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Title: Magnetic shielding by ferromagnetic trunking in low-voltaqe installations
Authors: Du, Y 
Kong, S
Burnett, J
Keywords: Image source model
Inclined barrier
Insertion loss degradation
Reflection effect
Issue Date: 2000
Publisher: Hong Kong Institution of Engineers
Source: HKIE transactions, 2000, v. 7, no. 3, p. 34-39 How to cite?
Journal: HKIE transactions 
Abstract: Galvanized iron (Gl) trunking used for mechanical protection in low-voltage electrical installations has demonstrated some degree of magnetic shielding. This paper investigates extremely-low-frequency magnetic shielding by commercial Gl trunking based on numerical analysis and experimental studies. First general shielding characteristics are discussed where the shielding material is considered linear. Since galvanized iron is a ferromagnetic material, and exhibits non-linear properties associated with its permeability, the variation in shielding performance resulting from the nonlinearity is then discussed. The shielding impact of both source and shield parameters associated with ferromagnetic trunking is determined. It is concluded that galvanized iron trunking is a cost-effective shielding measure for LV electrical installations in buildings if properly designed and installed.
ISSN: 1023-697X
EISSN: 2326-3733
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