How do you connect multiple outdoor pendant lights together?

Multiple outdoor pendant lights are wired in parallel on a single radial circuit, meaning the live, neutral and earth conductors run from the consumer unit to the first fitting, then loop onwards to each subsequent pendant. Parallel wiring matters because each fitting receives the full 230V supply; if you wired them in series, one failed lamp would break the entire string. The circuit should be protected by an RCD at the consumer unit, which is standard on modern outdoor circuits under BS 7671. Connection points are made either in an IP-rated junction box or at the loop-in terminals of the first ceiling rose, depending on how the supply is routed. When specifying a run of fittings, choose outdoor pendant lights with a matching IP rating and consistent lamp holders so the circuit stays uniform. For a typical run of three to five pendants along a pergola or veranda, a 6A or 16A radial on a 1.5mm² cable is the usual specification, with the cable size confirmed against the circuit breaker rating and installation method.

Outdoor pendant connections need an IP44 rating as the minimum for covered locations such as a porch or veranda, and IP65 where rain can reach the fitting directly. Every joint in the circuit must sit inside an enclosure with the same or higher IP rating as the fittings themselves — a standard indoor junction box will admit moisture and corrode the terminals within a season. Use 1.5mm² three-core cable as the default for a pendant circuit; steel-wire-armoured (SWA) cable where the run is exposed or clipped along a surface, and rubber-sheathed H07RN-F flex for the final drop into each pendant. Terminate SWA with proper glands so the armour provides earth continuity. Before any work starts, isolate the circuit at the consumer unit and confirm dead with a two-pole tester — guidance on working safely around household electrics is published by Electrical Safety First and applies to outdoor circuits just as much as indoor ones. Cable entries into fittings should face downwards and be sealed with grommets or glands to stop water tracking inside.

To link several pendants, run the switched supply to the first fitting's junction box, then continue the same three cores onwards to the second, third and subsequent positions, looping in and out at each point. Keep the cable runs equal in length where the pendants hang in a row, because unequal drops make the fittings sit at different heights and put uneven weight on the terminations. Each junction box should be accessible for maintenance — either mounted on the rear of a beam, inside a soffit, or in a purpose-made weatherproof enclosure — never buried in render or sealed behind cladding. Where the pendants hang from a structure that moves, such as a timber pergola, leave a small service loop of flex at each drop so vibration doesn't stress the terminals. If the run includes recessed fittings alongside the pendants, the same looping principle applies, and the downlight-specific wiring and fire considerations covered by Electrical Safety First's downlight guidance are worth following for the connection detail. Label the circuit at the consumer unit so future work starts with the correct isolation.

You need a registered electrician for any new circuit or new fixed wiring outdoors, because that work is notifiable under Part P of the Building Regulations in England and Wales. Replacing an existing outdoor pendant with a like-for-like fitting on the same connection points is generally non-notifiable, provided the connections stay inside the existing weatherproof enclosures and you isolate and test correctly. A registered electrician will issue the appropriate certification, verify earth fault loop impedance and RCD operation, and confirm the cable size matches the breaker — checks that matter more outdoors, where moisture and temperature swings expose weak terminations faster than indoors. If you are extending a circuit from an existing outdoor socket or supply, that extension is also notifiable, so budget for professional work in the plan. The practical division is straightforward: an electrician runs the radial circuit and makes the permanent joints, and you handle the straightforward swap of fittings such as hanging a replacement pendant from an existing weatherproof hook and connector. That keeps the notifiable work certified and the routine maintenance within your own control.