Gas ratio	IEC 60599 limits	Fault type case	Linguistic terms (L.T)
		PD, T₁, T₂, T₃	Very low (VL)
		NS	Low (L)
		D₂	Medium (M)
		D₁, D₂	High (H)
		D₁	Very High (VH)
		PD	Very low (VL)
		D₁, D₂	Low (L)
		D₂	Medium (M)
		T₁, T₂, T₃	High (H)
		T₁, T₂, T₃	Very High (VH)
		PD, T₁	Very low (VL)
		T₁	Low (L)
		D₁, T₂	Medium (M)
		D₁, D₂, T₂	High (H)
	4.0	D₁, D₂, T₃	Very High (VH)