Do I Need In Wall Speaker Wire? The Code Answer

Quick answer / TL;DR: You need in wall speaker wire when the run goes behind the drywall, into the wall cavity, the ceiling or the floor the building's structure encloses – the concealed path the code reads the jacket for, and the CMR listing is the wire that path allows. You do not need it when the run stays on the surface: the clips along the baseboard, the desk's lead, the floor under the rug, the short connection at the rack. The answer is the run's path, and the retrofit that fishes a concealed run changes the answer to yes.

The question is the install's first decision, and the answer is the run's path rather than the wire's quality. The in wall wire is needed where the run goes behind the drywall – the concealed path the code reads the jacket for – and it is not needed where the run stays on the surface, the desk, the floor, the open path the general-purpose stock serves. The yes and the no are both right, and the figure that decides between them is the wall the wire goes into rather than the price of the roll.

This is the decision view: the paths the rating applies to, the ones it does not, the retrofit that changes the answer, and the check the install makes before the wire is bought.

The Figure That Decides It

The decision's figure is the run's path, and the path is the one the wire goes into rather than the one the install prefers. The concealed path is the run the building's structure encloses – the wall's cavity, the ceiling's joist space, the floor's bay the drywall and the subfloor cover – and the code's rules for that path are the ones the jacket's listing answers. The open path is the run the surface holds – the visible lead the clips, the desk's edge, the floor the rug covers – and the general-purpose stock is the wire that path serves. The question of whether the in wall wire is needed is the question of which path the run takes, and the answer is the one the path's figure states.

The table is the decision laid out by the path, and the reading is the wire each path takes. The concealed paths – the wall, the ceiling, the floor the structure encloses – take the CMR-rated stock, and the open paths – the surface, the desk, the short leads – take the general-purpose wire. The answer to whether the in wall wire is needed is the row the run's path sits on, and the install that reads the path first is the one that buys the wire the run actually serves.

The Concealed Path, and the Code's Interest

The code's interest in the concealed path is the fire's behavior in the space the wire occupies, and the figure is the jacket the run carries through it. The wall's cavity, the ceiling's joist space and the floor's bay are the enclosed volumes the structure's fire protection is built around, and the wire that runs through them is the one the listed stock qualifies – the CMR rating the jacket carries for the enclosed path. The unlisted stock in the same space is the wire the code's rules do not allow, and the inspection, the insurance and the resale read the same figure at the wall. The in wall wire is needed where the code's interest applies, and the interest is the path the structure encloses rather than the wire's price or the install's preference.

The inspection, the insurance and the resale

The code's figure is read by three parties, and the install's future is the one all three touch. The inspection reads the jacket at the rough-in, the stage before the drywall the wire's print is visible at. The insurance reads the concealed run the claim's investigation opens the wall for, the wire's listing the figure the coverage's terms assume. The resale reads the disclosure and the buyer's inspection, the concealed stock the figure the transaction carries. The in wall wire is needed for the code's reading, and the three parties are the ones the reading's figure reaches past the install's own day.

The Open Path, and Where the Need Ends

The open path is the need's end, and the figure is the surface the run stays on. The lead the clips hold along the baseboard, the wire the desk's edge dresses, the run the rug covers on the floor, the short connection between the components at the rack – the visible paths the general-purpose stock serves, the wire the code's concealed figure does not reach. The install that buys the in wall stock for these paths pays for a listing the path does not use, and the install that buys the general-purpose stock for them is the one the same copper serves at the same signal. The need ends at the surface, and the run that never leaves it is the one the question answers with the no.

The retrofit, and the answer that changes

The retrofit is the case the answer turns on, and the figure is the run the install chooses to conceal. The pair on the surface the owner wants behind the wall, the ceiling's surround positions the drywall will cover, the floor's run the finish will hide – the paths the retrofit takes into the structure, and the wire the listed stock has to be before the fish starts. The general-purpose stock on the pre-wired run is the retrofit's other case: the wire the builder left in the wall, the jacket's absent print, and the question the answer reads at the wall's opening. The answer changes when the path changes, and the retrofit is the install the answer changes for.

In wall speaker wire is the CMR-rated line for the concealed paths and the general-purpose speaker wire the surface stock for the open ones; the catalog lists the gauge, the jacket rating and the length per roll, and the run's path is the figure the need is read against.

Real-World Applications

The new build's rough-in: the listed stock through the wall's cavity before the drywall, the jacket's print the inspection reads, and the answer the path states before the wire is bought. The apartment's surface pair: the general-purpose stock along the baseboard's clips, the open path the code's figure does not reach, and the buy the surface saves. The retrofit that fished the pair into the cavity: the answer changed at the fish, the listed stock the run the wall now holds, and the figure the code reads at the opening the install cut. In each the question of whether the in wall wire is needed is the run's path – the concealed the listed stock serves, the open the general-purpose stock dresses – and the answer is the one the wall the wire goes into states.

Related reading: The bundle the concealed run is bought in: in wall speaker wire kit — in-wall-speaker-wire-kit

Related reading: The install the concealed run takes, start to finish: in wall speaker wire installation — in-wall-speaker-wire-installation

Frequently Asked Questions

Do I really need in wall speaker wire?

If the run goes behind the drywall, into the wall's cavity, the ceiling's joist space or the floor's bay, yes – those are the concealed paths the code reads the jacket for, and the CMR-rated stock is the wire they allow. If the run stays on the surface – the baseboard's clips, the desk, the floor under the rug – the general-purpose stock serves it at the same copper and the same signal. The answer is the run's path.

Can I use regular speaker wire behind drywall?

The concealed path is the one the code's listed-stock rule applies to, and the general-purpose jacket is not the listed stock. The inspection, the insurance and the resale all read the jacket's print at the wire the wall holds, and the unlisted run is the figure they read against. The regular wire is the surface path's buy, and the concealed run is the one the listed stock serves.

Does the code require in wall rated wire for speakers?

The concealed run is the path the listed-stock rule reaches – the wall, the ceiling, the floor the structure encloses – and the CMR jacket is the listing the communication circuit's concealed wire carries. The speaker line's low voltage puts it in the Class 2 circuit, and the jacket's rating is the figure the concealed path requires. The surface run is the path the rule does not reach, and the general-purpose stock serves it.

What if the house is already wired with regular wire in the wall?

The pre-wired run is the case the check reads at the wall's opening – the jacket's print the figure the run carries, and the general-purpose stock the one the concealed path's rating does not state. The retrofit's answer is the wire the run's jacket states: the listed stock the concealed path serves, and the replacement the figure the code reads at the wall. The check at the opening is the minute that tells what the run is before the system is built on it.

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