WAGO Connectors Explained: How to Use 221 Series Lever Connectors on the Job

If you still reach for a chocolate block when you need to join two conductors, it is time to switch. WAGO connectors have become the go-to junction solution for UK electricians — fast to fit, reusable, fully compliant with BS 7671, and clear enough to inspect at a glance. This guide covers the main WAGO connector types, how to use them correctly, and which situations call for which product.

What Are WAGO Connectors?

WAGO connectors are push-in or lever-operated splicing connectors manufactured by WAGO Kontakttechnik GmbH. They replaced the twist-on wire nut and the traditional screw terminal block in professional electrical installation work because they are quicker to fit, easier to reopen, and do not rely on the installer applying a specific torque. The transparent housing lets you see whether the conductor has seated properly without pulling the connector apart.

All WAGO connectors sold for UK mains wiring are rated for use in fixed wiring up to 450 V and carry CE and UKCA marks. They comply with IEC 60998-2-2 and are accepted under BS 7671 (18th Edition, Amendment 2) when used within their rated current and cross-section limits.

The 221 Series: The One Every Electrician Carries

The 221 Series is the product that put WAGO on every electrician's van shelf. It uses a small orange lever that you open to insert the conductor and close to lock it in. The design works with solid, stranded, and fine-stranded conductors from 0.14 mm² up to 4 mm², and in the larger 221-415 variant up to 6 mm². That covers virtually everything from a lighting circuit at 1.5 mm² to a ring final at 2.5 mm² to a radial at 4 mm² or 6 mm².

The lever action is the key difference from older push-in connectors. Because the lever opens the internal clamp rather than relying on spring pressure alone, it takes very little effort to open, which makes the connector genuinely reusable — you can move, test, and re-terminate a conductor multiple times without damaging the wire or the connector body. On a long first-fix where circuits get tested before final connections are made, that matters.

WAGO 2-Way 221 Series Compact Lever Connectors (221-412) — Box of 100 are available at APM Electricals in Acton, W3. These handle 0.14–4 mm² conductors and are the standard size for twin-and-earth joints, extension connections, and luminaire terminations in most domestic and commercial first-fix work.

Pushwire Connectors: When Speed Matters More Than Reuse

WAGO pushwire connectors — the 2773 and 773 series — use spring-cage technology without a lever. You strip the conductor to the correct length (typically 10–11 mm), and push it straight in until it stops. The spring cage grips it immediately. These are faster to fit than the lever connectors and slightly smaller, but they are not as easy to release without a release tool. For permanent connections where you know the circuit is finished and tested, pushwire connectors are the quicker choice.

The WAGO 3-Way Pushwire Connector 2773-403 — Box of 100 is a workhorse connector for junction boxes — three-way splits on a spur, lighting loop-in points, and smoke alarm ring connections. Rated to 32 A at 450 V for conductors from 0.5–4 mm².

How to Use WAGO 221 Lever Connectors: Step by Step

Getting a reliable connection with a WAGO 221 connector is straightforward. Here is the correct procedure:

1. Strip the conductor. Strip back insulation to the length marked on the connector body — usually 11 mm for the 221 Series. Under-stripping leaves insulation inside the clamp; over-stripping exposes bare conductor outside the housing.
2. Open the lever. Pull the orange lever fully up until it stops. Do not force it.
3. Insert the conductor. Push the stripped conductor straight in, ensuring the tip reaches the back of the entry port. Stranded conductors may need a slight twist to keep the strands together before insertion.
4. Close the lever. Push the lever back down to lock the clamp. You should feel a definite click and the lever should lie flat.
5. Visual check. Look through the transparent housing. The stripped conductor end should be visible inside the chamber with no gap. If the conductor is not visible, open the lever and re-insert.
6. Tug test. Apply a firm tug to the conductor. A correctly seated 221 connector should not release under normal pull force.

If a conductor keeps falling out or the lever will not close, check the strip length and conductor size. Fine-stranded conductors below 1.5 mm² may need a ferrule (bootlace) crimped on before insertion, particularly in higher-vibration installations.

Multi-Way Connectors: Earthing Blocks and Multi-Core Splits

One of the most useful products in the WAGO range is the WAGO 5-Way Compact Splicing Connector. Five conductors into a single compact body — ideal for earth block duties in a deep back box, multi-way lighting splits, or combining neutrals from several circuits at a distribution point. These fit in places where a traditional DIN-rail terminal block would never go.

The 5-way variant is also the product to reach for when you are extending a ring final that has been teed at a spur point: split the phase, neutral, and earth through separate 5-way connectors and you have a clean, inspectable joint that any inspector can verify without your being present.

Lighting Connectors: The 224 Series

The WAGO 224 Series Lighting Connector 224-112 — Box of 50 is designed specifically for luminaire connections. It has one fixed entry for the flex side and one lever entry for the incoming circuit conductor, rated for the repeated connect/disconnect cycles that happen during lamp replacement and fitting changes. Use these inside lighting rose canopies and ceiling pendants where a standard junction connector would be a tight fit.

Wire Size Reference: Which WAGO Connector for Which Cable?

Are WAGO Connectors Compliant with UK Building Regulations?

Yes. WAGO connectors comply with BS 7671:2018 (18th Edition including Amendment 2, 2022). They satisfy the requirements for mechanical and electrical continuity under Regulation 526 when the conductor is seated fully, the strip length is correct, and the connector is rated for the conductor cross-section. If you are burying the joint in plaster or a ceiling void, use a maintenance-free connector rated for that application, or ensure the joint is accessible via a knockout junction box — the same rule that applies to any connector type.

If you encounter existing WAGO connectors on an EICR, assess them on installed condition — visible seating, correct size, accessible location — not on brand alone. A WAGO connector that is correctly seated and accessible is not a defect.

Get WAGO Connectors at APM Electricals, Acton W3

APM Electricals stocks a full range of WAGO connectors at our trade counter at 24 Western Avenue, Acton, London W3 7TZ. Call us on 020 8702 8080 to check availability before you travel, or order online at apmi.uk/collections/cable-connectors. We sell in trade box quantities — 40, 50, 80, 100, or 120 pieces depending on type — so whether you are pricing a single first-fix or stocking the van for a full rewire, pick the box size that suits. No minimum order, no trade account required to buy over the counter. Same-day collection from Acton available when you order before noon.