Electrical standards

March 4, 2005
Robert Anglen, Arizona Republic

The issue: Electrical standards

RUGGIERI: Electrical standards and codes misapplied

Ruggieri says Taser has misapplied electrical codes and standards to suggest the Taser is safer than it really is. He says Taser uses a graphic chart to suggest that Underwriters Laboratories, a non-profit agency that certifies products for electrical safety, has certified Taser. Taser claims the graph shows the stun gun is far below the threshold of ventricular fibrillation.

He points out that a Consumer Product Safety Commission in 1976 studied a much weaker version of the stun gun than police use today and found that the threshold of ventricular fibrillation lowers with repeating pulses of electricity used by the stun gun.

Ruggieri says he was unable to replicate Taser's findings using any of the standards that Taser cites. Ruggieri says that rather than rely on the wrong standards, he has relied on scientific and medical research.

TASER'S POSITION: Expert's findings are "ludicrous"

Taser says Ruggieri's findings are "ludicrous," maintaining that there would be thousands of cases of ventricular fibrillation if his findings were accurate. Officials accuse Ruggieri of misapplying the electrical standards.

Taser points to the graph, saying the Taser pulse is 10 times below the threshold for ventricular fibrillation set by UL and by the Electro-technical Commission standards. The graph was developed by a private research firm and has been touted in Taser marketing material.

Taser says Ruggieri erred in considering the power of the stun gun, making it seem more powerful than it actually is.

Taser officials also say Ruggieri intentionally applied the wrong IEC standard to increase the negative findings against Taser.

INDEPENDENT ANALYSIS: Lab: Taser used wrong study

Underwriters Laboratories, which has certified billions of consumer goods for electrical safety, says the graph that Taser is using does not reflect any study of the stun gun's safety.

UL spokesman Paul Baker says the graph is supposed to apply to an electric fence. "We take issue with that data in relation to Taser," he said. "Underwriters Lab does not agree with Taser."

The graph is based on a decades-old study that measured how much current passing through an electric fence it would take to induce ventricular fibrillation.

Baker said he is surprised that Taser is still using the graph since the lab publicly stated last month that it has no bearing on the stun gun.

As for the IEC standards, Ruggieri sits on the committee charged with developing and maintaining those standards. He has also helped write standards for Underwriters Laboratories. He said the standards Taser cites do not address repeating pulses used by the stun gun.