Parameters of flameproof joints of enclosures of electrical equipment of subgroup IIB

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Appendix 5. Characteristics of explosion-proof connections of explosion-proof equipment

Parameters of flameproof joints of enclosures of electrical equipment of subgroup IIB

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Encyclopedia of radio electronics and electrical engineering / Rules for the technical operation of consumer electrical installations (PTE)

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Table A5.3

Type of flameproof connection	Slit length L, mm	Maximum slot width, mm, for shell volume
Type of flameproof connection	Slit length L, mm	V ≤ 100 cm³	100 < V ≤ 2000 cm³	V > 2000 cm³
Flat and cylindrical connections	6,0 ≤ L < 12,5	0,20	-	-
	12,5 ≤ L < 25,0		0,20	0,15
	25,0 ≤ L		0,20	0,20
Control rods and rollers	6,0 ≤ L < 12,5		-	-
	12,5 ≤ L < 25,0		0,20	0,15
	25,0 ≤ L		0,20	0,20
Shafts with sleeve bearings	6,0 ≤ L < 12,5		-	-
	12,5 ≤ L < 25,0	0,25	0,20	0,15
	25,0 ≤ L < 40,0	0,30	0,25	0,20
	40,0 ≤ L	0,40	0,30	0,25
Shafts with rolling bearings	6,0 ≤ L < 12,5	0,30	-	-
	12,5 ≤ L < 25,0	0,40	0,30	0,20
	25,0 ≤ L < 40,0	0,45	0,40	0,30
	40,0 ≤ L	0,60	0,45	0,40

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