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UPS extension lead buying guide

Updated: October 2026

You have a small UPS under the desk, the outlets on the back are IEC kettle sockets, and the router still has a normal British 3-pin plug. A UPS extension lead buying guide is the short list of label facts that matter before you pay, because the wrong shape will not fit and a hopeful wattage line will not raise the current. This page is the checklist. The [UPS extension lead comparison](/hub/sockets-and-extension-leads/ups-extension-lead) holds the seven-row price table. Products Compared compared those amazon.co.uk listings on 16 October 2026. We did not lab-test the leads. A qualifying purchase through our amazon.co.uk links can earn us a commission at no extra cost to you.

You have a small UPS under the desk, the outlets on the back are IEC kettle sockets, and the router still has a normal British 3-pin plug.

Our top picks

PRO ELEC PRO ELEC 2 m C14 to 4-gang

Best overall

PRO ELEC PRO ELEC 2 m C14 to 4-gang
8.2/10about £5.19
View offer
KC CABLE KC CABLE 2 m C14 to C13

Alternative

KC CABLE KC CABLE 2 m C14 to C13
6.3/10about £8.99
View offer
UINCLU Computer Spares 1 m C14 to 4-gang

Rank 3

UINCLU Computer Spares 1 m C14 to 4-gang
8.6/10about £11.49
View offer
On this page
  1. 1.Which end has to be a C14
  2. 2.The current figure that actually limits you
  3. 3.Length, surge lines, and the prices in this set
  4. 4.What this guide will not decide

Which end has to be a C14

The end that goes into the UPS is an IEC 60320 C14 plug: three pins in a figure-of-eight-with-earth shape. It clicks into a C13 outlet on the UPS or on a PDU. It does not go into a wall socket, and a wall surge strip with a BS 1363 plug does not go into the UPS the other way. If you only need to move a kettle lead a bit further, you want a C14 male to a C13 female, which is the KC CABLE shape in the main table. If a router, switch, phone base, or plug-top supply still has a UK plug, you want a C14 into a block of BS 1363 sockets. The C14 to UK socket extension page stays on that second job.

The current figure that actually limits you

Every kept listing claims 10 A, unless the UPS manual prints something lower. On PEL01206 the bullets say 10 A and a separate input-current line says 5 A. On the KC CABLE 2 m lead, the current field says 10 A at 250 V while the wattage field says 3,750 W. The Computer Spares listing prints 10 A, 240 V, and 2,400 W, which agree. Ignore 3,750 W. If the unit in your hand shows two amp figures, use the lower one.
PRO ELEC PRO ELEC 2 m C14 to 4-gang

Testsieger

PRO ELEC PRO ELEC 2 m C14 to 4-gang
8.2/10about £5.19
View offer

Length, surge lines, and the prices in this set

PEL01204 is 1 m at £5.19. PEL01206 is 2 m at the same £5.19. PEL01205 is 1.5 m at £10.58, without a higher current claim. A rack usually wants 1 m. A router across a small office often wants 2 m. The best UPS extension lead page says who should skip the dearer 1.5 m lead. None of the seven pages prints a surge joule rating. Treat the whole set as leads without a surge specification. Schneider Electric UK FAQ FA158852 advises against surge strips and extension cords on APC Back-UPS and Smart-UPS outputs.

What this guide will not decide

This checklist will not crown a lead, promise a UPS runtime, or treat 3,750 W as available power. Before you pay, confirm the UPS end is a C14, the outputs match the plugs you own, the lowest amp figure is clear, and the cable reaches without a second extension.

Common questions

Does the lead need a UK 13 A plug on the UPS end?
No. The UPS end is a C14 plug for a C13 outlet. A BS 1363 plug is what goes into the 4-gang, from the router or the plug-top supply. A lead with a UK plug on the UPS end is a normal wall extension, and it will not fit the IEC outlet. The seven listings kept for this comparison all start with C14.
Is 10 A or 13 A the number to obey?
Obey 10 A, or the lower figure if the UPS manual or the lead itself prints one. Reviewers have seen 13 A printed on PEL01204 and on the Computer Spares block. That stamp matches the look of a UK socket face. It does not increase what a C14 inlet is rated to carry. Four sockets are not four full wall-socket loads.
When is a C13 extension the wrong purchase?
It is the wrong purchase as soon as one device has a UK 3-pin plug. The KC CABLE lead is C14 male to C13 female, with no BS 1363 sockets. It is the right purchase when you are only making a kettle lead longer, for a PC or a monitor that already has an IEC inlet. The Flomiara splitter is the same limitation twice: two C13 outputs, still no UK socket.
Why is the 1.5 m PRO ELEC dearer than the 2 m?
On amazon.co.uk in this set, PEL01205 is 1.5 m at £10.58 and PEL01206 is 2 m at £5.19. The 1 m PEL01204 is also £5.19. The middle length does not show a higher current claim, a surge rating, or a larger review sample. Pay it only when 1.5 m is the length you measured and the cheaper 2 m lead will not do.
Do any of these seven list a surge joule rating?
No. None of the captured pages gives a joule figure. One review of the 1 m PRO ELEC says the lead does not provide surge protection. If you follow Schneider's FAQ for APC Back-UPS and Smart-UPS units, you also do not add a separate surge strip on the UPS output to fill that gap.
What does unfused mean here?
It means the C14 plug does not contain a BS 1362 fuse the way a normal UK wall plug does. Kenable prints unfused on a 10 A C14-to-4-gang of this shape. The current limit is still the 10 A claim and whatever the UPS allows. It is not an invitation to load the block like four fused 13 A sockets.
Should I buy the lead with the most reviews?
Buy it when you want the largest buyer record for a 1 m UK-socket block and you accept £11.49, mixed 13 A printing, and brittle-plastic comments. That is the Computer Spares lead, 4.7 from 647 reviews. If you need 2 m and the lower price, PEL01206 at £5.19 has 4.8 from 79 reviews and a 5 A line you should read before you check out.

Related pages

How to connect a UPS extension lead

UPS extension lead

Best UPS extension lead UK: reviews, length, price

C14 to UK socket extension: four sockets, one feed

C14 to C13 or UK sockets: a kettle lead or a 4-gang

Sources

Public UK sources used for this comparison. Listing prices, stars, and review counts are the amazon.co.uk lines from 16 October 2026.

  1. Electrical Equipment (Safety) Regulations 2016, regulation 35 (retrieved 16 October 2026)
  2. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 16 October 2026)
  3. Electrical Safety First — extension leads (retrieved 16 October 2026)
  4. Electrical Safety First — overloading sockets (retrieved 16 October 2026)
  5. HSE INDG236 (retrieved 16 October 2026)
  6. Schneider Electric UK FA158852 (retrieved 16 October 2026)
  7. Bulgin IEC connector ratings (retrieved 16 October 2026)
  8. Kenable 2 m C14 to 4-gang (retrieved 16 October 2026)