Wiring a Smallholding for Stock, Poultry and a Dog

Strands are an animal decision before they are a wire decision

The strand count is the multiplier on the whole order, and it comes from what is being held rather than from what is being spent. Cattle in a settled routine can be held by one or two electrified wires because they respect a fence they have been taught once and are too big to go under it. Sheep are a different proposition entirely: they go under, they go through, and a fleece is an insulator, so an electrified line that stops a bullock is barely noticed by a ewe in full wool. Goats treat every fence as a climbing frame. Pigs work at ground level with a nose designed for lifting, so the strand that matters most to them is the lowest one, set far lower than instinct suggests. Horses need visibility above all — a taut plain wire at chest height is close to invisible to a galloping horse, which is why tape and rope exist as products.

In practice a smallholding rarely runs plain strands the whole way round. The usual answer for a mixed boundary is woven stock netting for the bottom eight hundred or nine hundred millimetres with one or two plain or electrified wires above it, and the takeoff has to handle that honestly: the netting is one line item bought by the metre, and the wires above it are a strand count on the same perimeter. Run the calculator once for the strands and price the netting separately per metre of line, rather than trying to fold a sheet product into a strand count.

Both markets have a designation system for the netting, and both are worth being able to read at the counter. In Britain and Ireland a roll marked C8/80/15 carries eight horizontal line wires, stands eight hundred millimetres tall, and has its vertical stays at a hundred and fifty millimetre centres, with the leading letter giving the wire grade. In North America the equivalent number is written 1047-6-12½: ten line wires, forty-seven inches tall, six-inch stays, twelve-and-a-half gauge. Closer stays cost more and are what you buy for sheep and goats; wider stays are for cattle, where the animal is too big to exploit the gap. Graduated spacing — tight at the bottom, opening out toward the top — is the pattern to look for on anything mixed.

What the strand calculator does is the multiplication and the rounding, and it is worth knowing exactly what it rounds to. It takes the fence line, multiplies by the strand count, adds five per cent, and divides by 1,320 feet, which is the quarter-mile roll that dominates North American agricultural wire. That five per cent is not a fudge factor for bad measuring; it is the wire that disappears into the job — the wrap at every strainer, the tie-off at every corner, the tail left at a joining knot, the length pulled through and cut off when a run is re-tensioned. Corners eat it fastest, so a paddock with six changes of direction burns more of it than a rectangle does.

If you are buying in metric rolls, take the total length from the breakdown rather than the headline roll count, which is quarter-mile rolls whichever way the page is set. Set the page to metric and that breakdown line restates itself in metres, so it is already the number to divide — no second conversion, and a length converted twice is how an order comes in at a third of what the fence needs. Divide it by whatever your supplier stocks — stock netting is normally fifty or a hundred metres to the roll, and plain high-tensile wire is often sold by coil weight instead of length, which needs one more step. A 2.5 mm steel wire has a cross-section of about 4.9 square millimetres, and at roughly 7,850 kilograms per cubic metre that works out near 38.5 grams a metre, so a twenty-five kilogram coil holds a shade over six hundred and forty metres before you allow anything for the zinc. Do that division once and write it on the inside of the barn door; you will need it every time.

A run wall is only as good as its bottom edge

The poultry run is where the wire changes character completely. A paddock fence is a line, and a run is a box — five faces of it, if the roof counts, and it should. Chicken wire is the wrong material for all of them and is worth being blunt about: hexagonal netting keeps birds in and stops nothing determined from getting through it. A fox will tear it and a raccoon or a mink will open the hexagon with its hands. Hardware cloth is a welded fabric with a small square aperture, and half-inch mesh rather than one-inch is what excludes the small predators that do the most damage — weasels, stoats, rats and snakes all pass a one-inch square without slowing down. There is an ASTM specification for the material, A740, covering hardware cloth as woven or welded galvanized steel wire fabric, but very little of what a general hardware store sells is offered against it, so treat the aperture and the wire diameter printed on the label as the thing you are actually buying.

The bottom edge is where runs are lost, and it is a positional detail rather than a quantity one. Cloth taken straight down into a trench asks a digging animal to give up at a depth it cannot see, which foxes and dogs routinely do not. The same cloth turned outward at ninety degrees and laid flat just under the turf, staked down and left to grow through, meets the animal at the point it starts digging, which is hard against the fence line. It is the same material, the same money and a different result, and the drawing below exists because it is far quicker to see the L than to read it.

Then there is the roll-height trap, which is the single most common way this order comes up short. Hardware cloth is commonly stocked in twenty-four, thirty-six and forty-eight inch widths — six hundred, nine hundred and twelve hundred millimetres — and a predator-proof run wants a wall of about six feet with a foot of apron on the bottom of it. That is very nearly seven feet of fabric height, and no roll on the rack is seven feet wide. So the wall is two courses of forty-eight inch cloth, lapped and laced together at the joint, and the linear quantity is doubled. The calculator returns the linear length of one course; divide the required roll height in the breakdown by the width you can actually buy, round up, and multiply.

Two more quantities live outside that number and want writing on the docket separately. The roof is an area rather than a perimeter, and if it is being covered against hawks and owls it is bought by the square metre or square foot of plan area — worth remembering that in the United States raptors are protected under the Migratory Bird Treaty Act and in Great Britain under the Wildlife and Countryside Act 1981, so exclusion is the only legal answer available. And the fixings are their own line: hardware cloth is only as good as its edge, and an edge held by a handful of staples is a hinge waiting to be lifted. Batten it, screw the batten, and lace every roll-to-roll joint closed with wire rather than trusting an overlap.

The dog's boundary is two lengths of wire and one legal fiction

An in-ground containment system is not a fence and should not be bought as one. It is a loop of wire radiating a signal, a transmitter, a collar and — this is the part that gets skipped — a fortnight of training with flags in the ground, without which the collar is a punishment the dog cannot connect to anything. It stops a trained dog leaving. It stops nothing arriving: not a loose dog, not a fox, not a child who wants to stroke the collie. And it does not discharge the keeper's liability, which sits under the Dangerous Dogs Act 1991 in Great Britain and under state and municipal leash and at-large ordinances in the United States, none of which recognise an invisible boundary as containment. Where the dog is the reason for the fence and not merely a user of it, the honest answer is a physical fence, with the loop as a supplement across a driveway or an opening you cannot gate.

The wire quantity has two parts that behave differently. The boundary loop itself must be one continuous, unbroken run that returns to the transmitter, and it cannot cross itself without cancelling the signal along the crossing. The lead-in from the transmitter — usually in a garage or an outbuilding — out to where the loop begins is twisted pair, which carries no field and can be routed anywhere, and it counts twice, because it goes out and comes back. On a house where the garage sits sixty metres from the field boundary, that tail alone is a hundred and twenty metres before a single metre of loop is laid, which is why the calculator asks for it separately and doubles it for you.

Exclusion zones are counted the same way and are where the estimate usually goes wrong. Keeping the dog out of a vegetable bed, a pond or the front garden means running twisted pair from the main loop to the excluded area, a loop around the exclusion, and twisted pair back — so every exclusion costs its own perimeter plus twice its distance from the boundary. Add those to the loop length before you run the numbers, not after. The ten per cent the calculator adds on top is burial slack and splices: wire never follows the line you measured, it goes round the base of a tree, dips into a trench and comes back out, and every joint has to be a waterproof gel-cap connector because a splice in wet ground is how a loop fails six months later with no visible cause.

Two practical constraints come off the manufacturer's manual rather than off any standard, and they are not interchangeable between brands. The first is maximum loop length for the supplied wire gauge — the thin twenty-gauge wire in a retail kit has real resistance over a long agricultural boundary, and a heavier gauge is a specified upgrade with its own maximum, not a general improvement. The second is burial depth, which is shallow by design: an inch to three inches, a few tens of millimetres, deep enough to be clear of a mower and no deeper. Across a drive, a saw kerf filled with sealant is the standard detail. Before any of that, trace the route: HSE guidance HSG47, Avoiding danger from underground services, is the reference in Britain and a one-call service is the equivalent elsewhere, and a domestic boundary is exactly where an unrecorded water pipe or a garden lighting run is waiting. The transmitter is a low-power radiator and carries FCC Part 15 compliance in the United States, but nothing in that governs the layout: what makes the manual so particular about loop shape is the cancellation described above, which is also why two legs of the boundary forced to run close together have to be twisted rather than simply laid side by side.