An electrical AMC is a structured, scheduled inspection program. It is not a repair contract (you still pay for parts and major repairs when needed), and it is not an on-call emergency service - though most AMC providers, including us, give AMC clients priority response for breakdown calls. The value of an AMC is in finding problems before they stop production.
This guide is aimed at factory owners, facility managers and commercial property owners in Chh. Sambhajinagar (Aurangabad) who are either evaluating their first AMC or reviewing an existing one. We cover what a visit should actually include, what reasonable cost looks like in this market, and the questions worth asking before you sign.
What a factory AMC visit should cover
A visit that takes 20 minutes and checks three things is not an AMC - it is a token visit. A proper factory electrical AMC visit, done by a qualified engineer with test instruments, should cover the following:
1. Panel inspection
The main incoming panel and all sub-panels should be inspected visually (door seal, cable entry glands, label condition) and with instruments. Thermal imaging or an IR gun identifies hot spots at bus bar joints, MCB/MCCB terminals and contactor connections. A hot spot with a delta-T above 20 degrees C is a loose connection waiting to cause a fault. All readings should go into the visit report.
2. Motor health check
For factories with three-phase induction motors, each motor should be checked for: current draw on all three phases (clamp meter, not visual), body temperature, abnormal vibration or sound, overload relay setting versus nameplate FLA, and phase failure relay presence and setting. Voltage imbalance and current imbalance should be measured and logged. A 5% voltage imbalance can cause 40% current imbalance in motor windings - this is the most common cause of motor winding failure in MIDC factories and it is completely preventable.
3. Earthing verification
Earth pit resistance should be measured with a calibrated earth resistance tester (three-point method), not estimated visually. IS 3043:2018 requires industrial earth pit resistance below 1 ohm. If this has never been measured since installation, it needs to be. Salt and charcoal in the pit degrade over time - resistance drifts up without any visible change.
4. Protection device testing
Every RCCB and ELCB should be tested by pressing the test button and confirming it trips. An RCCB that does not trip on test has failed - its residual current sensing element has degraded. This is a safety issue and a compliance issue. Overload relay settings should be verified against motor nameplates. Contactor contact conditions should be checked for pitting or carbonization.
5. Load measurement
Total connected load, current per phase and power factor (where a meter is available) should be logged. Phase imbalance should be noted. This data builds a baseline over visits - a sudden increase in current draw or a shift in phase balance is a useful early warning.
6. Written report
Every AMC visit should end with a written report that includes the observations, the instrument readings and the recommended corrective actions (with a clear priority: immediate, within 30 days, at next scheduled shutdown). A verbal summary is not a report. The report matters for your own records, for insurance purposes and for handing over to a new facility manager.
Visit frequency: monthly vs quarterly vs half-yearly
The right visit frequency depends on how critical your electrical infrastructure is and how old or loaded it is:
- Monthly visits - suited for facilities with continuous production that cannot afford downtime, high-value equipment, or older installations with a history of failures. Hotels with generators and large kitchen loads benefit from monthly visits.
- Quarterly visits - the standard for most MIDC factories. Four visits per year means no element of the installation goes more than 90 days without a check. This is enough to catch most developing faults before they cause production loss.
- Half-yearly - reasonable for smaller commercial premises with a simpler installation and low critical load. The minimum we recommend for any three-phase premises.
What a factory AMC costs in Chh. Sambhajinagar
AMC pricing varies with connected load, panel count, motor count and visit frequency. Some rough benchmarks for the Chh. Sambhajinagar market:
- Small factory (up to 50 HP total load, 1-2 panels, quarterly visits): roughly Rs 20,000 - 35,000 per year.
- Medium factory (50-150 HP, 3-5 panels, MCC, quarterly visits): roughly Rs 35,000 - 70,000 per year.
- Hotel or commercial building (3-phase, generator, kitchen load, monthly visits): roughly Rs 30,000 - 60,000 per year.
- Housing society (common area, pump, lift, generator, quarterly): roughly Rs 15,000 - 30,000 per year.
These ranges are indicative. The actual quote depends on a site survey. We do not quote AMC costs without first understanding what is on site. Anyone who gives you a price without a site visit is either quoting something generic or will revise it significantly once they see the installation.
Questions to ask before signing an AMC
Not all AMC contracts are equivalent. These questions help separate a genuine maintenance program from a contract that exists mainly on paper:
- Who comes on the visit? A qualified engineer with test instruments, or a technician who does a visual walk-around? For a factory, you want an engineer who can interpret readings.
- What instruments are used? Thermal imaging gun or camera, clamp meter, earth resistance tester, insulation resistance tester (megger). If none of these are part of the visit, it is not a technical inspection.
- Do you get a written report after each visit? And does it include actual measured readings, not just "checked and OK"?
- What happens with emergency breakdown calls? Is there a priority response commitment for AMC clients? What is the response time for a production-stopping fault?
- What is excluded? Parts, major repairs and third-party equipment (generator service by the OEM, for example) are typically excluded. This is normal - understand the scope clearly.
- Are IS standards referenced in the contract? IS 732 for wiring, IS 3043 for earthing, IS 5216 for safety. A provider who works to Indian Standards will reference them; one who does not may not know them.
When an AMC clearly pays for itself
For any factory where a production-stopping fault costs more per day than the annual AMC cost, the AMC pays for itself the first time it catches a developing fault before it fails. For a factory that loses Rs 50,000 of production per day when down, a Rs 30,000 annual AMC cost is recovered in less than one prevented downtime event per year.
The Marathi guide on AMC versus breakdown repair cost comparison goes through this calculation in more detail. For MIDC factories specifically, the motor health guide on why motors burn out explains the specific failure modes that a well-run AMC catches before they cost you a rewinding bill and three days of production loss.
We cover Waluj MIDC, Shendra MIDC, Chikalthana and nearby areas for factory AMC work. Details of what our annual maintenance contract includes and how to request a quote are on the service page.
