IP Ratings Explained: What Every Switchboard OEM Needs to Know

IP Ratings Explained: What Every Switchboard OEM Needs to Know

In modern switchboard manufacturing, enclosure integrity is non-negotiable. Electrical components are becoming more compact, higher-powered, and more sensitive to moisture, dust, and environmental contaminants. Whether you’re designing distribution boards for commercial buildings, industrial control panels, or outdoor metering cabinets, the protection level you specify directly affects compliance, safety, and equipment longevity.

And at the centre of enclosure integrity sits one key specification: the IP rating.

Choosing the right IP rating—and correctly matching it with the right hardware—is essential to meeting AS/NZS standards, preventing ingress-related failures, and ensuring your switchboard performs reliably throughout its entire service life.

What Are IP Ratings?

IP (Ingress Protection) ratings classify how effectively an enclosure prevents the intrusion of solids and liquids. Every rating consists of two numbers:

  • First digit (0–6): Protection against solids (dust, debris, tools, wires).
  • Second digit (0–9K): Protection against liquids (drips, sprays, jets, immersion).

Example:
IP65

  • 6 = Dust-tight
  • 5 = Protected against low-pressure water jets

For switchboard OEMs, understanding exactly what these numbers mean is essential for specifying compliant hardware and maintaining the enclosure’s certified protection level.

Why IP Ratings Matter for Switchboard OEMs

1. Compliance with AS/NZS 61439 and safety standards

Incorrect or mismatched hardware can invalidate the enclosure’s tested rating. Even a single low-spec hinge, lock, or gasket can compromise the entire assembly.

2. Preventing failure in harsh environments

Outdoor switchboards, rooftops, plant rooms, and dusty industrial facilities are unforgiving. Proper IP-rated hardware prevents:

  • Moisture ingress
  • Corrosion
  • Dust accumulation
  • Tracking and short circuits

3. Ensuring predictable long-term performance

Every switchboard needs consistent sealing pressure, repeatable torque, and weatherproof hardware that won’t degrade under UV, vibration, or daily operation.

4. Reducing warranty claims and maintenance

Ingress-related damage is one of the most common—and avoidable—causes of electrical equipment failure.

Understanding Common IP Ratings Used in Switchboards

Here’s a quick guide to typical requirements across industry installations:

IP Rating

 Use Case Protection Level

IP42

 Indoor, clean facilities Basic protection against fingers and dripping water
IP55 General commercial switchboards Dust-protected, resistant to water jets
IP65 Outdoor or industrial environments Dust-tight and protected from low-pressure jets
IP66 Exposed outdoor, coastal, washdown areas Dust-tight, powerful water jet protection
IP67 Critical installations Temporary immersion resistance

 

Selecting high-spec locking hardware is essential to maintain these ratings.

How the Wrong Hardware Can Fail an IP Rating

Even if the enclosure body is certified, these components can compromise the rating:

  • Non–weather-sealed locks
  • Hinges with unprotected pivot points
  • Poorly matched gaskets
  • Vents or cut-outs without appropriate sealing
  • Low-tolerance hardware that loosens under vibration

A common issue: compression locks being substituted with standard cam locks, instantly reducing sealing pressure and allowing water penetration during testing.

Where Selectlok Hardware Makes the Difference

Selectlok’s compression locks, quarter-turns, seals, and hinges are engineered specifically for electrical enclosures and switchboard applications.

1. Compression Locks (IP65–IP67 compatible)

Selectlok compression locks provide:

  • Uniform sealing pressure for consistent IP integrity
  • Vibration-resistant engagement ideal for industrial sites
  • PA6GF30, stainless steel, and zinc alloy options for corrosion resistance
  • Grip ranges from 1.5 mm to 25 mm to suit insulated and multi-layer panel designs
  • Quarter-turn, wing knob, T-handle and tool-operated variants

These locks prevent gasket relaxation, water ingress, and panel distortion—common issues with standard cam locks.

2. Weatherproof Quarter-Turn Locks

Designed for IP-rated enclosures, these provide:

  • Full rubber O-ring sealing
  • Dust and water protection
  • Easy tool-only access for authorised personnel
  • Lightweight or stainless steel options depending on application

3. Stainless Steel Hardware for Harsh Environments

316-grade components ensure durability in:

  • Coastal installations
  • Wastewater treatment sites
  • Food-grade and washdown areas
  • Outdoor switchboards exposed to UV and chemical attack

4. Sealing Profiles for Custom Switchboard Builds

EPDM and PVC profiles help OEMs maintain enclosure integrity even on large or non-standard panels.

Practical Tips for OEMs Specifying IP-Rated Hardware

✔ Match hardware materials to environment

  • 316 stainless steel for coastal zones
  • Zinc alloy / PA6GF30 for general industrial applications

✔ Select locks with adjustable compression

Ensures uniform sealing even when panel tolerances vary.

✔ Verify grip range

Incorrect grip is the #1 cause of failed IP tests.

✔ Use rear-fix hardware where possible

Reduces tampering and maintains clean external surfaces.

✔ Standardise hardware across your product range

Improves assembly consistency, testing predictability, and spare part logistics.

✔ Request CAD models early in design

Selectlok provides CAD files for all major lock styles to streamline switchboard layout and cut-out design.

Ideal Applications for Selectlok IP-Rated Hardware

  • Distribution boards
  • Main switchboards (MSBs)
  • Motor control centres (MCCs)
  • Metering enclosures
  • Rooftop HVAC control panels
  • Pump station controls
  • Battery storage cabinets
  • Solar PV switchboards
  • Temporary power boards

IP ratings are far more than a line in a technical specification—they are a core part of electrical safety and system reliability.

To maintain enclosure compliance, switchboard OEMs must choose hardware designed specifically for sealed, outdoor, and industrial environments. Selectlok’s range of compression locks, weatherproof quarter-turns, stainless steel hardware, and sealing profiles ensure switchboards achieve and maintain their certified IP rating throughout their operational lifetime.

When sealing, safety, and system integrity matter—Selectlok hardware delivers.

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