OPINION
RABINOWITZ, Justice.
Charles Harned (Harned)1 filed suit against Dura Corporation (Dura) seeking compensation for injuries he sustained when a portable compressed air tank allegedly manufactured by Dura’s predecessor in interest, Electronics, Inc.,2 exploded and severed his left arm. The jury unanimously entered a defense verdict, and Harned appealed, challenging three rulings of the superior court.
On July 25,1977, Harned was working as a general mechanic at A & M Motors, a Winnebago dealership. As he filled a portable air tank from a compressor, the tank exploded and a piece of it severed his left arm at the elbow. Harned sued Dura, corporate successor to the manufacturer of the tank, alleging that the explosion was caused by the defective design and manufacture of the tank. He asserted that the tank should have contained a valve at the bottom which could be opened to drain moisture accumulating inside. Since it did not, water remained inside, causing the tank to corrode and finally explode when the weakened walls were unable to withstand the pressure of the compressed air. Dura denied that the tank was manufactured by Electronics, Inc. and claimed that the explosion was caused by poor maintenance rather than defective design.
LIMITATION OF CROSS-EXAMINATION
Harned contends that the superior court erred in limiting the scope of his cross-examination of Harold Pendell, a mechanical engineer who testified as an expert witness on Dura’s behalf. Pendell was asked by Dura whether, in his opinion, the tank that injured Harned complied with American Society of Mechanical Engineers (ASME) standards. He responded that the tank did not need to conform to the ASME Code since it was not legally binding in every state. The record further indicates that had Pendell been permitted to continue, he would have testified that the Code had not been adopted in South Dakota at the time the tank was manufactured.3 Harned objected to this line of questioning on the ground that Pendell was not qualified to testify concerning compliance requirements in Alaska. His objection was sustained on the ground that the court would instruct the jury regarding relevant legal standards. Harned later inquired of the court whether he could cross-examine Pendell regarding the tank’s compliance with the ASME Code. The superior court indicated it would not permit this questioning since Dura had not pursued on direct its line of inquiry regard[7]*7ing the Code. Harned did not object to this implied restriction.4
On appeal, Harned argues that had he been permitted to cross-examine on the subject, he would have elicited testimony from Dura’s expert witness confirming the fact that the tank did not conform to ASME standards. He contends that he chose not to pose these inquiries at trial, construing the superior court’s remark as a “threat” that such questions would “open the door” to “irrelevant and prejudicial” testimony regarding South Dakota law. Harned argues that such a “threat” unreasonably restricted his “absolute right” of cross-examination. Alaska Airlines, Inc. v. Sweat, 568 P.2d 916, 931 (Alaska 1977).
We hold that Harned’s failure to lodge a contemporaneous objection to the superior court’s cross-examination ruling precludes consideration of this issue on appeal.5 Matter of C.L.T., 597 P.2d 518, 522-23 (Alaska 1979); Chugach Electric Ass’n v. Lewis, 453 P.2d 345, 349 (Alaska 1969).
On the other hand, this court will consider plain error, even though not objected to below, if it is so substantial as to result in a miscarriage of justice. Matter of C.L.T., 597 P.2d at 523. Even if we assume Harned was correct in alleging the superior court acted improperly in limiting the scope of his cross-examination of Pen-dell, we do not believe it was so substantial as to result in a miscarriage of justice. Had Pendell testified on cross-examination that the tank did not conform to ASME standards, his testimony would have been merely cumulative.6 In this regard, Harned’s expert witness had previously testified that the tank which caused the injury did not comply with the ASME Code. Moreover, Pendell himself stated that he would not design a tank in accordance with specifications similar to those of the tank that injured Harned. Accordingly, we conclude that invocation of the plain error doctrine to reach this issue of a purportedly erroneous limitation of cross-examination would be inappropriate.
EXCLUSION OF EVIDENCE IN REBUTTAL OF DURA’S OPENING STATEMENT
Harned argues that the superior court erred in refusing to permit him to rebut an assertion made by Dura’s counsel during his opening argument. Although we have concluded that the remarks in question were improper, and that Harned should have been allowed to introduce “curative” evidence on rebuttal, we conclude that the error is harmless.
Dura’s counsel made the following statement during his opening argument:
We will also call John Oldham. Now, John Oldham is one of the vice presidents for Dura Corporation. And he of course will testify as to one matter, and that is that — and I’ll go back to the tank, because we have all these tanks popped open here — that in no case, not in any one of these cases, has Dura Corporation been found negligent. In these cases. And that’s important. I think that’s important. These cases — these tanks may be [8]*8open, but I think it’s important to note that in not any incident which Plaintiff is going to refer to has there been a finding of negligence. And that’s an issue which I think you should keep in mind.
Harned contends that this passage referred to inadmissible evidence, that it was extremely misleading, and that he should have been permitted to counter its prejudicial effect either with testimony regarding the disposition of the other lawsuits pertaining to tanks manufactured by Dura which had exploded, or with a reference in closing argument to Dura’s failure to produce Mr. Oldham.
Harned is correct in claiming that Dura’s counsel exposed the jury to prejudicial argumentation in his opening statement. In general, prior verdicts are not relevant in subsequent trials involving different parties and factual settings. It follows that it is improper for counsel to advert to the disposition of the same or similar cases during argument to the jury.7 Dura does not suggest that the testimony of Mr. Oldham would have been relevant to an issue properly before the court.8 Thus, counsel’s statement constituted a reference to inadmissible and potentially prejudicial evidence which should have been excluded upon proper objection.9
Harned did not raise an objection to the statements of Dura’s counsel at the time they were made. However, during the presentation of his case he attempted to introduce testimony regarding litigation that arose from one of the explosions. Dura’s objection that the preferred testimony was irrelevant was sustained,10 and subsequently Mr. Oldham was not called as a witness by Dura.
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OPINION
RABINOWITZ, Justice.
Charles Harned (Harned)1 filed suit against Dura Corporation (Dura) seeking compensation for injuries he sustained when a portable compressed air tank allegedly manufactured by Dura’s predecessor in interest, Electronics, Inc.,2 exploded and severed his left arm. The jury unanimously entered a defense verdict, and Harned appealed, challenging three rulings of the superior court.
On July 25,1977, Harned was working as a general mechanic at A & M Motors, a Winnebago dealership. As he filled a portable air tank from a compressor, the tank exploded and a piece of it severed his left arm at the elbow. Harned sued Dura, corporate successor to the manufacturer of the tank, alleging that the explosion was caused by the defective design and manufacture of the tank. He asserted that the tank should have contained a valve at the bottom which could be opened to drain moisture accumulating inside. Since it did not, water remained inside, causing the tank to corrode and finally explode when the weakened walls were unable to withstand the pressure of the compressed air. Dura denied that the tank was manufactured by Electronics, Inc. and claimed that the explosion was caused by poor maintenance rather than defective design.
LIMITATION OF CROSS-EXAMINATION
Harned contends that the superior court erred in limiting the scope of his cross-examination of Harold Pendell, a mechanical engineer who testified as an expert witness on Dura’s behalf. Pendell was asked by Dura whether, in his opinion, the tank that injured Harned complied with American Society of Mechanical Engineers (ASME) standards. He responded that the tank did not need to conform to the ASME Code since it was not legally binding in every state. The record further indicates that had Pendell been permitted to continue, he would have testified that the Code had not been adopted in South Dakota at the time the tank was manufactured.3 Harned objected to this line of questioning on the ground that Pendell was not qualified to testify concerning compliance requirements in Alaska. His objection was sustained on the ground that the court would instruct the jury regarding relevant legal standards. Harned later inquired of the court whether he could cross-examine Pendell regarding the tank’s compliance with the ASME Code. The superior court indicated it would not permit this questioning since Dura had not pursued on direct its line of inquiry regard[7]*7ing the Code. Harned did not object to this implied restriction.4
On appeal, Harned argues that had he been permitted to cross-examine on the subject, he would have elicited testimony from Dura’s expert witness confirming the fact that the tank did not conform to ASME standards. He contends that he chose not to pose these inquiries at trial, construing the superior court’s remark as a “threat” that such questions would “open the door” to “irrelevant and prejudicial” testimony regarding South Dakota law. Harned argues that such a “threat” unreasonably restricted his “absolute right” of cross-examination. Alaska Airlines, Inc. v. Sweat, 568 P.2d 916, 931 (Alaska 1977).
We hold that Harned’s failure to lodge a contemporaneous objection to the superior court’s cross-examination ruling precludes consideration of this issue on appeal.5 Matter of C.L.T., 597 P.2d 518, 522-23 (Alaska 1979); Chugach Electric Ass’n v. Lewis, 453 P.2d 345, 349 (Alaska 1969).
On the other hand, this court will consider plain error, even though not objected to below, if it is so substantial as to result in a miscarriage of justice. Matter of C.L.T., 597 P.2d at 523. Even if we assume Harned was correct in alleging the superior court acted improperly in limiting the scope of his cross-examination of Pen-dell, we do not believe it was so substantial as to result in a miscarriage of justice. Had Pendell testified on cross-examination that the tank did not conform to ASME standards, his testimony would have been merely cumulative.6 In this regard, Harned’s expert witness had previously testified that the tank which caused the injury did not comply with the ASME Code. Moreover, Pendell himself stated that he would not design a tank in accordance with specifications similar to those of the tank that injured Harned. Accordingly, we conclude that invocation of the plain error doctrine to reach this issue of a purportedly erroneous limitation of cross-examination would be inappropriate.
EXCLUSION OF EVIDENCE IN REBUTTAL OF DURA’S OPENING STATEMENT
Harned argues that the superior court erred in refusing to permit him to rebut an assertion made by Dura’s counsel during his opening argument. Although we have concluded that the remarks in question were improper, and that Harned should have been allowed to introduce “curative” evidence on rebuttal, we conclude that the error is harmless.
Dura’s counsel made the following statement during his opening argument:
We will also call John Oldham. Now, John Oldham is one of the vice presidents for Dura Corporation. And he of course will testify as to one matter, and that is that — and I’ll go back to the tank, because we have all these tanks popped open here — that in no case, not in any one of these cases, has Dura Corporation been found negligent. In these cases. And that’s important. I think that’s important. These cases — these tanks may be [8]*8open, but I think it’s important to note that in not any incident which Plaintiff is going to refer to has there been a finding of negligence. And that’s an issue which I think you should keep in mind.
Harned contends that this passage referred to inadmissible evidence, that it was extremely misleading, and that he should have been permitted to counter its prejudicial effect either with testimony regarding the disposition of the other lawsuits pertaining to tanks manufactured by Dura which had exploded, or with a reference in closing argument to Dura’s failure to produce Mr. Oldham.
Harned is correct in claiming that Dura’s counsel exposed the jury to prejudicial argumentation in his opening statement. In general, prior verdicts are not relevant in subsequent trials involving different parties and factual settings. It follows that it is improper for counsel to advert to the disposition of the same or similar cases during argument to the jury.7 Dura does not suggest that the testimony of Mr. Oldham would have been relevant to an issue properly before the court.8 Thus, counsel’s statement constituted a reference to inadmissible and potentially prejudicial evidence which should have been excluded upon proper objection.9
Harned did not raise an objection to the statements of Dura’s counsel at the time they were made. However, during the presentation of his case he attempted to introduce testimony regarding litigation that arose from one of the explosions. Dura’s objection that the preferred testimony was irrelevant was sustained,10 and subsequently Mr. Oldham was not called as a witness by Dura. In addition, the superior court did not permit counsel for Harned to rebut Dura’s statement during closing argument, or to discuss the fact that Dura had failed to produce Oldham’s promised testimony. The superior court in so ruling reasoned in part that to permit such an argument would constitute “an incursion into [irrelevant] areas that need not be rehashed after two weeks [of trial].” The superior court [9]*9concluded that the standard instruction informing the jury that “[sjtatements and arguments of Counsel are not evidence in the case” would cure any alleged harm caused by the questioned remarks of Dura’s counsel made during opening argument.
In light of his diligent efforts to introduce evidence to rebut Dura’s statement regarding the disposition of prior litigation, we are persuaded that Harned’s failure to raise an immediate objection to the questioned statements did not constitute a “waiver” of this claim.11 As to the merits of this specification of error we conclude that Harned’s proffered rebuttal testimony and final argument was improperly excluded. As we observed in Patricia R., “there are circumstances in which the introduction of inadmissible evidence requires responding evidence .... ” 631 P.2d at 97.12 The remark made by Dura’s counsel was potentially misleading and referred to evidence which was irrelevant and possibly prejudicial. Although Harned did not make an offer of proof regarding the content of the testimony excluded by the superior court’s ruling, it is apparent that it bore upon the disposition of prior cases arising from explosions of Electro-Magic tanks. Under the circumstances, however, the testimony or argument should have been allowed under the doctrine of “curative admissibility.”13
Nevertheless, we hold that the exclusion of Harned’s rebuttal evidence and argument is not sufficiently prejudicial to warrant reversal. McCracken v. Davis, 560 P.2d 771, 774-75 (Alaska 1977); Sloan v. Atlantic Richfield Co., 541 P.2d 717, 722 n. 9 (Alaska 1975). As we held in Martinez v. Bullock, 535 P.2d 1200, 1206-07 (Alaska 1975), if the error did not significantly affect substantial rights it is harmless and the judgment on the verdict should be affirmed in accordance with Alaska R.Civ.P. 61.14
[10]*10The question of whether or not the erroneous exclusion of Harned’s rebuttal evidence was “harmless” should not be decided by mechanistic formulae.15 Our conclusion that the error was harmless rests on the fact that a week intervened between opening arguments and submission of the case to the jury for deliberation. During that period, the jury heard several days of testimony from numerous witnesses. Throughout this testimony no further mention was made regarding prior litigation, nor was the questioned statement reiterated by Dura’s counsel during closing argument. Of further significance is the fact that the jury was specifically instructed it was “to consider only the evidence in the case” and that “[statements and arguments of Counsel are not evidence in the case.” Thus we think it unlikely that the jury ignored all the testimony which was produced as well as the trial court’s admonition, and reached its decision on the basis of an ambiguous remark made by Dura’s counsel in his opening argument. Under these circumstances, we conclude that Harned was not substantially prejudiced by the exclusion of rebuttal evidence or argument he sought to make. Therefore we hold that the superior court’s ruling did not constitute prejudicial error.
NONCOMPLIANCE WITH THE DESIGN STANDARDS OP THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS WAS NEGLIGENCE PER SE
Dura conceded at trial that the tank which exploded and injured Harned did not comply with applicable design and construction standards set out in the American Society of Mechanical Engineers (ASME) Code.16 The Code had been incorporated by reference into Alaska law at the time the tank was manufactured.17 Relying on our [11]*11decision in Ferrell v. Baxter, 484 P.2d 250 (Alaska 1971), Harned requested a jury instruction stating that a violation of the ASME standard constituted negligence per se.18 The superior court rejected this instruction, advising the jury that noncompli-anee by Dura should be deemed “mere evi-denee” of negligence and that, as the parties had stipulated, the ASME Code had not been adopted in South Dakota until 1974.19
In this appeal Harned argues that the jury should have been instructed that a violation of the ASME Code by Dura constituted negligence per se. The superior court refused to give a negligence per se instruction because the ASME Code had not been [12]*12adopted by South Dakota at the time the tank was manufactured.20 Harned notes that before this court Dura now concedes that the superior court erred in its resolution of the conflict of laws question and that it should have looked to the law of Alaska to define the appropriate standard of care rather than to the law of South Dakota. In turn, Dura advances two alternative theories upon which it contends that the superior court’s refusal to give a negligence per se instruction can be sustained.21
In assessing the merits of Harned’s contention that the superior court erred in refusing to instruct the jury that a violation of the ASME Code would constitute negligence per se, we have applied the analytical scheme set out in State Mechanical, Inc. v. Liquid Air, Inc., 665 P.2d 15 at 18-19 (Alaska 1983). As we observed in State Mechanical, the superior court should conduct a two-step inquiry in determining whether a negligence per se instruction is appropriate. First, it must decide whether the conduct at issue lies within the ambit of the statute or regulation in question, by applying the four criteria set out in the Restatement (Second) of Torts § 286 (1971)22 This threshold determination is strictly a legal conclusion, and we will exercise our independent judgment in deciding whether the superior court interpreted the scope of the statute or regulation correctly. See State Mechanical at 19.
Once it has concluded that the enactment applies to the allegedly negligent conduct, the superior court may exercise its discretion to refuse to give the negligence per se instruction. Such discretion is extremely limited, being confined to those “highly unusual cases” in which “laws may be so obscure, oblique or irrational that they could not be said as a matter of law” to provide an adequate standard of due care, Ferrell v. Baxter, 484 P.2d at 260, or to those where the enactment amounts to little more than a duplication of the common law tort duty to act reasonably under the circumstances. Bailey v. Lenord, 625 P.2d 849, 856 (Alaska 1981); Northern Lights Motel, Inc. v. Sweaney, 561 P.2d 1176, 1183 (Alaska 1977); Bachner v. Rich, 554 P.2d 430, 440—42 (Alaska 1976). The superior court’s disposition of the question of whether the enactment was too vague or arcane to be utilized as a reasonable standard of care will only be reversed on appeal if it constitutes an abuse of discretion. See State Mechanical at 19.
Applying this analysis to the case at bar, we conclude that the trial court erred in declining to instruct the jury that Dura’s failure to manufacture the tank in accordance with ASME standards constituted negligence per se. Our threshold determination that the ASME code governed Dura’s conduct in manufacturing the tank which exploded and injured Harned, was based on [13]*13an independent analysis under § 286 of the Restatement (Second) of Torts of the scope of pertinent statutory and regulatory provisions. Dura concedes on appeal that Alaska law should be applied to determine the applicable standard of care, and does not contest the fact that the ASME Code was incorporated by reference into Alaska law at the time the tank was manufactured, see supra note 17. However, Dura claims that the legislature did not intend to regulate the manufacture of pressure vessels under AS 18.60.18O-.395 and that Harned was not within the class of persons protected by those provisions. We have recast and considered these contentions within the analytical framework delineated by the Restatement.
Dura’s principal argument is that the “hazard” which the legislature intended to prevent by enacting these provisions was the installation and utilization — not the manufacture — of unfired pressure vessels which did not comply with the ASME Code. Thus, Dura concludes, a negligence per se instruction would have been inappropriate under § 286(d) of the Restatement. See supra note 22. In support of this contention, Dura cites numerous provisions within AS 18.60.180-.395 which specifically regulate only the installation and operation of boilers and unfired pressure vessels.23
We find this argument without merit. AS 18.60.180, the introductory provision which expressly enables regulatory authorities to adopt the “Boiler Construction Code,” specifically commands them to formulate “rules and regulations for the safe and proper construction of unfired pressure vessels.” 24 The Code itself was clearly promulgated to establish nationwide construction standards. See provisions set out supra at note 16. Dura’s contention that the utilization, but not the manufacture, of unfired pressure vessels is subject to AS 18.-60.180-.395 is patently illogical. How can the manufacture of unsafe vessels be permissible if their utilization is not. Thus, we conclude that the manufacture of vessels whose design does not conform to standards set out in the ASME Code is the type of “hazard,” for purposes of § 286(d), which the legislature intended to curtail by enacting AS 18.60.180-395.
Dura’s second argument against the propriety of a negligence per se instruction rests upon § 286(a). Dura contends that the tank which injured Harned fell within the exemption set forth in former AS 18.-60.210(a)(5), amended by 1981 SLA ch. 21 § 1, for “unfired pressure vessels having a volume of five cubic feet or less when not located in places of public assembly” and that Harned was not within the “class” of persons protected by the statute since he was not working in a “place of public assembly” at the time the explosion occurred. It is uncontroverted that the tank which exploded and injured Harned had a capacity of somewhat under 1.18 cubic feet.25 How[14]*14ever, considerable dispute exists regarding the question of whether or not the A & M Motors repair shop was a “place of public assembly” for purposes of AS 18.60.-210(a)(5).
We do not find it necessary to reach this issue since we conclude that manufacturers should not be permitted to rely upon AS 18.60.210(a)(5). Manufacturers have a duty under AS 18.60.180 and 8 AAC 80.010(a) to construct pressure vessels in accordance with ASME standards. As a rule, they have no control over where the tanks they produce will be utilized. From Dura’s standpoint, it was a fortuity that this vessel arguably fell within the scope of AS 18.60.-210(a)(5).26 Dura’s duty to comply with ASME construction standards arose during the manufacture of the tank in question; it should not be diminished retrospectively because it happened to be utilized at A & M Motors. Thus, Dura did have a duty to Harned under § 286(a) to manufacture the tank in accordance with the ASME Code, regardless of where he was at the time the explosion occurred.
Therefore, we conclude as a matter of law that under AS 18.60.180-.395 and 8 AAC 80.010(a) Dura was impressed with a duty to manufacture the tank in question in accordance with ASME standards.27 Furthermore, we find it unnecessary to permit the superior court on remand to use its discretion to decide whether the ASME Code was too obscure, vague or arcane to serve as an appropriate standard of care. As it is both extremely precise and nationally recognized we conclude, as a matter of law, that it should be adopted as the relevant standard of care on retrial.28
REVERSED and REMANDED for a new trial.