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WISKA COMBI 310 Junction Box Explained

Electrical4less
Electrical4less

October 21, 2025

4 min

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Categories: Wiring Accessories Advice
Tags: Wiska Guides
Wiska 310 COMBI Junction Boxes – The New 3-Entry Addition to Wiska’s Trusted Range

Wiska COMBI 310 Junction Box Explained

Wiska COMBI 310 Junction Box Explained: this guide covers the dimensions, cable entries, IP protection and installation features of the COMBI 310. Designed for indoor and outdoor electrical connections, the enclosure offers flexible cable-entry arrangements, compact dimensions and versions with or without WAGO 221 connectors.

Wiska COMBI 310 Dimensions and Features

The COMBI 310 measures 117 × 85 × 51 mm externally. Its elongated design offers additional wiring space while remaining suitable for installations where enclosure dimensions are important.

  • External dimensions: 117 × 85 × 51 mm.
  • 10 × M20 threaded membrane cable entries, plus 4 rear entry positions.
  • IP66 protection using the specified membrane entries.
  • IP67 protection when suitable ESKV cable glands are correctly installed in the threaded entries.
  • Halogen-free, flame-retardant polypropylene construction with a TPE seal.
  • Quarter-turn captive cover screws for convenient access.
  • Available in white, light grey and black.

These features make the COMBI 310 suitable for a range of electrical connections, provided the enclosure, cable entries and internal components are selected for the particular installation.

Understanding the 10 Cable Entries

The Wiska COMBI 310 provides ten M20 threaded membrane entry positions and four additional rear entries. This offers flexibility when planning the direction of incoming and outgoing cables.

Not every entry must be used. Cable entries should be selected according to the cable diameter, sealing requirements and available internal space. Unused entries must retain the appropriate protection.

Understanding IP66 and IP67 Protection

IP66 indicates dust-tight protection against powerful water jets. IP67 includes protection against temporary immersion under specified test conditions.

Wiska specifies IP66 protection for the COMBI 310 when using the membrane entries correctly. IP67 protection can be achieved using the appropriate threaded entries with compatible ESKV cable glands, following the manufacturer’s instructions.

Always verify the complete installation arrangement. The standard COMBI 310 should not automatically be treated as IP68 rated or suitable for permanent immersion.

Empty COMBI 310 or Version with WAGO Connectors?

The COMBI 310 is available as an empty enclosure or in versions supplied with three 3-pole WAGO 221 lever connectors.

An empty enclosure allows suitable connectors and terminals to be selected for the installation. The connector-equipped version provides a convenient arrangement where the supplied connectors meet the required conductor sizes, current ratings and wiring configuration.

Always consider conductor compatibility, connector dimensions and internal wiring space before installation.

Wiska EC310 Earthing Clamp

The Wiska EC310 Earthing Clamp is a dedicated brass accessory for the COMBI 310. It provides three M20 × 1.5 threaded positions and is designed for compatible cable-entry arrangements.

Where protective earthing or cable-armour continuity is required, the complete termination arrangement must be suitable for the cable and installation. The EC310 should not be assumed to provide all necessary earthing functions without checking the manufacturer’s instructions.

Choosing Cable Glands and Accessories

The correct gland depends on the cable construction, outside diameter and required environmental protection. Different applications may require polyamide glands, suitable metal cable glands or specialist armoured cable termination arrangements.

Explore our Wiska polyamide cable glands and Wiska SWA brass cable glands, selecting only components suitable for the particular installation.

Where Can the COMBI 310 Be Used?

The COMBI 310 may be suitable for outdoor lighting connections, commercial wiring, electrical equipment connections and other installations where its dimensions, cable-entry options and environmental protection meet the requirements.

For comparison with alternative Wiska sizes, read our guide to choosing a Wiska COMBI junction box.

Official Wiska COMBI 310 Technical Information

For manufacturer specifications, available versions, dimensions and technical guidance, visit the official Wiska UK COMBI 310 product guide.

Frequently Asked Questions About Wiska COMBI 310

What size is the Wiska COMBI 310?
The Wiska COMBI 310 measures 117 × 85 × 51 mm externally.
How many cable entries does the COMBI 310 have?
The COMBI 310 provides ten M20 threaded membrane cable entries and four additional rear entry positions.
Is the Wiska COMBI 310 suitable for outdoor installations?
Yes, where its environmental protection and cable-entry arrangement meet the installation requirements. IP66 applies using the specified membrane entries, while IP67 requires appropriate compatible glands.
Does the COMBI 310 include WAGO connectors?
The COMBI 310 is available empty or in versions supplied with three 3-pole WAGO 221 lever connectors.
What colours are available?
The COMBI 310 is available in white, light grey and black.
What is the Wiska EC310?
The EC310 is a dedicated brass accessory suitable for the COMBI 310, with three M20 threaded positions. Its suitability for a particular earthing or cable-entry arrangement must be checked.

Explore the Wiska COMBI 310 Range

Compare available Wiska COMBI 310 junction boxes, colour options, connector-equipped versions and compatible accessories at Electrical4Less.

View Wiska COMBI 310 Range

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