Quoting a coaching-centre wiring job when the client wants to cut corners
You have registered a small proprietorship electrical contracting firm after completing your HS Vocational course and hold a Wireman's licence. A coaching centre asks for a quotation to wire a rented two-storey building: six classrooms, two toilets and one office. Scope: 12 fan points, 30 light points, 14 six-ampere socket points, 4 sixteen-ampere socket points for 1.5 TR air conditioners, one main distribution board with a 63 A four-pole isolator and a 30 mA RCCB, one sub-DB on the first floor, and a 25 m service connection from the meter board. The work must be finished in 14 days. Your material estimate at trade price is ₹88,000. You need one helper for 14 days at ₹550 a day, and you value your own time at ₹1,200 a day. You plan a 15 % margin on total cost, and GST on electrical installation services is 18 %. A rival has quoted ₹1,45,000. The owner asks you to drop the RCCB and use 1.5 mm² cable for the 16 A socket points so the price comes down.
1. Build the quotation from your cost figures and compare it with the rival's, then state how you would respond commercially without weakening the installation.
Read the worked answer
Direct costs. Materials ₹88,000. Helper: 14 × ₹550 = ₹7,700. Own labour: 14 × ₹1,200 = ₹16,800. Labour total ₹24,500. Direct cost = 88,000 + 24,500 = ₹1,12,500.
Margin. 15 % of ₹1,12,500 = ₹16,875, giving ₹1,29,375 before tax.
GST. 18 % of ₹1,29,375 = ₹23,287.50. Quoted price = ₹1,52,662.50, say ₹1,52,700.
Comparison. You are about ₹7,700 above the rival - roughly 5 %. That gap is small enough to discuss and too small to panic about.
Legitimate ways to close it. Ask your supplier for a project discount on the full material list, since ₹88,000 is a volume order. Phase the work: complete the ground floor and the essential circuits now, and quote the first-floor sub-DB as a separate second phase. Use a cheaper ISI-marked modular switch range instead of a premium one. Offer a payment schedule that improves your cash flow - 40 % advance, 50 % on completion of wiring, 10 % after testing.
What not to do. Do not reach the rival's number by deleting the RCCB or downsizing cable. If your direct cost is already ₹1,12,500, a ₹1,45,000 all-in price leaves the rival under ₹25,000 for margin, labour and tax, which suggests something in his scope is missing. Ask the owner to compare item by item, not totals.
2. Evaluate the owner's two requests - omit the 30 mA RCCB and use 1.5 mm² cable for the 16 A socket points - and give a defensible reply.
Read the worked answer
The RCCB request: refuse. A 30 mA residual current device on socket circuits is a life-safety requirement of standard wiring practice (IS 732 and the National Building Code), not an optional extra. Socket outlets are where portable appliances, extension leads and wet hands meet the supply. Removing it also removes your professional cover: your wireman's licence, your insurance and your reputation all attach to the certificate you sign. Tell the owner plainly: the RCCB stays, and if he insists on its removal you will decline the job and put the reason in writing.
The 1.5 mm² request: refuse, with numbers. A 16 A socket may be loaded with a 2 kW room heater at 230 V, drawing 8.7 A continuously, or a 1.5 TR air conditioner drawing about 7 A with a starting surge several times that. A 1.5 mm² PVC conductor carries roughly 14–17 A in ideal conduit conditions; after derating for a 40 °C classroom and grouping with other circuits it drops to around 12–14 A - below the rating of the 16 A device protecting it. That breaks the rule Ib ≤ In ≤ Iz: the breaker would not protect the cable. Voltage drop over a long first-floor run makes it worse. Minimum 2.5 mm² for the 16 A points, and 4 mm² where the run exceeds about 15–20 m.
The reply that keeps the customer. 'I cannot make it cheaper by making it unsafe. I can make it cheaper by phasing it.' Then offer the phased option from your cost sheet, presented as a saving rather than a refusal.
3. List what you must put in the written agreement before starting, and how you will close the job so that payment and your licence are both protected.
Read the worked answer
Before starting - the written scope. Name the exact number of points of each type, the cable sizes for each circuit, the makes and ratings of the DB, isolator, RCCB and MCBs, and the earth electrode arrangement with the resistance target. State what is excluded - civil chasing, plaster repair, furniture shifting, the utility's service connection charges - because disputes almost always come from the excluded items, not the included ones. Fix the price with GST shown separately, the payment schedule, the completion date and the penalty or extension terms for delay caused by the client.
Tenancy and permission. The building is rented. Get the owner's written consent to the work in the landlord's property, and keep a copy; an electrician who damages a rented structure without consent carries the liability personally.
Safety and statutory cover. Confirm the supply will be isolated by the utility or the consumer at agreed times, keep a first-aid kit and fire extinguisher on site, and check that the helper has been briefed on isolation and lock-off. Confirm your own accident cover.
Closing the job. On completion: insulation resistance test at 500 V on every circuit, earth electrode resistance measurement, RCCB trip-time test, polarity and CPC continuity checks - all recorded on a test certificate. Demonstrate the RCCB test button to the owner, hand over the certificate and a simple circuit chart, and get the client's signature on completion. Then raise the final invoice against the signed certificate. The document pack is what makes the 10 % retention collectable and what defends you if a fault appears six months later.