The sergeant who used a stun gun on a pregnant 17-year-old girl in the Bronx was too close for the device to be effective.

The NYPD advises officers to fire their Tasers 7 to 15 feet from the target so the Taser darts are far enough from each other to create a charge that can incapacitate the subject, a police official said.

The Taser company manual recommends a distance of 7 to 10 feet.

But the 47th Precinct sergeant was only a couple of feet from Dailene Rosario when he used the stun gun on her during the chaotic confrontation Friday night in the hallway of her Wakefield apartment building.

As a result, she felt a searing electric shock for five seconds and suffered deep puncture wounds and burns at the spots where the darts hit her — but she was not incapacitated, as is intended when a Taser is used.

“It’s like your whole side is on fire and you’re being stabbed at the same time,” Rosario told the Daily News on Tuesday. “The hook was embedded into my skin so they had to cut it to take both the Tasers (barbs) out.”

The cop’s encounter with Rosario, who is 14 weeks pregnant and lost a baby in September, was captured on cellphone video.

“It’s like your whole side is on fire and you’re being stabbed at the same time,” Dailene Rosario told the Daily News on Tuesday. “The hook was embedded into my skin so they had to cut it to take both the Tasers (barbs) out.”

(Sam Costanza/for New York Daily News) (Sam Costanza/for New York Daily News)

“It’s like your whole side is on fire and you’re being stabbed at the same time,” Dailene Rosario told the Daily News on Tuesday. “The hook was embedded into my skin so they had to cut it to take both the Tasers (barbs) out.”

“He’s standing too close to her,” said civil rights lawyer Debra Cohen. “That video begged the question why it was necessary to deploy the Taser. A stun gun is not going to take the place of hands-on control or patience and good judgment.”

The NYPD Patrol Guide advises cops to not knowingly use stun guns on pregnant women, children or people in frail health. Cops are also advised to take the size of the person they are trying to arrest into account before using the devices.

The NYPD’s Internal Affairs Bureau is investigating the incident. The Taser used on Rosario will be checked to see how many times she was shocked, a police official said.

The Bronx District Attorney’s office is also reviewing the incident, a law enforcement source said.

The confrontation happened as cops’ use of stun guns has nearly tripled since 2011, NYPD figures show.

Last year, cops used stun guns 503 times, compared to 178 instances five years earlier.

The incident made the Wednesday front page of the New York Daily News.

The Taser usage figures correspond with the rise in the number of the devices in use across the NYPD.

There were just 160 of the devices in 2006, compared to more than 1,700 by June 2016.

Cops came to Rosario’s building to check on an asthma patient, but stumbled across two men fighting in the hallway with about 15 rowdy onlookers and called for back up. About 10 more officers came, including the sergeant.

The NYPD learned of the video when it appeared in news reports, a police official said Wednesday.

Deputy Commissioner Joseph Reznick, head of Internal Affairs, was then notified.

“The video is troubling,” he said.

Rosario screams after the Taser shocks her in the hallway of her Bronx building.

(Photography is Not a Crime) (Photography is Not a Crime)

Rosario screams after the Taser shocks her in the hallway of her Bronx building.

In addition to Rosario, her neighbor Jose Aceaveda, 21, who was one of the men fighting, was arrested and charged with resisting arrest and disorderly conduct.

“We’re brothers. We don’t need you,” Aceaveda shouted at cops when they arrived.

His charges were dismissed.

The official said Rosario did not look pregnant, so the key to the investigation will be whether she told cops she was pregnant before or after being Tasered.

The video indicates it was beforehand.