{"id":613,"date":"2026-10-21T21:07:31","date_gmt":"2026-10-21T13:07:31","guid":{"rendered":"http:\/\/www.templeracing.com\/blog\/?p=613"},"modified":"2026-10-21T21:07:31","modified_gmt":"2026-10-21T13:07:31","slug":"what-is-the-breaking-load-of-an-installation-cable-4438-390cbf","status":"publish","type":"post","link":"http:\/\/www.templeracing.com\/blog\/2026\/10\/21\/what-is-the-breaking-load-of-an-installation-cable-4438-390cbf\/","title":{"rendered":"What is the breaking load of an installation cable?"},"content":{"rendered":"

Hey everyone, and welcome back to the blog\u2014today we\u2019re diving into a question we get all the time here at the shop (and yeah, I\u2019ve lost count of how many times our guys on the support line repeat this): \u201cWhat\u2019s the breaking load of an installation cable, anyway?\u201d Installation Cable<\/a><\/p>\n

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If you\u2019re new to working with cables\u2014whether you\u2019re an electrician on a residential job, a contractor running power for a retail fit-out, or even someone just trying to wrap your head behind the specs on that spool you bought last month\u2014this term might sound like just another tech-jargon line on a data sheet. But trust me, it\u2019s way more important than it sounds. Skimping on paying attention to breaking load? That\u2019s how cables snap mid-install, how jobs get delayed, and (worse) how people end up dealing with dangerous, avoidable messes.<\/p>\n

Let\u2019s start with the basics: what actually<\/em> is breaking load? For anyone who\u2019s ever torn a plastic bag a little too hard, or stretched a rubber band until it pinged across the room, this is exactly the same concept\u2014just for heavy-duty cables that hold up power, data, or control signals in buildings, warehouses, and even outdoor setups. Breaking load (sometimes called \u201ctensile breaking strength\u201d if you\u2019re reading the fine print) is the maximum amount of pulling force a cable can handle before it splits, frays, or breaks entirely. And no, it\u2019s not a random number\u2014every installation cable is engineered with this specific spec tailored to what it\u2019s going to do.<\/p>\n

Wait, hold on\u2014before you go \u201ccool, so it\u2019s just how hard you can pull it?\u201d here\u2019s the catch: not all cables are built the same. A 14\/2 Romex for a bedroom wall? Its breaking load is way lower than a 4\/0 power cable you\u2019re pulling through 100 feet of conduit in an industrial basement. That\u2019s because each installation scenario has different pull forces. Let\u2019s break down why that matters. When you\u2019re running a cable, you\u2019re not just tugging on the end gently\u2014you\u2019re pulling it through conduits, around corners, over bends, sometimes even around structural beams. All that adds up to pulling force on the cable\u2019s core. If your cable\u2019s breaking load is too low for that job? You\u2019ll hit a point where the insulation tears, the copper conductor snaps, or the armor (for armored cables) cracks.<\/p>\n

Here\u2019s a real example from a job we did last quarter: a small electrical contractor came to us panicking because they\u2019d bought some cheap 10mm\u00b2 installation cable from a no-name supplier. They were pulling it through a 90-degree bend in a 2-inch conduit, and halfway through, the cable snapped\u2014right when they were 70% done with the install. Turns out, that cheap cable had a breaking load of only around 1,200 Newtons (N), but the actual pull force they needed was closer to 2,100 N. We swapped them over to our standard industrial-grade installation cable, which hits 2,500 N breaking load, and they finished the job in an hour instead of losing a whole day running back to supply stores and fixing the mess. That\u2019s the difference between knowing your breaking load and guessing.<\/p>\n

Now, how is breaking load calculated? It\u2019s not just a guess from the factory\u2014there are standardized tests for this. Most installation cables follow IEC standards (IEC 60227 for fixed power cables, IEC 60332 for flame tests, but breaking load is usually covered in IEC 60942 for flexible cables, if I\u2019m not mixing up my specs). The test is pretty straightforward: you clamp one end of the cable tight, hook the other end to a tensile tester, and slowly pull until the cable breaks. The number on the tester right when it snaps is the breaking load. But here\u2019s the thing: that number is also adjusted for the cable\u2019s construction. If you have a cable with a steel armor layer (like our AC90 armored installation cable), that armor adds a ton to the breaking load\u2014so it\u2019s not just the copper or aluminum conductor holding up. For unarmored cables, the breaking load comes from the conductor (copper or aluminum), the insulation, and any reinforcing materials woven into the jacket.<\/p>\n

Wait, but let\u2019s talk about a related term people mix up all the time: working load vs breaking load. Super important to not confuse these! Working load (or safe working load, SWL) is the amount of force you should<\/em> apply to the cable during installation. That\u2019s never the full breaking load. For most of our installation cables, the safe working load is about 50-60% of the breaking load. So if a cable has a 2,500 N breaking load, you never want to pull it harder than 1,250-1,500 N. Why? Because even if you can<\/em> pull it to 2,500 N without breaking it, pulling that close weakens the cable over time\u2014you might not see a break during install, but months later, that stress will cause a fault. For outdoor installation cables, that margin is even wider (sometimes 40% of breaking load) because they have to handle wind, snow, or even accidental tugs from equipment later.<\/p>\n

Now, let\u2019s get into what factors affect a cable\u2019s breaking load, because it\u2019s not just one spec. First, conductor material: copper has a higher tensile strength than aluminum, so a copper cable of the same size will have a higher breaking load than an aluminum one. That\u2019s why copper is often the go-to for long pulls\u2014you don\u2019t have to worry about it snapping mid-job. Then, conductor size: thicker conductors (like 4\/0, which is 107mm\u00b2) have more copper, so way higher breaking load than a 14AWG (2.08mm\u00b2) wire. That makes sense, right? More metal = stronger.<\/p>\n

Next, cable construction. Armored cables (with steel or aluminum armor sheathing) have a massive boost in breaking load\u2014some of our armored installation cables hit 10,000 N breaking load, perfect for pulls through tight conduits or outdoor runs where you might have to drag the cable a little over rough ground. Even unarmored cables have reinforcing: for example, our LS0H (low smoke zero halogen) installation cables have a polyester core woven in around the conductor, which adds extra tensile strength without making the cable stiff. Jacket material also plays a role: a PVC jacket is tough, but a cross-linked polyethylene (XLPE) jacket is even stronger, so XLPE-jacketed cables will have a higher breaking load than PVC of the same size.<\/p>\n

Then there\u2019s the installation method. Wait, that\u2019s a factor? Yeah! If you\u2019re pulling a cable straight through a smooth conduit, your pull force is lower. But if you\u2019re pulling around multiple 90-degree bends, that friction adds up. If you\u2019re running cable over a beam or a ledge, that creates a sharp point that can pinch the cable, reducing its effective breaking load by 20-30% right there. We always tell customers: when calculating your required breaking load, add a 15-20% safety margin for those curve and friction factors. Because even if your cable\u2019s spec is 2,500 N, if you\u2019ve got three bends, that\u2019s 2,125 N total\u2014so you need a cable with at least 2,200 N breaking load, minimum.<\/p>\n

Let\u2019s talk about common mistakes we see people make with breaking load. The biggest one is ignoring the spec on cheap cables. We\u2019ve had customers come in with cables that say \u201c10mm\u00b2 power cable\u201d on the spool, but when we look at the data sheet, their breaking load is 800 N\u2014way too low for a long pull. Another mistake is mixing up cable types: using a data cable\u2019s breaking load for a power cable? Data cables have way lower tensile strength, so they\u2019ll snap if you pull them hard for power runs. And don\u2019t forget outdoor vs indoor: indoor installation cables are often thinner, with less reinforcement, so their breaking load is lower. If you run an indoor cable outside, where you might have to drag it over dirt or through overhead branches, you\u2019re way more likely to break it.<\/p>\n

Wait, what about termination? That\u2019s another hidden factor. Even if your cable has a high breaking load, if you crimp a terminal wrong, the terminal will pull out of the cable before the cable itself breaks. So when you\u2019re installing, make sure your crimps are done properly\u2014use a hydraulic crimper for heavy cables, not pliers, because pliers don\u2019t create a tight enough connection. That way, you\u2019re actually using the cable\u2019s full breaking load, not wasting it on a bad termination.<\/p>\n

Now, let\u2019s tie this back to why this matters for you<\/em>, if you\u2019re working with installation cables. If you\u2019re a contractor, getting the right breaking load means no more wasted time re-running cables, no more extra costs for replacement materials, and most importantly, no safety hazards. If you\u2019re a DIYer doing a home reno? Skip the cheap big-box store cables\u2014they often cut corners on breaking load to save money. That $20 spool might look like a deal, but if it snaps while you\u2019re running power to your new workshop, you\u2019re looking at $100+ in extra work and a huge headache.<\/p>\n

At our company, we test every spool of installation cable that leaves our warehouse for breaking load. We don\u2019t just rely on factory specs\u2014we do random tensile tests every week to make sure what\u2019s on the data sheet matches what\u2019s in the box. That\u2019s why our customers come back: they know when they pull our cable, it\u2019s going to hold up. We even give each customer a free pull force calculator sheet when they order, so they can figure out exactly what breaking load they need for their specific job.<\/p>\n

So, to wrap this up: breaking load is the max pulling force an installation cable can take before breaking. It\u2019s not just a tech spec\u2014it\u2019s the difference between a job that goes smooth and one that derails. Always remember to use safe working load (not full breaking load), add a 15-20% margin for installation friction, and pick a cable whose breaking load matches your project\u2019s needs.<\/p>\n

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If you\u2019re planning an installation, whether it\u2019s a small residential job or a big industrial build, and you\u2019re not sure what breaking load you need for your cable, hit us up. We\u2019re here to help you pick the right cable, no jargon, no pressure. Just shoot us a message and we can walk through your project step by step.<\/p>\n

High Voltage Power Cable<\/a> References:
\nIEC 60227: Polyvinyl chloride insulated cables of rated voltages up to and including 450\/750 V
\nIEC 60942: Flexible cables for installation purposes – Requirements and test methods
\nNational Electrical Code (NEC) Article 334: Fixed branch circuit wiring (non-metallic sheathed cable)<\/p>\n

\n

Jiangsu Changcheng Cable Co., Ltd.<\/a>
Jiangsu Changcheng Cable Co., Ltd. is one of the most professional installation cable manufacturers and suppliers in China for over 25 years, providing the best customized service with low price. Please feel free to wholesale cheap installation cable from our factory.
Address: Room 2101, Yunhe Building, No.318, West Wenchang Road, Yangzhou City, Jiangsu Province, China
E-mail: info@cncablefactory.com
WebSite: https:\/\/www.cncablefactory.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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