangerous temperature. Damaged insulation: Addressed through mechanical testing (bend test, torsion test) verifying insulation integrity under handling stress, and through insulation resistance measurement verifying that insulation provides adequate separation. Lamp holder with accessible live contacts: Addressed through the accessible parts test — the standard test finger must not be able to contact live parts in any position of the lamp or during bulb replacement.The comprehensive test matrix in IS 10322 (Part 5/Sec 7): 2026 addresses all these failure modes. A chain that passes BIS testing has been verified against the most common failure causes.
This is one of the most common design failures for lighting chains — particularly those using conventional E10 or E12 screw-base miniature lamp holders.
Solutions:
Option 3 or 4 (moving away from replaceable lamp designs) is the most commercially practical solution for most manufacturers, and aligns with the direction of the market toward integrated LED designs.
The maximum installation duration is not set by the standard at a specific number of days — you as the manufacturer specify it, and the standard requires it to be marked.
The duration you specify must be supported by your product design and testing. If you declare a 60-day maximum installation duration, your product must be designed to maintain safe operation (insulation integrity, connector performance, IP protection) for that duration of continuous outdoor exposure.
The practical constraints are:
Most quality TPL chains can realistically specify 30–60 days maximum outdoor installation. Premium chains with better UV-resistant materials and more robust connectors can extend this.
The maximum installation duration you declare becomes part of your BIS certification and must be marked on the product. Testing at House of Testing will help validate the duration you intend to declare.