Preventive Electrical Maintenance in an Office Building — The Practical Guide for the Owner and the Property Manager

Of all the systems in an office building, the electrical system is the one that exacts the heaviest price for neglect — and it is precisely the one easiest to ignore. A stuck elevator is seen immediately, a leak leaves a stain, a broken air conditioner is felt within minutes. But a loose connection inside an electrical panel, an earthing that has lost continuity, or an RCD that no longer trips — all of these operate in complete silence, for months and years, until the moment they turn into a fire or an electrocution. That is why preventive electrical maintenance is not "another item in the maintenance plan" — it is the first line of defence for human life and for the property itself.

The sections below are based on practical experience managing buildings in Israel — not theory, but what actually happens in the field.

Why electricity is the No. 1 hidden fire risk in a building

Electrical fires do not start with a large flame. They start with a localised overheating — a connection that came slightly loose, a terminal that loosened over years of thermal expansion and contraction, a fuse working under too high a load, or insulation that aged and crumbled. This overheating accumulates quietly, chars the surrounding insulation, and at some point ignites it. All of this happens inside a closed panel, behind a wall, above a suspended ceiling — in a place no one looks at day to day.

What makes it especially dangerous is that there is no natural "early warning." Unlike a water system that starts to drip, or an air conditioner that starts to rattle, an electrical failure emits no signals a regular person picks up. The only detector that can catch it before the disaster is a proactive professional inspection — visual, electrical and thermographic. A building that does not perform these inspections is essentially gambling that none of its thousands of connections will start to overheat this year.

The risk intensifies in an active office building. Electrical loads keep growing — more workstations, more servers, more air conditioners, more chargers. Infrastructure designed 15 years ago carries today a load no one dreamed of, often without anyone checking whether the panels and cables are built for it.

A point from the field: one of the things you run into again and again in Israeli buildings — tenants who plug one power strip on top of another, add a mini-kitchenette with a kettle and a toaster oven to a circuit designed for lighting. No one asked the building manager. The panel didn't cry, the fuse didn't blow — and one circuit gradually operated at double the load. A thermography survey done a year later lit a red warning light on exactly that circuit.

The licensed testing electrician — a role you must not confuse

In Israel there is a fundamental distinction that many building owners miss: an electrician who installs and maintains is not the same person as a licensed testing electrician. Under the Electricity Regulations (Inspections), supervised by the Electricity Administration in the Ministry of Energy, the testing electrician holds a dedicated certification whose role is to examine an existing electrical installation, check it against the Electricity Regulations and issue an inspection report — a formal opinion on its soundness and its defects. He is not the one who fixes the defect; he is the one who locates it and attests to it independently.

This distinction is critical in terms of liability. When a licensed testing electrician goes over the installation and issues a report, an objective record is created that the installation's condition was examined by an authorised party. That report is exactly the document that an insurance company, a fire investigator or a court will ask to see if an incident occurs. Its absence — or an old report whose defects were not addressed — is among the first findings that come up in any inquiry.

What the inspector actually examines

• Electrical panels: the condition of the fuses, connections, circuit marking, the state of the enclosure and the arrangement of the protections.
• Earthing: the continuity of the earthing system and protection against dangerous touch voltages.
• Protective devices: the soundness of the RCDs and the array of protections against short circuit and overload.
• Insulation and cross-section matching: the state of the insulation and the suitability of the cables to the circuit load.
• Compliance with the regulations: examining the installation against the requirements of the relevant Electricity Regulations, including the requirements of Israeli Standard 900, which deals with fire protection in electrical installations.

The inspection frequency depends on the type of installation, its size and its classification, and is defined in the Electricity Regulations. The constant principle: a periodic inspection scheduled in advance, and not only "when something burns." See more on integrating the inspections into a management cycle in the annual preventive-maintenance checklist.

A tip from experience: it is worth asking the testing electrician to detail the defects by severity — critical, moderate, minor. That way you know what to address immediately and what can be scheduled into routine maintenance. A report that simply says "defects were found" without a breakdown is worth less.

The electrical panels — the heart no one opens

The main panel and the sub-panels are the junction through which all the electricity in the building passes, and are therefore also the most concentrated point of risk. Every fuse, every terminal, every busbar is a connection point that can loosen and heat up. In a loaded panel that has worked for years, the chance that one connection or more is not properly tightened is real.

Proper panel maintenance includes:

• Visual inspection of the state of the enclosure, signs of heating, pest damage (a common phenomenon in old panels in Israel) and moisture.
• Dust cleaning — dust is a thermal insulator and a moisture trap; in a dust-laden panel the heat does not dissipate properly.
• Tightening connections by an electrician — it turns out that in many buildings this is the single action that most reduces fire risk.
• Verifying circuit marking — an unmarked panel is a hazard in its own right in an emergency: fire crews and the emergency team expect to find a clear circuit map.

A point often neglected: cumulative load. As consumers are added to the building, some of the circuits approach the limit of their capacity. A periodic inspection identifies overloaded circuits before they fail, and allows an orderly expansion to be planned. This is also a matter the Fire and Rescue Authority takes an interest in during fire-insurance inspections — a building with loaded, undocumented panels will not be managed quietly over time.

The marking and management requirements for electrical panels also appear in the building-maintenance requirements under Israeli Standard 1525.

Earthing — the protection you don't see until you get shocked

The earthing system is the basic protection against electrocution. Its role is to ensure that if a leakage current is created — for example, insulation that broke down and connected voltage to a metal enclosure — the current is diverted to earth instead of passing through a person who touched the device. Sound earthing is what stands between a routine touch of an air conditioner or a metal railing and an electrocution.

The problem: earthing is an "invisible" system. It is buried, wired inside walls and panels, and no one notices when it loses continuity — a connection that eroded, a conductor that disconnected, an earthing electrode that corroded in the ground. The installation will keep working exactly as before, with no external sign, but the protection is no longer there.

The only way to know that the earthing is sound is to measure it — an earthing resistance and protective-conductor continuity test — and this is exactly one of the tests the licensed testing electrician performs, at the frequency set in the Electricity Regulations.

From the field: in buildings that underwent a partial renovation, it happens more than once that a renovation contractor disconnected an earthing conductor "temporarily" during work and did not reconnect it. Functionally everything works — until someone touches the wrong thing. Tenants who report a "slight tingling sensation" from an electrical appliance are a warning that the earthing must be checked immediately.

RCD (residual-current device) — the test that takes a second and saves lives

The RCD (also known as a Residual Current Device) is the device that cuts the power within a fraction of a second the moment it detects a leakage current to earth — exactly the situation of a person being electrocuted. It is one of the most important protective devices in any installation, but it has a fundamental weakness: over the years, the tripping mechanism can "stick" and fail to trip at the moment of truth. An RCD that does not trip is like a jammed airbag — it looks like it is there, but it will not protect when needed.

The way to verify that it is alive is simple: the test button on the device. Pressing it should cause the device to trip immediately. This is a test that takes seconds, requires no professional, and it is recommended to perform it at a fixed frequency. If the device does not trip when pressed — it is faulty and needs immediate replacement by an electrician.

Many ignore this test because "the power drops for a moment." That is a mistake: a second of inconvenience versus years of silent lack of protection. In an office building it is recommended to schedule the test as part of a monthly maintenance cycle, and to document it — so that there is evidence it was performed.

It is important to understand: the self-test does not replace the testing electrician's inspection — it complements it. The self-test verifies that the mechanism trips; the inspector's check examines that the device is suitable, properly installed, and protects what it is supposed to protect.

Emergency lighting and exit signage — the system that works only when everything collapses

Emergency lighting is a maintenance paradox: it is a system whose entire purpose is to operate exactly when the main power fails — in smoke, in panic, when people are trying to find their way out. And for that very reason it is also the system it is easiest to fail to notice is dead: in day-to-day life it does not need to work, so no one knows whether the batteries feeding it still hold a charge.

Emergency light fittings and illuminated "Exit" signs rely on backup batteries that wear out over time. An exhausted battery will give light for a few seconds and go out — or not light up at all. Proper maintenance therefore includes:

• Simulated outage test: disconnect the main power to that section and check that every fitting lights up and holds for the duration required by the standard.
• Visual inspection: integrity of the fittings, clarity of the exit signage, no physical damage.
• Documentation: who inspected, when, and which fittings were replaced.

Emergency-lighting and exit-signage requirements are defined, among others, in Israeli Standard 1118 (emergency lighting) and in the requirements of the Fire and Rescue Authority, and form an integral part of the building's fire-safety requirements. Non-compliance can delay a business licence for tenants and expose the building owner to direct liability.

Backup generator and UPS — power continuity in an emergency

In an office building, a power outage is not just an inconvenience. It shuts down elevators with people inside, disables safety systems, disconnects servers and can cause heavy business damage to tenants. That is why many buildings maintain two layers of backup: a UPS that covers the first moment with no interruption at all, and a generator that comes into operation and carries the load over time.

Generator — verifying that it really starts

The nightmare of every building manager: a generator that does not start at the moment of truth. A standing generator, even if seemingly sound, suffers from characteristic problems: a depleted starting battery, fuel that has aged (in diesel, after long months, microorganisms develop that foul the fuel system), a faulty cooling or charging system.

The only way to know that it will work is to run it — not "idle" but in a real load test that checks it carries the load it is supposed to carry. Such a periodic test, together with servicing the batteries, the fuel and the auxiliary systems, is the difference between a real backup and a piece of iron that reassures in vain.

From experience: it is worth scheduling the generator test in the early morning hours, before the building fills up. That way you identify a problem before it disrupts, and there is time to address it before evening. A generator last tested a year and a half ago is a generator the building manager does not really know.

UPS — the batteries are the weak point

In a UPS too, the weakness is the batteries. They are at the heart of the system, and they wear out at a known rate (usually 3–5 years in heavy use). A UPS with exhausted batteries will provide backup for seconds instead of minutes — and will not be enough to bridge until the generator comes up. Proper maintenance tracks the age of the batteries and replaces them in a planned way, before they fail.

Panel thermography — seeing the danger before it burns

This is perhaps the most important inspection that building owners are not familiar with. A thermographic inspection is a scan of the electrical panels with a thermal camera — a camera that sees heat instead of light. The loose connection that is starting to heat up, the fuse working at the edge, the terminal losing contact — all of these appear in the thermal image as a glowing hot spot, long before they turn into smoke or flame.

The main advantage: the inspection is non-intrusive and is performed while the system is working under load — exactly when the problems reveal themselves. There is no need to open walls, no need to disconnect circuits. The operator passes with the camera over all the panels within hours and produces a report with photos of every hot anomaly.

From the field: in a single scan carried out in a two-storey office building, three connections with an abnormal temperature rise were identified in the main panel — all due to insufficient tightening that accumulated over the years. Cost of repair: tightening and replacement of one terminal. Cost had they waited for the end: unknown, but in the direction of a burnt panel and a fire investigation.

In a multi-panel building, a periodic thermographic scan — usually once every one to two years — is one of the most powerful tools for reducing fire risk, and its cost is negligible against what it prevents.

Legal liability — when the fire traces back to a skipped inspection

This is the part building owners prefer not to think about — and it is exactly the part to think about in advance. When an electrical fire occurs, a fire investigator on behalf of the Police and/or the Fire and Rescue Authority enters the picture. One of his first questions — and the insurance company's after him — is: when was the installation last inspected, by whom, and what was in the report.

If it turns out there was a testing electrician's inspection that pointed to a defect that was not addressed, or that a periodic inspection was not carried out at all as required — this establishes negligence. The consequences:

• Insurance: an insurance company may reject or reduce a claim if it is proven the installation was not maintained as required.
• Civil liability: the building owner or its manager may be sued for tenants' property damage.
• Criminal exposure: in cases of personal injury — possible exposure under offences of negligence or failure to fulfil a legal duty.

An inspection report that sits in the archive, with defects that were addressed and documented, is not just a "form" — it is the building owner's legal defence. Its absence turns an unfortunate incident into one in which you both pay the price and are considered at fault for it.

And this is exactly the point where the Israeli culture of "we'll deal with it when it happens" fails badly. In electricity, "when it happens" is already too late — because what happens is a fire, not a fault to be fixed. The logic is the opposite: you invest in the cheap inspection in order to prevent the expensive incident.

How to manage all of this without missing a single inspection

The real difficulty in electrical maintenance is not technical but managerial. There are frequent self-tests (RCD), functional tests (emergency lighting, generator, UPS), periodic inspections by a licensed testing electrician (earthing, panels), and special scans (thermography) — each at its own frequency and by a different authorised party. Without someone who consolidates all of this into a single schedule, it is almost inevitable that one inspection will fall between the cracks. And in electricity, the inspection that falls is exactly the one that will be missing at the moment of truth.

• Unified schedule: every inspection — who performs it, at what frequency and when the next date is — in one table.
• Closing out defects: a defect that came up in an inspection report must be closed and documented — not "left for next time."
• Report archive: all inspector reports, thermography results and approvals — in one place, available to insurance and the authorities.
• Component-age tracking: emergency-lighting and UPS batteries, generator batteries — planned replacement before failure, not after.
• Documentation of self-tests: the monthly RCD test with a signature — evidence it was performed and not neglected.

This is exactly the difference between management that hopes the electricity is fine and management that knows it is fine and can prove it.

At Domera we schedule the testing electrician's inspections and the thermographic inspections in advance, verify the closing out of defects and keep all the reports consolidated — so that the building is protected in practice and protected legally. See comprehensive property management or get a quote.