Hitachi GR2000 manual Dust Requirements

Dust conditions for this router must meet the criteria of Table 5-2 in falling-dust measurement or floating-dust mass density measurement. A sample process of falling-dust measurement is shown in Figure 5-1.

When the measured value exceeds the acceptable range, and when the conductor and insulator are heavily covered in dust, appropriate protection, such as shortening of the periodic inspection cycle, addition of a dust-proof case, and air purification are required depending on the humidity of the installation site.

Table 5-2 Dust Requirements

Environmental Item	Falling-Dust Measurement (%/W)	Floating-Dust Mass Density
		Measurement (mg/m3)
Dust	5 or below	0.15 or below

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