Bonding and Grounding at the Riser Pole

Crews treat bonding and grounding like a quick checkbox, but it should never be handled that way. Bonding and grounding are the simple steps that keep a normal day on the job from turning into someone getting hurt. Any time you run fiber up a pole, you are stepping into the power company’s territory, and their rules apply whether your crew thinks about them or not.

A riser is not just a pipe. The moment you strap a steel riser to a pole, it becomes part of the pole system. That means it falls under the same safety rules the power company follows. Those rules say one thing very clearly: every piece of metal you add to the pole must be connected to the pole’s ground. When metal on a pole is not bonded, it can end up with a different level of electrical energy than the rest of the pole. That difference is what creates shock. A broken wire is not required for this to happen. A lightning strike on a nearby pole, a primary conductor slapping in the wind, or a neutral fault pushing current through the system can all energize the pole.

This is where a lot of crews misunderstand the job, thinking grounding only applies to copper or to power equipment. If something is made of metal, it can carry electricity, and if it can carry electricity, it must be bonded. This includes:

• steel risers

• messenger strand

• riser straps

• grounding bushings

• J-hooks

• brackets

• any other metal part you fasten to the pole

The safety codes and standards all point to the same simple idea even if the wording changes from book to book. NESC covers the bonding and grounding requirements. RUS standards explain what materials and methods are acceptable. Pole owner specifications lay out the exact steps they expect you to follow on their system. All of these say the same thing in plain terms: every metal piece on the pole must be tied into one safe path the pole’s ground wire.

One of the biggest dangers in the field is floating metal. Floating metal is any metal part that is attached to the pole but not bonded. It just sits there with no safe place for energy to go if the pole takes a hit. Bonding prevents that problem. When every metal part is bonded, the entire system stays at the same electrical level. If something happens, lightning, a line drop, a fault, the energy goes into the pole ground exactly the way it is designed to. It does not go into the crew member working the riser.

A good bond is nothing fancy. A proper bond looks clean and straightforward. The clamp is tight and the correct size for the pipe. The #6 copper wire is straight and not twisted or kinked. The wire runs directly to the pole’s ground in the exact way the power company requires.

Where Bonding Actually Starts

Bonding does not start at the top of the riser; it starts at the very first place the metal begins, the transition from the underground conduit into the steel pipe. The underground conduit comes up the pole and then you tie into the steel riser with a coupling or transition fitting. That fitting is where the metal starts, and from that point up, everything can carry electrical current.

The moment the steel riser touches the pole, it becomes part of the pole system. Steel does not have to be in the ground to pick up energy. If lightning hits nearby, the pole can rise in potential. If a primary conductor slaps the pole, current can travel through the structure. If there is a fault anywhere on the system, the pole ground has to move that current safely. If your riser is not bonded into that path, the fault can travel through the metal you installed or into the hands of the person working on it.

A proper bond is simple:

• Bond the steel riser at the transition or first strap point with an approved bonding clamp. This is the first piece of exposed metal, which is why the bond starts here.

• Run a bonding conductor, most specs call for #6 copper, directly to the pole’s ground wire. This gives any fault current a safe place to go instead of letting it build up in the riser.

• Tie into the existing ground using the pole owner’s approved method. Power companies all have their own required connectors and practices, and you follow them exactly.

• If the riser has a messenger entering it, that messenger must also be bonded.
  It is metal, so it can carry current the same way the riser can.

• If the route goes up the pole and transitions to aerial strand, that strand bond must be continuous from the riser all the way to the grounding point. Everything metal must rise and fall together electrically.

Every pole owner may use slightly different hardware or routing, but the logic is always the same. The steel riser becomes part of the pole’s electrical world the moment it is attached, and you have to give it a safe, continuous path back to the pole’s ground. If you don’t, you leave floating metal on the pole and floating metal is how people get hurt.

Floating Metal

You see it all the time in the field. Someone installs a steel rise, straps are tight, pipe is straight, seal at the bottom is clean. Everything looks right until you notice the riser is not bonded to anything. It is just hanging there as a piece of exposed metal on a power pole with no safe path to the ground.

A riser that is not bonded is called a floating riser, and it is one of the most dangerous things you can leave behind on a pole. A floating riser can pick up energy from several sources, even on a normal day. It can become energized from:

• induction from the primary, which can place voltage on metal without any direct contact

• a neutral fault, which can push current through the pole and everything attached to it

• a lightning hit, even one that strikes a pole that is not very close

• a downed conductor, which can place dangerous energy into the entire structure

• back feed from someone working upstream, especially during switching or maintenance

Any one of these events can put voltage on that steel pipe. If the pipe is bonded, the energy goes safely down the pole ground. If the pipe is not bonded, the energy sits in the metal waiting for someone to touch it. The first person who grabs that riser becomes the path to the ground, and that is when people get hurt.

Bonding removes the surprise. It takes the guesswork out of the system and gives every piece of metal a safe path to follow when something goes wrong. A bonded riser does not build up hidden energy. It simply becomes part of the pole’s grounding system.

What Good Bonding Looks Like

When a bond is installed the right way, there is nothing creative, nothing messy, and nothing that grabs your attention. It simply looks the way the standard shows it, and it does its job. A proper bond is simple because it follows the same pattern every time.

You can spot a correct bond by looking for a few basic things:

• The clamp is tight, sized correctly, and rated for the pipe. A clamp that actually fits and holds is the foundation of the entire bond.

• The #6 copper is clean. The wire should run straight and look intentional, not like someone rushed through it.

• The run is short and direct, with no creative routing. Longer wires introduce more resistance.

• The connection to the pole ground is solid and approved. Pole owners have strict rules on how to tie into their grounding system, and a correct bond always follows those rules.

• The messenger, if present, is bonded into the same system. Any metal that can carry energy must be tied into one continuous grounding path.

What Happens When You Skip It

Bonding and grounding don’t matter until the exact second they matter more than anything else. When a pole takes a hit, the whole system reacts whether you’re ready or not.

When a fault runs through a pole, this is what happens every single time:

• Everything metal tries to become the path. It doesn’t care what it is or who put it there, metal is metal.

• The system looks for the lowest resistance. Electricity will always take the easiest way down, even if that “easy way” is a riser.

• If your riser isn’t tied in, it becomes the new path. A floating riser becomes the shortcut, and that’s when it turns dangerous.

This is when jackets bubble, steel snaps or arcs, and the guy with his hand on the pipe gets the hit instead of the ground wire. It doesn’t happen during blue-sky days. It happens in storms, in faults, in line slaps, and in moments when no one is thinking about the riser at all.

Simple Guideline

If it’s metal and it’s on the pole, it gets bonded.
If it leaves the ground and runs vertical, it gets grounded.
If it touches the messenger or strand, it becomes part of the system.

That’s the standard. That’s the way every pole owner wants it.