Fish Tape

A fish tape is a stiff but flexible ribbon wound in a reel, used to route pull lines and cable through conduit, walls and other enclosed paths. Fed through the run and attached to the conductors, it pulls wire back along the same path. The catalog lists 20 models from Klein Tools and KNIPEX.

Models

Varies by model

Tape material

Brands

How it works

The tape pays out from its reel and is pushed through the raceway or cavity, its stiffness letting it track through bends without buckling. At the far end, wire or a pull rope is secured to the tape tip, and winding the reel draws everything back through the run. Material sets the behavior: steel tapes push hardest and last longest, while fiberglass and nylon tapes stay non-conductive for work around energized equipment and resist taking a set.

Types & variants

Steel fish tapes: The stiffest and most durable option, preferred for long conduit runs — but conductive.
Fiberglass fish tapes: Non-conductive tapes for work near potentially energized parts, with good pushability.
Nylon and polymer tapes: Flexible non-conductive tapes that snake through crowded cavities and tight bends.

Key specifications

Specification	Typical range	What it means
Tape material	Varies by model	Steel for stiffness and durability; fiberglass or nylon where non-conductivity matters.
Case or reel style	Varies by model	Reel design controls payout speed, rewind effort and how well the tape stores without kinks.
Tip type	Varies by model	Eyelets, hooks and swivel leaders determine how securely wire attaches and how the tip steers past obstructions.

How the industry sizes it

Fish tapes are sized by length and cross-section. Longer, wider tapes push farther through conduit before buckling, while narrow flexible tapes negotiate crowded stud bays and short bends. Electricians commonly carry a long steel tape for raceway work and a non-conductive tape for troubleshooting around equipment that could be energized.

Applications

Routing pull lines through conduit before wire pulls
Fishing cable through finished walls and ceilings
Retrofit wiring in occupied buildings
Placing pull rope in underground duct
Low-voltage and datacom cable routing

Safety & operation

A steel tape entering an energized panel is a conductor — non-conductive tapes are specified around anything that could be live, and circuits are verified de-energized first.
A long tape under push force stores spring energy; tips can whip out of a run suddenly, making eye protection standard.
Ends are inspected and dressed — a burred steel tip slices hands and snags insulation inside walls.

Standards & certifications

NFPA · NFPA 70E: Electrical safe work practices, including the use of non-conductive tools near energized parts.
OSHA · 29 CFR 1910.333: Selection and use of work practices around energized and de-energized circuits.

Frequently asked

When does a non-conductive fish tape matter?

Any time the path passes near parts that could be energized — panels, occupied raceways, troubleshooting work — a fiberglass or nylon tape removes the shock path a steel tape creates.

How does a fish tape differ from a pulling rope?

The tape's stiffness lets it be pushed through an empty run first; the rope or conductors are then attached and pulled back through by rewinding the tape.

Why do tapes kink, and does it matter?

Forcing a buckled tape around a tight bend creases it; a kinked section catches on fittings and eventually snaps, so kinked tape is cut back or retired.