OPINION
The plaintiff, Anthony Montuori, instituted this civil action to recover for property damage on his business premises. The damage resulted from a fire allegedly caused by the negligent maintenance of the electric power lines of the defendant, Narragansett Electric Company, a Rhode Island public utility corporation engaged in the distribution of electric power. The case was tried before a jury in the Superior Court. At the close of plaintiff’s case, the defendant made a motion for a directed verdict, which the trial justice denied. At the close of its own case, the defendant renewed its motion for a directed verdict. The trial justice reserved decision on the motion and submitted the case to the jury. The jury returned a verdict in favor of the plaintiff in the amount of $10,580, after which the trial justice denied the defendant’s motion for a directed verdict. The defendant now appeals from the judgment entered on the verdict.
On February 9,1979, we heard oral arguments on the sole issue of whether the trial justice properly denied defendant’s motion for a directed verdict. Believing, however, that the case raised other issues that were neither briefed nor argued, we did not issue a full opinion, rather, we directed the parties to brief and argue two additional issues: (1) whether the so-called “doctrine of exclusive control” has been or should be incorporated into the doctrine of res
ipsa loquitur
and (2) whether the plaintiff in this case could benefit from either theory.
Montuori v. Narragansett Elec. Co.,
R.I.,
I
In our earlier opinion, we stated that the questions presented by the trial court’s denial of the motion for a directed verdict were: (1) what a plaintiff must establish to escape a directed verdict and (2) whether the expert testimony relied upon by plaintiff spoke in terms of “probability” rather than “possibility” and thus overcame the limitations imposed by
Evans v. Liguori,
The plaintiff, Anthony Montuori, testified that at about midnight on the evening of October 10, 1972, the Providence police department informed him by telephone of a fire at his garage on Detroit Avenue in Providence. He stated that he had left the garage at about 11 p. m.; presumably, therefore, when the fire started, the garage was unoccupied. Montuori also testified that because a smoldering fire had destroyed the interior of his garage in July 1972, he had hired an electrician to rewire the entire electrical system to give it the capacity to handle 100 amperes of current, rather than 60 amperes. The electrician had installed a new service panel inside the garage, a new meter and meter trough on the outside wall, and a new conduit and wiring that ran from a weatherhead on the roof of the garage down to the meter. Raymond Rosa, a city electrical inspector, testified that on August 17, 1972, he had inspected plaintiff’s newly wired electrical system and had approved it as meeting the required standards. 1
Colonel Walter A. McQueeney, who in 1972 was Chief of the Providence police department, testified that at about 11:45 p. m. on October 10, 1972, as he was cruising in the vicinity of plaintiff’s garage, he observed a small flame on the service wire leading from one of defendant’s service poles to what he surmised was plaintiff’s garage. Colonel McQueeney testified that at that time he detected no evidence of a fire within the garage itself. He then reported the existence of the flame to headquarters and proceeded to a nearby restaurant. He testified that after having left the restaurant a short time later, he passed by plaintiff’s garage, which he described as an “inferno.” He also observed that the entire service wire was then afire.
The plaintiff’s expert witness, John W. King, an electrical engineer, testified that he had gone to plaintiff’s garage on the day after the fire and had made only a visual inspection of the interior equipment, the service panel, the outside meter, and the damaged, insulated conductors leading from defendant’s service pole. He stated that as a result of his inspection he could find nothing directly wrong with the interior equipment. His opinion of the cause of the fire was “[t]hat the conductor out on the cross-arm, for some reason, I don’t know why— have never seen it before — became [sic] in proximity with each other, so they were able to come in physical contact, copper to copper.” King theorized that the alleged contact had created a surge of electricity from the transformer and that although the pole serviced two other buildings, the overload went to ground through the garage wiring to plaintiff’s service panel. An electrical surge seeks the easiest way to ground, and King surmised that because the new wiring and equipment in plaintiff’s garage was "probably more healthy to serve as a ground than the next door neighbor’s house,” the surge had followed that path rather than any other.
On redirect examination, the plaintiff’s attorney sought to have King restate his opinion of the fire’s origin, despite the suggestion of alternative causes:
“Q And you are still saying it was outside the building — the cause was outside the building?
“A It is more likely to have been caused on the outside of the building than on the inside.”
The defendant’s sole witness, Bertrand Choiniere, an employee of defendant, who had taken photographs at plaintiff’s garage on the morning after the fire, offered no opinion of the cause of the fire 2 but did attempt to explain the cause of the flame observed on the wire by Colonel McQuee-ney. Choiniere stated that defendant’s service wires are of a gauge narrower than the gauge of the wires leading from the weath-erhead to the service panel; therefore, after an electrical fault has occurred, whether negligently caused or not, the narrower wires heat up more rapidly as the power overload surges through from the transformer to ground.
In ruling on a motion for a directed verdict, a trial justice must view all of the evidence in the light most favorable to the nonmoving party and must give that party the benefit of all reasonable and legitimate inferences that may properly be drawn from the evidence, without weighing the evidence or exercising his independent judgment in regard to the credibility of the witnesses who have testified.
Conlin v. Greyhound Lines, Inc.,
R.I.,
We have often restated the proposition that a reasonable and legitimate inference that someone was negligent is not necessarily warranted by the mere happening of an accident.
Salk v. Alpine Ski Shop, Inc.,
In
Burdick v. South County Public Service Co.,
From this record, we find little or no direct evidence that defendant negligently breached its duty of care. The plaintiff elicited testimony that defendant had a pole inspection system requiring replacement of old poles and equipment, when defendant determines that they have reached an unsafe condition. The plaintiff also produced evidence to show that in May 1972, defendant had replaced the service pole and equipment next to the pole that had serviced plaintiff’s garage. We do not believe, however, that standing alone, this evidence demonstrates that defendant negligently failed to replace the pole and equipment servicing the garage. Moreover, there is evidence to show that defendant in fact complied with its duty to inspect and approve the wiring newly installed after the July fire. The defendant received notice from the city electrical inspector and sent a crew to make the meter taps permanent.
The plaintiff attempted to establish defendant’s negligence primarily by circumstantial evidence and by inferences that the touching of bare electrical wires caused the fire in the garage. The plaintiff was unable to produce more than minimal direct evidence to establish the element of causation. Colonel McQueeney’s eyewitness testimony about the small flame on defendant’s service wire and the testimony relating to the postfire condition of the service panel, the meter, and the insulation on the conductors were elicited to raise the inference that defendant was causally responsible for the fire. The testimony that plaintiff had installed new wiring after the July fire, that the wiring had been inspected and approved, and that plaintiff had no electrical problems since the installation tended to refute any inference that plaintiff was responsible for the cause.
The plaintiff called an expert to posit a theory of causation in order to assist the trier of fact in its resolution of the controverted issues. Before the trier of fact will be allowed to infer negligence with the assistance of an expert’s opinion regarding causation, however, we require that opinion to be of substantial probative value.
See Evans v. Liguori,
“Expert testimony, if it is to have any evidentiary value, must state with some degree of positiveness that a given state of affairs is the result of a given cause. Absolute certainty, of course, is not required. In those cases where expert testimony is relied on to show that out of several potential causes a given result came from one specific cause the expert must report that the result in question ‘most probably ’ came from the cause alleged.” (emphasis in original) Sweet v. Hemingway Transport, Inc., 114 R.I. at355, 333 A.2d at 415 (citing Tabuteau v. London Guar. & Accident Co.,351 Pa. 183 ,40 A.2d 396 (1945)).
The standard set out in
Sweet
is not always easy to apply. In some cases, differing interpretations of the probative value of the testimony may be reached when the expert does not speak in a consistent tone. Here, during his testimony the expert acknowledged no fewer than six times that he was in effect “speculating.” On redirect examination, however, King stated that the fire was “more likely” to have been caused as he suggested, language closer to the
Sweet
standard. The defendant initially made a motion to strike King’s testimony as “merely speculation, merely guesswork as to what occurred.” The trial justice denied the motion, saying that “Mr. King was just being overly frank and truthful, and was being very cautious in the use of his words. * * * [Wjhile in many instances he did say ‘my best guess or speculation,’ he did in effect say that was his opinion based on his knowledge, expertise.” This court must look at the testimony in its entirety to determine whether the
Sweet
standard has been met. Having done so, we believe that King’s opinion was not based on a sufficient quantum of other competent evidence in the record and that his opinion failed to rise above the level of mere conjecture and surmise.
4
Furthermore, King’s testimony failed adequately to eliminate other plausible theories for the cause of the fire and in its totality failed to speak in terms of “probability.”
See Evans v. Liguori,
II
In
Montuori v. Narragansett Elec. Co.,
R.I.,
It was in 1891 that this court appears first to have recognized the principle of tort law that the happening of an accident, by itself, may amount to prima facie evidence of negligence, “where the cause or instrumentality of the accident is under the defendant’s control, and where such an accident does not ordinarily occur if the proper precautions be taken * *
Cox v. Providence Gas Co.,
Subsequent cases referred to the principle laid down in
Cox v. Providence Gas Co.,
and
Ellis v. Waldron,
both
supra,
expressly as the doctrine of
res ipsa loquitur. See, e. g., Motte v. First National Stores, Inc.,
In 1950, this court made its first explicit reference to the “doctrine of exclusive control” in
Eaton Realty Co. v. Petroleum Heat & Power Co.,
As a result of our examination of Rhode Island law on this particular question, we are thoroughly convinced that no rational distinction has ever existed between the doctrine of
res ipsa loquitur
and
The defendant argues that plaintiff should not be entitled to the benefit of the doctrine of res ipsa loquitur because he did not plead it in his complaint. The doctrine, however, is not a rule of pleading, and a plaintiff need not specifically aver that he plans to rely on the doctrine in order to rely on it later. We do believe, however, that a complaint ought to set out basic facts that would support the application of the doctrine, for example, the defendant’s control of the instrumentality responsible for the plaintiff’s injury. On the record before us, we find that plaintiff’s complaint adequately laid the foundation for later reliance on the doctrine.
More important to entitlement to the evidentiary boost afforded by the doctrine of
res ipsa loquitur
is that a plaintiff adduce competent evidence to satisfy the elements: (1) the event must be of a kind that does not ordinarily occur in the absence of someone’s negligence; (2) the agency or instrumentality causing the event must have been within the exclusive control of the defendant; (3) the event must not have been due to any voluntary act or contribution on the part of the plaintiff.
Wilkinson v. Vesey,
The plaintiff’s expert failed to establish with the required degree of certitude the cause of the fire that gutted the interior of the plaintiff’s garage.
See Sweet v. Hemingway Transport, Inc.,
The defendant’s appeal is sustained, the judgment appealed from is vacated, and the case is remanded to the Superior Court with direction to enter judgment for the defendant.
Notes
. The plaintiff’s electrician, after finishing the job, had notified the city electrical inspector. The inspector, after determining that the job complied with the standards of the National Electric Code and the City of Providence Code, wrote up his report and sent a notice of the inspection to defendant, Narragansett Electric Company. The defendant sent a crew to the garage to examine the job and to make permanent taps on the meter.
. He did, however, offer the opinion that the short circuit occurred in plaintiffs service panel. This opinion focused on the location of the electrical fault rather than on a specific cause.
. As a corollary to the company’s duty, the consumer has a “right to presume that [he] will not be injured in attempting to use that which the company furnishes * *
Burdick v. South County Public Service Co.,
. On our examination of the record before us, we believe that we can summarize King’s expert testimony as follows: assuming that the insulation on the conductors had worn away to such an extent that bare metal could touch bare metal, the resulting physical contact could have caused an electrical surge to seek ground in plaintiff’s garage and start a fire; a fire of electrical origin occurred; therefore, defendant’s wires came into physical contact. Although we would admit the existence of a minimal quantum of direct and circumstantial evidence in support of this reasoning, we still cannot avoid the view that this is a classic example of question-begging.
. The statement quoted from
Reynolds v. Narragansett Electric Lighting Co.,
. In a sense, our conclusion here contradicts the language in the first opinion,
Montuori v. Narragansett Elec. Co.,
R.I.,
.Pennsylvania courts had limited “the use of the Latin phrase ‘res ipsa loquitur’ to those cases in which the defendant owed the plaintiff the ‘highest degree of care.’ Included in this class of defendants were owners and operators of common carriers, elevators, and escalators, as well as suppliers of electrical power.”
Gilbert v. Korvette, Inc.,
. In
Coia v. Eastern Concrete Products Co.,
. We agree in principle with the Supreme Court of Pennsylvania that calling
res ipsa lo-quitur
a “doctrine” may not be appropriate.
Gilbert v. Korvette, Inc.,
