- Design to CEA (Safety) Regulations 2010 — earthing, protection, isolation and safe kit.
- Earth everything per IS 3043: separate earth pits, equipment earthing, system earthing.
- Fit surge protection (SPD) and a lightning arrestor where the site needs one.
- Get a signed structural stability certificate (roof load, mounting, wind load).
- Size DC/AC cables correctly (4 sqmm is an example — verify against your design and labels).
PM Surya Ghar electrical and structural safety is where good jobs pass inspection and rushed jobs fail. The DISCOM joint inspection checks earthing, surge protection, isolation and the roof's structural certificate against CEA 2010. Build to the standard and the visit is easy.
What do the CEA (Safety) Regulations 2010 require?
The CEA (Measures relating to Safety and Electric Supply) Regulations 2010 set the safety rules for connecting rooftop solar to the grid. They cover earthing, protection devices, isolation and safe equipment. Your design must meet these rules, and the DISCOM checks them at the joint inspection.
Why CEA 2010 matters for the subsidy
The subsidy is paid only after commissioning and a passed inspection. If the install does not meet CEA safety rules, the DISCOM can hold the inspection, which blocks the net meter and the customer's payout. So safety compliance is not optional — it gates the money.
Confirm the current citations
CEA regulations and state CEIG (Chief Electrical Inspector to Government) requirements get amended. Confirm the current CEA citation and your state CEIG rules before you finalise a design, and do not rely on an old copy of the regulations.
How do you earth rooftop solar per IS 3043?
Rooftop solar earthing follows IS 3043, with equipment earthing of all metal parts and system earthing through separate, properly bonded earth pits. Good earthing gives faults a safe path to ground and protects people from shock.
Equipment earthing
Bond every metal frame, the mounting structure and the inverter body to earth. If a frame ever goes live from a fault, equipment earthing carries that current away safely instead of through a person.
System earthing and earth pits
Provide separate, properly bonded earth pits for the system, sized and built per IS 3043. Keep earth-pit photos and the earth-resistance reading, because the inspector checks both. Low, stable earth resistance is the proof your earthing works.
What lightning and surge protection is needed?
Rooftop solar needs surge protection devices (SPDs) and, where the site is exposed, a lightning arrestor. These protect the panels, inverter and wiring from voltage spikes and strikes, and the DISCOM commonly expects them for a safe grid connection.
- SPD on the DC side — guards the array and DC wiring against spikes.
- SPD on the AC side — protects the inverter output and the home wiring.
- Lightning arrestor — fit one where the roof or area is exposed to strikes.
Surge and lightning protection requirements vary with site and DISCOM. Confirm the exact requirement with your DISCOM and state CEIG before install.
What is the structural stability certificate?
The structural stability certificate confirms the roof can safely carry the solar array, covering roof load, the mounting structure and wind load. The DISCOM commonly wants this signed certificate at the joint inspection, so arrange it before you apply.
What the certificate covers
A qualified engineer assesses three things: the dead and live roof load with the array added, the mounting structure design and its fixing, and the wind load the structure must resist. The signed certificate is your proof the roof is safe.
Get it signed before inspection
Do not leave the structural certificate to the last day. Book the assessment early, fix any roof or fixing issues the engineer flags, and have the signed document ready in your inspection file. A missing certificate is a common, avoidable failure.
How do you size DC and AC cables and protection?
You size DC and AC cables for the system current and the cable run, then add matching protection. A 4 sqmm DC cable is a common example for many residential strings, but the right size depends on your design — always verify against the labels and standards.
DC side
Size DC cables so they do not overheat or lose too much power over the run. Protect the DC side with fuses or MCBs in the DC distribution box, rated to the array. Treat the 4 sqmm figure as an example to verify, not a fixed rule for every job.
AC side
On the AC side, size the cable to the inverter output and protect it with an MCB or RCBO in the AC distribution box. Correct sizing and protection on both sides is what lets a fault clear safely instead of starting a fire.
What isolation and disconnect does the system need?
The system needs DC and AC isolators so it can be switched off and made safe for maintenance. Labelled, accessible isolators let a technician or the DISCOM cut the system cleanly, and the inspector checks they are fitted.
The inverter must also stop exporting when the grid is down — the anti-islanding function. This protects line workers who may be repairing a dead line. Use a certified inverter and keep its certificate in your file.
Electrical and structural safety compliance checklist
Use this checklist to prepare every job for the joint inspection. Each row shows the item, the requirement or standard, the proof to keep, and why it matters.
Source: SuryaHub install notes based on CEA 2010 and IS 3043. Cable sizes and specific requirements are examples — verify the current CEA/CEIG citations and the 4 sqmm DC cable and structural-certificate norms for your state.
What does the joint inspection check for safety?
The DISCOM joint inspection checks earthing, lightning and surge protection, isolators, DC and AC protection, the structural stability certificate, and the inverter's anti-islanding behaviour. The inspector wants to see both the install and the paperwork that proves it is safe.
Prepare a clean inspection file: earth-resistance readings, earth-pit photos, the signed structural certificate, the inverter certificate, and a clear single-line diagram. Our pre-inspection checklist walks through exactly what to have ready.
Common safety failures — and how to avoid them
Most safety failures are avoidable. The same few issues fail inspections again and again.
- Weak or missing earthing — high earth resistance, or no separate earth pits.
- No surge protection — SPDs missing on the DC or AC side.
- Missing structural certificate — no signed roof-load assessment in the file.
- No isolators — DC or AC disconnects not fitted or not labelled.
- Undersized or unprotected cables — wrong sqmm, or missing DC/AC protection.
Fix these at the design and install stage, not on inspection day. A failed inspection delays the net meter and the customer's payout — see our joint inspection failures guide and the subsidy rejection reasons that follow.
Which safety documents should you keep on file?
Keep a small safety pack for every job, because the DISCOM and any later audit can ask for proof long after the system is live. The pack should hold the readings, certificates and test results that show the install met the CEA and BIS norms on the day it was commissioned.
The core safety documents
- Earth-resistance test report — the measured ohm value for each earth pit, signed and dated.
- Structural stability certificate — a chartered engineer's note that the roof carries the array, mounting and wind load.
- Single-line diagram (SLD) — the electrical layout from panels through inverter, protection and meter.
- Equipment test certificates — module and inverter compliance to the relevant BIS standards.
- Installation and commissioning report — what was fitted, the cable sizes, SPDs and isolators, with photos.
Store these against the job, not in a shared folder no one can find later. When the joint inspection happens, the inspector wants to see the earthing reading and the structural certificate quickly. A missing certificate is one of the most common reasons a safe install still fails the paperwork check. The exact list can vary by DISCOM — verify the current document set with your DISCOM and the National Portal.
When do you need Electrical Inspector (CEIG) approval?
Larger or higher-voltage systems can need approval from the state Electrical Inspectorate, often called the CEI or CEIG, before energisation. Small residential rooftop systems usually clear through the DISCOM joint inspection, but the threshold and the process vary by state, so confirm it early.
Why this matters for your timeline
CEIG approval can add weeks if you discover it late. For a home system under 10 kW, most states treat the DISCOM joint inspection as enough. For commercial sites, higher capacity or higher voltage, the inspectorate may want its own sign-off on the earthing, protection and isolation. Build that step into the schedule so the customer's net meter and subsidy are not delayed.
Always verify the state rule
The capacity and voltage that trigger CEIG approval are set by state rules under the Electricity Act and the CEA framework, and they change. Do not assume the threshold from one state applies in another. Verify the current CEIG requirement with your state Electrical Inspectorate and the CEA before you commit a commissioning date.
How SuryaHub helps you pass safety inspections
SuryaHub keeps the safety proofs for every job in one place — earth-resistance readings, the structural certificate, inverter certificates and the inspection checklist — so nothing is missing on the day. Our government workflows module tracks each job through inspection and commissioning, with reminders before the DISCOM visit. SuryaHub is pre-revenue; real pilots are Suryantra Energy and RGESPL, and the standards here are government requirements you must verify with CEA and your state CEIG.
Walk into every inspection ready
See how SuryaHub stores safety proofs and runs jobs through the joint inspection.
Related guides
Frequently asked questions
What does CEA 2010 require for PM Surya Ghar rooftop solar?+
CEA (Measures relating to Safety and Electric Supply) Regulations 2010 set the safety rules for connecting rooftop solar to the grid. They cover earthing, protection, isolation and safe equipment. The DISCOM checks these at the joint inspection. Confirm the current CEA and state CEIG citations before you finalise a design.
What earthing does PM Surya Ghar rooftop solar need?+
PM Surya Ghar rooftop solar needs earthing per IS 3043, including equipment earthing of metal frames and inverter, and system earthing through separate, properly bonded earth pits. The inspector checks earth pits and earth resistance. Always test earthing and keep the readings ready for the joint inspection.
Is a lightning arrestor mandatory for rooftop solar?+
A lightning arrestor and surge protection devices protect a rooftop solar system from strikes and voltage spikes, and the DISCOM commonly expects them for safe grid connection. Fit a surge protection device on the DC and AC side and a lightning arrestor where the site needs one. Confirm the requirement with your DISCOM.
What is the structural stability certificate for rooftop solar?+
The structural stability certificate confirms the roof can safely carry the solar array, covering roof load, the mounting structure and wind load. The DISCOM commonly wants this signed certificate at the joint inspection. Get a qualified engineer to assess the roof and sign it before you apply for inspection.
What DC cable size does PM Surya Ghar rooftop solar use?+
DC cable is sized for the system current and the cable run, and 4 sqmm is a common example for many residential strings. The correct size depends on your design, so always size cables to your load and verify against the actual labels and standards. Treat 4 sqmm as an example, not a fixed rule.
What does the DISCOM joint inspection check for safety?+
The DISCOM joint inspection checks earthing, lightning and surge protection, isolators, DC and AC protection, the structural stability certificate and the inverter's anti-islanding behaviour. Missing earthing, a missing structural certificate, or no isolators are common reasons an inspection fails. SuryaHub keeps these proofs ready for the visit.
Sources & references
Safety rules, earthing standards and the structural-certificate requirement come from primary government sources. CEA, CEIG and cable norms can change — always confirm the current citations and the 4 sqmm and structural-certificate requirements with CEA and your state CEIG.
- Central Electricity Authority (CEA) ↗
CEA (Measures relating to Safety and Electric Supply) Regulations 2010 and technical norms.
- Ministry of New & Renewable Energy (MNRE) ↗
Scheme technical guidelines for rooftop solar.
- National Portal for PM Surya Ghar ↗
Inspection and commissioning process.
Written by the SuryaHub team · reviewed against CEA, MNRE & National Portal sources · updated 19 June 2026.
Method: Safety rules and standards are taken from CEA 2010, IS 3043 and the government sources above, and re-checked every 30 days. Cable sizes and specific requirements are examples — verify the current CEA/CEIG citations. SuryaHub is pre-revenue; only Suryantra Energy and RGESPL are real pilots.
Change log: 19 Jun 2026 — first published.