The short answer
The right sliding gate motor is one rated well above your gate's actual weight, not just equal to it. A motor running near its limit works harder on every cycle, overheats sooner, and wears its gears faster. In Singapore's heat and humidity, that shortens its life even more.
As a rough guide, here is how NICE's sliding gate range lines up by gate weight:
- Up to 400 kg (light aluminium or slim steel residential gates): Slight, Naked Sliding 400 or Robus 400.
- 400–800 kg (most landed-home steel gates): Robus 600 or Robus 800.
- 800–2,500 kg (heavy residential, commercial and factory gates): Robus 1000, Run 1500, Run 1800 or Run 2500.
- Above 2,500 kg (large industrial and logistics gates): Tub 4000.
Weight is only the starting point, though. Gate length, how often it opens each day, the condition of the track, and whether you need battery backup all affect the final choice. This guide walks through each factor so you can understand what your installer is recommending, and why.
PCM Electrical Engineering has been NICE's authorised distributor in Singapore since 1996. The advice below comes from sizing and servicing NICE sliding gates across homes, condominiums, factories and government sites for nearly three decades.
Step 1: Estimate your gate's weight and length
Most homeowners have no idea what their gate weighs, and guessing low is the most common sizing mistake. Gate weight depends on material, size and design, so two gates of the same size can differ by hundreds of kilograms.
What drives gate weight
- Material. Steel is about three times heavier than aluminium for the same volume (steel weighs roughly 7,850 kg per cubic metre; aluminium about 2,700 kg). A wrought-iron or mild steel gate is far heavier than an aluminium one that looks similar.
- Infill. Solid sheet panels add much more weight than open vertical bars. Timber-look cladding, perforated panels and privacy screens all add weight too.
- Size. A double-width driveway gate of 6–8 m carries far more steel than a single 4 m gate.
- Extras. Decorative castings, a built-in pedestrian door, and thick paint or powder coating all count.
A worked example
Take a 5 m long, 1.8 m tall mild steel sliding gate, a common size for landed homes in Singapore:
Part | Approximate calculation | Approximate weight |
|---|---|---|
Outer frame (50 × 50 × 2 mm hollow section) | 13.6 m of section × about 2.9 kg/m | 40 kg |
Vertical bars (25 × 25 × 1.6 mm, about 120 mm apart) | about 75 m of bar × about 1.1 kg/m | 85 kg |
Full 2 mm steel privacy sheet (optional) | 9 m² × 0.002 m × 7,850 kg/m³ | 140 kg |
With open bars only, this gate weighs roughly 125–150 kg. Add a full privacy sheet and it climbs to around 270–300 kg. That is double the weight, for a gate that looks almost the same from the road. These figures are approximate; real gates vary with design and fabrication.
Get it measured properly
The most reliable method is to ask your fabricator for the gate's design weight, or have an installer check it on site. An experienced technician can also judge how freely the gate moves by pushing it by hand. A gate that is hard to push will need a stronger motor, whatever its weight on paper.
Also measure the leaf length (the width of the moving gate). Each motor has a maximum length as well as a maximum weight, and long gates need more force to start and stop smoothly.
Step 2: Match the weight to a NICE motor
NICE builds sliding gate motors in clear weight classes, from compact 400 kg units to industrial motors rated for 4 tonnes. The table below lists the maximum gate weight for each model. Treat these as upper limits, not targets.
NICE motor | Max gate weight | Power supply | Best suited for |
|---|---|---|---|
Slight | 400 kg (leaf up to 6 m) | 24 V | Light residential gates; compact budget-friendly option |
Naked Sliding 400 | 400 kg (leaf up to 6 m) | 24 V | Homes wanting a hidden motor installed inside a gate post |
Robus 400 | 400 kg | 24 V | Light to medium residential gates, frequent daily use |
Robus 600 / 600 HS | 600 kg | 24 V | Typical landed-home steel gates; HS version opens faster |
Robus 800 | 800 kg (leaf up to 8 m) | 24 V | Heavier or longer residential gates |
Robus 1000 (previous generation) | 1,000 kg | 24 V | Heavy residential and light commercial gates |
Run 1500 | 1,500 kg | 24 V | Commercial premises and condominium entrances |
Run 1800 / Run 2500 | 1,800 kg / 2,500 kg | 230 V | Factories, warehouses and intensive-use sites |
Tub 4000 | 4,000 kg | 400 V three-phase | Large industrial and logistics gates |
The new Robus range is NICE's current core residential line. It covers gates from 400 to 800 kg, adds a Hi-Speed version, and connects to NICE's smart home ecosystem for app control. Its sealed body and magnetic limit switches also help keep out insects and debris, a real advantage in Singapore, where ants nesting in control boxes are a common cause of breakdowns.
If you have an older Tub 3500, note that NICE has discontinued it; the Tub 4000 is its current replacement. Spare parts for discontinued models become harder to source over time, which matters when you weigh repair against replacement.
Why you need headroom above your gate's weight
A motor rated for 600 kg can technically move a 600 kg gate, but not as often, and not for as long. NICE's own Run installation manual shows this clearly. The motor can run at 100% of its rated work cycle on light gates, but the permitted cycle percentage drops steeply as the gate gets heavier. Near the top of the Run 2500's range, it falls to just 30%.
In practice, this means a motor working near its limit should open and close the gate fewer times per hour, and it will wear out sooner. As a rule of thumb, PCM sizes motors so the gate weighs well below the motor's maximum, with more headroom for busy sites. [PCM: confirm the exact margin your technicians use, for example 25–30%, before publishing.]
Step 3: Check the factors beyond weight
Two gates of the same weight can need different motors. These five factors often decide between two models in the same weight class.
1. How often the gate opens
A landed home might open its gate 10–20 times a day. A condominium, school or factory gate can open hundreds of times. Busy gates need a motor built for intensive use, and more headroom above the gate's weight, as explained above. If several cars come and go at the same times each morning and evening, plan for that peak, not the daily average.
2. 24 V or mains-powered motors
- 24 V motors (Slight, Naked, Robus, Run 1500) run at low voltage. They start and stop more smoothly, handle frequent use well, and can run on backup batteries during a power cut.
- 230 V and 400 V motors (Run 1800 and 2500, Tub) deliver the raw power needed for very heavy industrial gates. The heaviest models need a three-phase supply, which most homes don't have.
For most homes in Singapore, a 24 V motor is the better choice.
3. Power failure backup
If your gate is the only way in or out of your property, think about what happens during a power cut. Many NICE 24 V motors accept an optional backup battery that keeps the gate running for a limited number of cycles. Every NICE motor can also be released by key so the gate can be pushed by hand.
4. Track condition and slope
A sliding gate must run on a level, clean track. A bent track, worn wheels or a slight slope can make a 300 kg gate feel like 500 kg to the motor. Before fitting a new motor to an old gate, have the track, wheels and rack checked. Fixing the track is often cheaper than buying a bigger motor to fight it.
5. Speed and safety features
Hi-Speed (HS) versions open faster, which is useful on busy roads where cars wait outside. Whatever the speed, the system should include safety photocells, which stop and reverse the gate if something is in its path. This is especially important in homes with young children or pets.
Which motor suits your property?
Property type | Typical gate | Usual NICE choice | Why |
|---|---|---|---|
Terrace or semi-detached house | 150–400 kg, 3–5 m | Robus 400 or Robus 600 | Smooth 24 V operation, battery backup option, plenty of headroom |
House wanting a clean, hidden look | Up to 400 kg, up to 6 m | Naked Sliding 400 | Motor sits inside a slim post instead of beside the gate |
Bungalow or Good Class Bungalow | 400–800 kg, 5–8 m | Robus 600 HS or Robus 800 | Handles heavier, longer gates; HS opens quickly on busy roads |
Condominium or office entrance | 600–1,500 kg, high daily use | Robus 1000 or Run 1500 | Built for frequent cycles throughout the day |
Factory, warehouse or logistics yard | 1,500–4,000 kg | Run 1800, Run 2500 or Tub 4000 | Industrial duty, heavy gates, long leaves |
These are typical starting points, not fixed rules. A site survey is the only way to confirm the right model, because track condition, slope, power supply and traffic all vary. You can browse PCM's full range of sliding autogates to see each motor in detail.
Five mistakes to avoid
- Buying a motor rated exactly at your gate's weight. It will work at first, then wear out early. Always leave headroom.
- Guessing the weight. Adding a privacy sheet, cladding or a pedestrian door can double a gate's weight. Get the real figure from your fabricator or installer.
- Ignoring the track. A new motor cannot fix a bent track or worn wheels. It will simply strain against them until it fails.
- Choosing an unbranded motor to save money. Cheaper unbranded motors can be hard to repair because spare parts and technical support are not available locally. With NICE, an authorised distributor can supply genuine parts for years.
- Skipping the safety devices. Photocells and proper force settings protect people, pets and cars. They should be part of every installation, not an optional extra.
Frequently asked questions
What size motor do I need for a 500 kg sliding gate?
A 500 kg gate is above the 400 kg class, so it needs at least a Robus 600. For a busy gate or one with a long leaf, a Robus 800 gives more headroom and a longer service life.
Can I fit a new motor to my existing sliding gate?
Usually, yes. Most sliding gates can be automated or have their motor upgraded, as long as the track, wheels and gate structure are in good condition. An installer will check these first, and may recommend fixing the track before fitting the motor.
Will my sliding gate work during a power cut?
It depends on the motor. Many NICE 24 V motors can take an optional backup battery that keeps the gate working for a limited number of cycles. Without a battery, you can unlock the motor with its release key and slide the gate by hand.
How long does a NICE sliding gate motor last?
With correct sizing and regular servicing, a quality motor can last many years. The two biggest factors are how close the gate's weight is to the motor's limit, and how well the track and wheels are maintained. [PCM: add your typical service life figure from experience.]
Is a concealed motor as strong as a standard one?
The NICE Naked Sliding 400 is designed for gates up to 400 kg and 6 m. It suits lighter residential gates where appearance matters. For heavier gates, a standard Robus or Run motor is the right choice.
Do sliding gate motors need maintenance?
Yes. Servicing every 6 to 12 months keeps the rack, wheels, track and safety devices working properly, and catches small problems before they damage the motor. Busy commercial gates need more frequent checks.
Get the sizing right the first time
Choosing a sliding gate motor comes down to three things: know your gate's real weight, pick a motor with headroom above it, and check the track, usage and power needs before you buy. Get those right, and a NICE motor will give you years of smooth, reliable service.
PCM Electrical Engineering has supplied, installed and serviced NICE gate systems in Singapore since 1996, for homes as well as sites such as Changi, Gardens by the Bay and Singapore Airlines. If you're unsure which motor suits your gate, our technicians can assess it on site and recommend the right model. Contact PCM to arrange a site survey.
