Outdoor Wiring Made Easy: WISKA WAGO and Storm Glands

How to Waterproof Outdoor Electrical Connections – Wiska, WAGO and Storm Glands

Understanding how to waterproof outdoor electrical connections is essential when installing garden lighting, exterior power circuits, security equipment and other electrical systems exposed to the weather. The right combination of an enclosure, cable glands and connectors can help protect electrical terminations against moisture and environmental damage. This guide explains how Wiska COMBI junction boxes, Storm Glands and WAGO connectors can be used together, along with practical installation tools and accessories.

Why Do Outdoor Electrical Connections Need Protection?

Outdoor electrical installations face conditions that can affect the reliability of connections, including rain, moisture, temperature changes, ultraviolet exposure and mechanical stress.

Water entering an enclosure can contribute to corrosion, deterioration of electrical connections and insulation problems. Selecting a suitable enclosure and installing the correct cable entries are therefore essential parts of the overall installation.

Protection should be considered as a complete system. Even a high-quality junction box can be compromised by an unsuitable gland, damaged seal, incorrect cable arrangement or poorly secured cover.

1. Wiska COMBI Boxes – Protecting Outdoor Wiring

Wiska COMBI junction boxes are commonly used for suitable indoor and outdoor electrical connections. The range offers different enclosure sizes, colours and cable-entry arrangements.

Many COMBI models use polypropylene construction with sealing gaskets and convenient membrane cable entries. Selected versions are also available with pre-supplied connectors or alternative installation accessories.

Understanding IP66 and IP67 Protection

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

Wiska specifies IP66 protection for many COMBI boxes when their designated membrane entries are used correctly. IP67 can be achieved on compatible models using suitable cable glands installed according to Wiska’s instructions.

The complete installation determines the protection achieved. Standard COMBI enclosures should not automatically be considered suitable for permanent immersion or direct burial.

Mounting a Wiska COMBI Box

Use the designated mounting points or compatible mounting accessories specified for the individual COMBI model. Avoid drilling additional holes through enclosure walls unless the manufacturer expressly permits the modification and specifies how protection is maintained.

Position the enclosure so cable entries are accessible, seals are protected and future inspection can be carried out where required.

For help comparing enclosure sizes, read our guide to choosing the right Wiska COMBI junction box.

2. Storm Glands – A Cable-Entry Option for SWA

Storm Glands are a specialist cable gland range from SWA, designed for compatible armoured and selected other cable types. Their design aims to simplify installation while providing a suitable cable-entry and termination arrangement.

The manufacturer specifies IP68 protection for the Storm range, alongside UV-stabilised, corrosion-resistant construction and compatibility with various cable types. The correct gland must still be selected for the particular cable size and construction.

• Designed for faster fitting using a purpose-designed gland construction.
• IP68 rating under the manufacturer’s specified conditions.
• Suitable for selected SWA, non-armoured and braided cable arrangements.
• Available in different metric sizes to suit particular cables and enclosure entries.
• Includes gland accessories according to the selected product specification.

Storm Glands should not be assumed to fit every SWA cable. Check the exact gland size, cable outside diameter, armour characteristics, earthing arrangement and manufacturer’s fitting instructions.

For product specifications and fitting guidance, visit the Storm Cable Glands information from SWA.

Wiska E-SPRING Earthing Accessories

The Wiska E-SPRING20 is an earthing accessory designed for suitable M20 cable-gland arrangements. Wiska supplies the E-SPRING system with an earth lead and associated fixing components for compatible installations.

It can provide a convenient earthing connection where specified by the manufacturer. Always verify the complete SWA termination and protective conductor arrangement; the accessory should not be treated as a universal remedy for missing or incorrectly installed earthing.

3. WAGO 221 Connectors – Reliable Cable Connections

WAGO 221 lever connectors are a convenient option for connecting suitable conductors inside an appropriately selected enclosure.

The lever-operated design allows compatible conductors to be inserted and released without using a conventional screw terminal. Individual connector ratings and permissible conductor sizes must be checked before installation.

• WAGO 221-412 – two-conductor lever connector.
• WAGO 221-413 – three-conductor lever connector.
• WAGO 221-415 – five-conductor lever connector.

WAGO 221 connectors are not themselves waterproof. Suitable protection must be provided by an appropriately rated enclosure or an approved sealing arrangement.

4. WAGO 207 Gelboxes – Additional Moisture Protection

WAGO Gelboxes provide a moisture-protection solution for compatible WAGO connectors. The gel-filled enclosure surrounds the connection when the box is correctly closed.

WAGO specifies approved combinations of Gelbox and connector types. Not every WAGO 221 connector fits every Gelbox, so the manufacturer’s compatibility information must be checked.

For 230 V applications, WAGO requires suitable additional insulation, such as installing the Gelbox inside an appropriate junction enclosure. Gelboxes can be opened for maintenance, but the used Gelbox and connectors must not be reused when reworking the connection, in accordance with WAGO’s installation instructions.

For compatible arrangements, see WAGO’s official Gelbox product finder.

5. Wireless Kinetic Switches for Outdoor Lighting Control

For certain exterior lighting installations, compatible wireless kinetic switches can provide flexible control without requiring a conventional wired connection to the wall switch.

Selected kinetic switches generate the energy required to transmit a switching signal when pressed, eliminating the need for a battery in the switch itself. The compatible receiver still requires its appropriate electrical supply and installation arrangement.

Outdoor suitability depends on the particular switch’s environmental rating and manufacturer’s instructions. Do not assume that every kinetic switch can be installed directly in exposed weather.

Watch Wireless Kinetic Switches in Action

The following short video demonstrates a wireless kinetic switching arrangement. Explore our kinetic switch range for suitable products and accessories.

6. Essential Tools for Outdoor Electrical Wiring

Suitable tools help installers prepare cables, secure enclosures and make electrical connections correctly. The tools required depend on the cable construction and equipment being installed.

C.K Tools Stubby VDE Screwdriver

A compact C.K Tools stubby VDE screwdriver set can be useful when working around junction boxes in restricted spaces.

Use the correct screwdriver tip for the enclosure fixings to reduce the risk of damaging screw heads or cover mechanisms. Follow appropriate isolation and safe-working procedures before electrical work.

Additional Useful Tools

• Suitable SWA cable cutters for cleanly preparing steel wire armoured cable.
• Appropriate cable stripping and sheath-removal tools.
• Drill bits and fixings selected for the mounting surface and enclosure.
• Suitable gland spanners or manufacturer’s recommended installation tools.
• Approved electrical test equipment for the work being undertaken.

Outdoor Wiring Installation Checklist

• Check the installation environment and required enclosure protection.
• Select cable suitable for the exposure and mechanical conditions.
• Choose a junction box with enough internal space for suitable connections.
• Match glands to the cable outside diameter, construction and entry size.
• Use the correct SWA termination and earthing arrangement where required.
• Verify the compatibility and ratings of connectors and Gelboxes.
• Avoid damaging enclosure seals or creating unapproved openings.
• Follow applicable BS 7671 requirements and manufacturer instructions.

Common Outdoor Wiring Mistakes

Common problems can arise from selecting components individually without checking how they work together. Examples include:

• Assuming an IP68-rated gland makes the complete enclosure IP68.
• Using a junction box that is not suitable for the actual environmental exposure.
• Using an undersized box that provides insufficient cable-bending or connector space.
• Assuming every Storm Gland fits every SWA cable size or construction.
• Using an unapproved WAGO connector and Gelbox combination.
• Reusing Gelboxes or connectors contrary to the manufacturer’s instructions.
• Assuming wireless switching products are suitable for direct outdoor exposure without checking their ratings.

Where to Find Outdoor Electrical Installation Products

Electrical4Less supplies junction boxes, connectors and installation tools across several dedicated product ranges:

• Wiska COMBI Junction Boxes
• WAGO Shop
• C.K Tools Shop
• Milwaukee Shop
• Fischer Fixings and Accessories
• Mandrex Smart Tools

Electrical4Less – Supporting Professional Outdoor Installations

Outdoor electrical work often involves combining products from different manufacturers. Electrical4Less helps electricians and contractors source suitable enclosures, cable glands, connectors and tools from our independent electrical wholesale business in Fulham, London.

Our trade counter at 9 Seagrave Road, London SW6 1RP offers local collection, while our online store supports orders from customers throughout the UK. We are members of the Electrical Distributors’ Association (EDA) and Independent Buying Association (IBA).

Electrical4Less was a finalist for Website of the Year at the London Chamber of Commerce SME London Business Awards 2026 and was shortlisted for Best Wholesaler (1–5 Branches) at the Electrical Wholesaler Awards 2026. Our ongoing work includes improving technical product information to help customers select suitable installation materials.

Frequently Asked Questions About Outdoor Electrical Connections

Can I use a standard junction box for outdoor wiring?

Only if the enclosure is suitable for the environmental conditions and correctly installed. Check the required IP rating, cable entries, mounting arrangement and manufacturer’s instructions.

Can WAGO Gelboxes be reused?

WAGO Gelboxes can be reopened for access, but the used Gelbox and connectors must not be reused when reworking the connection, according to WAGO’s instructions.

Why use a stubby screwdriver for electrical enclosures?

A stubby screwdriver can provide improved access to fixings in restricted spaces. Always choose the correct screwdriver tip and follow appropriate electrical safety procedures.

Do Storm Glands work with every SWA cable?

No. Storm Glands are designed for specified cable types and sizes. Check cable diameter, armour construction, product compatibility and installation instructions.

Are WAGO 221 connectors waterproof?

No. WAGO 221 connectors are not independently waterproof. They require protection from a suitable electrical enclosure or a manufacturer-approved sealing arrangement.

Does an IP68 cable gland make the whole junction box IP68?

No. The protection rating of the complete installation depends on the enclosure, glands, cable entries, lid seals and correct assembly.

For more detailed enclosure advice, read our Wiska COMBI outdoor installation guide or compare products in our Wiska COMBI junction box category.