New House Electrical Audit Before Move-In: 7 Mandatory Checks

I went through it myself at a Bekasi Utara cluster unit in 2024. New house, just moved in, everything looked fine. Month 3, the fridge died suddenly. Month 7, the water dispenser followed. Month 11, the master bedroom AC tripped the MCB three times a day. The on-call electrician came, checked, and said: "Sir, there's no grounding. The wire to earth is disconnected from the PLN pillar." Cost to install grounding properly: IDR 800K. Replace the fridge: IDR 4.5 M. Replace the dispenser: IDR 1.2 M. Total damage: IDR 6.5 million from a single point that should have been caught on day one.

Since then, every friend or neighbor receiving a new unit from a developer hears the same thing from me: don't move stuff in until the electrical audit is done. Below are 7 checks that independent electrical inspectors in Bekasi run (formal service IDR 750K – 1.2 M), but most can be done yourself with simple tools.

Tools Needed (Total IDR 350K)

Tool	Function	Price
Tespen / voltage tester	Check whether voltage is present in a wire	IDR 25–50K
Socket tester (3-LED)	Check polarity and grounding at outlets	IDR 80–150K
Digital multimeter (entry-level)	Measure voltage, ground resistance	IDR 120–200K
LED head torch	Access electrical panel and dark ceilings	IDR 30–60K

Optional tools for a deeper audit: clamp meter (IDR 250K, measures current per wire), megger / insulation tester (IDR 800K, usually rented from a professional), and thermal imaging camera (phone module IDR 1.8 M, detects hot spots in wire splices).

Check 1 — Outlet Polarity (15 Minutes, Every Outlet)

Outlets in Indonesia must follow PUIL 2011 standard (General Electrical Installation Requirements): live wire on the right, neutral on the left, grounding in the middle/top. Reversed polarity doesn't stop the appliance from working — but it shortens the lifespan of sensitive electronics (laptops, LED TVs, audio).

Fastest method: socket tester with 3 LED indicators. Plug into every outlet, read the LED pattern:

• Green-green-red (or the "correct" pattern per the device legend) = normal
• Red-green-red = live-neutral polarity reversed
• Green-off-off = grounding not connected (serious problem)
• All off = outlet has no power / wire broken

Test every outlet from ground floor to roof (if any). Note the pattern at each point. For an Emerald 70 house with LB 70 m², there are usually 18–24 total outlets.

Check 2 — Ground Resistance (10 Minutes, at Main Panel)

PLN standard (SPLN D5.005) for residential grounding: maximum 5 ohms. International standard IEC 60364: under 4 ohms. To check without a professional megger, use the 2-wire method with a multimeter:

1. Turn off the main MCB at the panel
2. Set the multimeter to resistance mode (Ω), 200-ohm range
3. One probe on the grounding wire (green-yellow at the panel), the other probe on a water pipe (which connects directly to earth)
4. Read the number. Under 5 ohms = safe. 5–20 ohms = grounding present but suboptimal. Above 20 ohms = grounding problematic

This method is an approximation, not an official measurement. For more accurate results, hire a megger service (IDR 350–500K, results next day).

Check 3 — MCB Sizing Per Group (15 Minutes, at Panel)

The MCB (Miniature Circuit Breaker) at the main panel must match the cable capacity in that group. An oversized MCB (too large for the cable) = fire hazard because the cable can overheat before the MCB trips.

PUIL 2011 standard for residential:

NYM cable	Max safe current	Recommended MCB	Common use
1.5 mm²	10 A	6 A or 10 A	Lighting group
2.5 mm²	20 A	10 A or 16 A	General outlet group
4 mm²	25 A	16 A or 20 A	AC + heavy kitchen group
6 mm²	32 A	20 A or 25 A	Water heater + pump group

Open the panel, read the MCB labels per group and the cable size feeding into them. If a 16 A MCB is installed on 1.5 mm² cable (lighting group), that's dangerous — replace the MCB with a 6 A or 10 A maximum. MCB replacement cost: IDR 35–80K per unit, plus IDR 100K installation.

Check 4 — ELCB / RCBO Functioning (5 Minutes)

The ELCB (Earth Leakage Circuit Breaker) or RCBO (Residual Current Circuit Breaker with Overcurrent protection) is a switch that trips automatically when there's current leakage to earth. Mandatory in every new home per Permen ESDM No. 38/2018 and PUIL 2011 article 4.7.

How to check: press the "TEST" button on the ELCB / RCBO body. If it works, the switch must trip in under 0.3 seconds. If pressing TEST doesn't trip the switch, the ELCB is broken or wired wrong. Replacement: IDR 250–450K.

If the panel only has MCBs (black) without ELCB / RCBO (usually white with a test button), the installation isn't to standard. Ask the developer to install ELCB before formal handover.

Check 5 — Wire Connections at Main Panel (15 Minutes)

Open the electrical panel cover (turn off the main MCB first for safety). Visual checks:

• Wire connections to every MCB must be tight. Wiggle slightly with a screwdriver — if loose, fix it
• No bare wires without insulation, no splices held together with electrical tape (must use terminal blocks or wire nuts)
• Grounding wires (green-yellow) must converge on a single bus bar that connects to earth
• No burn marks or blackened color around MCB terminals
• Group labels are clear (group 1: floor 1 lighting, group 2: floor 1 outlets, etc.)

Close the panel, then turn the main MCB back on. If anything's not right, photograph it and send to the developer for repair before signing off the handover.

Check 6 — Actual Voltage at Outlets (10 Minutes)

PLN nominal voltage is 220 V. PUIL tolerance: −10% to +5%, meaning 198–231 V. If measured voltage is consistently outside that range, possible causes:

• Voltage too low (< 198 V): voltage drop in the main cable from the PLN pillar to the house, the SR (House Service) cable is too small, or the run is too long
• Voltage too high (> 231 V): issue at the local PLN transformer, needs reporting to PLN

How to check: multimeter set to AC voltage, 750 V range. Probes into the 2 holes of an outlet (live and neutral). Test in the morning (9 AM), midday (1 PM), afternoon (5 PM), evening (8 PM). Note the readings.

Voltage that drops in the evening (when PLN load is high) is a common issue in Bekasi Utara. A drop under 10% is normal. A drop over 15% (under 187 V) puts electronics at risk. Solution: stabilizer (IDR 600K – 1.5 M per room) or report to PLN to audit the local substation.

Check 7 — Maximum Concurrent Load (15 Minutes)

Turn on simultaneously: 1 HP AC (900 W), 600 W water heater, 400 W washing machine, 200 W fridge, 1,800 W induction stove, 800 W microwave, full house lights 200 W. Total simulated load around 4,900 W.

For a 2,200 VA house (capacity 1,760 W usable), the main 10 A MCB will trip. For a 3,500 VA house (2,800 W usable), also trips. For a 5,500 VA house (4,400 W usable), still trips. For a 7,700 VA house (6,160 W usable), no trip.

This test isn't for daily use, but for mapping. If the MCB trips at a certain load, note it: "Bedroom AC + water heater + microwave together = trip." This guides the family's daily habits (e.g., avoid water heater and microwave together while AC is running).

For 2-storey Emerald 70 with stock PLN 2,200 VA, initial load simulation is in the article 2-storey house electrical needs.

Operational Worthiness Certificate (SLO) — Mandatory from Developer

Every new house's electrical installation must have an SLO (Sertifikat Layak Operasi) from a Technical Inspection Body (LIT) appointed by PLN. Without an SLO, PLN can legally refuse to energize the unit. Reputable developers always have the SLO sorted before handover — request a photocopy at signing.

SLO contains:

• Official certificate number (validity verifiable on Konsuil website or related LIT)
• Inspection date
• Inspection body name
• Inspector signature and official stamp
• Technical inspection results list (ground resistance, polarity, MCB sizing, etc.)

If the developer doesn't have an SLO or refuses to hand it over, that's a serious signal. The new owner can become liable if there's a fire because the installation isn't certified.

When to Hire an Independent Inspector

The DIY audit above filters basic issues. If any of the following apply, hire an independent inspector for IDR 750K – 1.2 M:

• Second-hand house older than 10 years (old installations may not meet new standards)
• DIY audit found > 3 serious issues
• No SLO or expired SLO (> 5 years)
• Planning many heavy appliances (>3 ACs, electric water heater, induction stove all together)
• There's been a small fire or short circuit in a neighboring area

The inspector arrives with a megger, thermal camera, and power quality analyzer. The result is an 8–12 page PDF report with photos, official measurements, and a prioritized repair list. For new houses, look for inspectors from Konsuil (Indonesian Electrical Consultants) or a PLN-listed LIT — not a regular on-call electrician.

Final 5-Minute Checklist Before Move-In

1. SLO is in hand, photocopy stored
2. Every outlet polarity and grounding is normal (socket tester shows green-green-red at all points)
3. ELCB / RCBO test button works as expected
4. MCB sizing per group matches cable (not oversized)
5. Outlet voltage is 198–231 V at the morning test
6. Ground resistance < 5 ohms (or via inspector megger reading)
7. Electrical panel is clean, connections tight, group labels clear

This 90-minute electrical audit also serves as a final negotiation tool with the developer. If repairs are needed, list them in the handover protocol — repair cost becomes the developer's responsibility, not the owner's. A signed handover protocol without these notes shifts post-move-in repairs to the owner.

For a broader handover guide, read how to read a Bekasi cluster site plan and combine this electrical audit with structural, drainage, and finishing inspections covered there.

What would have saved me IDR 6.5 million four years ago if I'd known earlier was just one step: a IDR 100K socket tester plugged into every outlet within 15 minutes. The result would have been visible immediately — dead grounding shows up on the socket tester long before the fridge dies in month 3.