Adams Jack, Samuel Bitler J, Riley Karl
Merrimack College, North Andover, Massachusetts 01845, USA.
Bioelectromagnetics. 2004 Feb;25(2):102-6. doi: 10.1002/bem.10155.
We evaluated wiring in multifamily developments containing National Electrical Code(R) (NEC(R)) violations as a source of unusual exposure to 60 Hz magnetic fields. Two methods were used in this evaluation: measurement and modeling. We measured the building wiring as a source of magnetic fields in six multifamily developments in Michigan. In this small sample, building wiring proved to be an important source of exposure in four of the six cases. In all four cases with exposure from building wiring, one or more NEC violations were involved. To supplement our measurement efforts, we used computer modeling to compare magnetic field exposure due to building wiring with magnetic field exposure from external power lines. Our calculations showed that where the building wiring has a NEC violation leading to net current loops, the exposure due to wiring is likely to be more important than that from external power lines. Our results support the results obtained in a recent study of the exposure of Californian K-12 students to magnetic fields, where building wiring with one or more NEC violation was found to be the single most important exposure source. If 60 Hz magnetic fields are important to avoid, then improved enforcement of the NEC, as required by law, is perhaps the single most important mitigation policy to adopt. Bioelectromagnetics 25:102-106, 2004.
我们评估了存在违反《美国国家电气法规》（NEC）情况的多户住宅开发项目中的布线，将其作为60赫兹磁场异常暴露的一个来源。本评估采用了两种方法：测量和建模。我们在密歇根州的六个多户住宅开发项目中测量了作为磁场源的建筑物布线。在这个小样本中，在六个案例中的四个案例里，建筑物布线被证明是一个重要的暴露源。在所有四个因建筑物布线导致暴露的案例中，都涉及一项或多项违反NEC的情况。为了补充我们的测量工作，我们使用计算机建模来比较建筑物布线产生的磁场暴露与外部电源线产生的磁场暴露。我们的计算表明，当建筑物布线存在导致净电流回路的NEC违规情况时，布线产生的暴露可能比外部电源线产生的暴露更重要。我们的结果支持了最近一项关于加利福尼亚州K - 12学生磁场暴露研究的结果，该研究发现存在一项或多项违反NEC情况的建筑物布线是最重要的单一暴露源。如果要避免60赫兹磁场的影响，那么依法加强对NEC的执行力度可能是要采取的最重要的单一缓解政策。《生物电磁学》25:102 - 106，2004年。
