ASME A17.5:2004 pdf download.Elevator and escalator electrical equipment.
4 Enclosure construction
4.1 General
4.1.1
The enclosure of control equipment shall be constructed and assembled so that it will have the strength and rigidity necessary to resist the abuses to which it is likely to be subjected, without resulting in a hazard due to reduction of spacings, loosening or displacement of parts, or other serious defects.
4.1.2
An enclosure shall be constructed so as to reduce the risk of unintentional contact with enclosed electrical devices.
4.2 Thickness of cast-metal enclosures for live parts
A cast-metal enclosure of malleable Iron and die-cast metal or permanent mould cast aluminum, brass,
bronze, or zinc shall be used. It shall be
(a) not less than 2.4 mm (0.094 in) thick for an area that is greater than 15 500 mm2 (24 in2) or that has a dimension greater than 150 mm (6 in).
(b) not less than 1.6 mm (0.063 in) thick br an area that Is 15 500 mm2 (24 In2) or less and that has no dimensions greater than 150 mm (6 in). The area limitation may be obtained by the provision of suitable reinforcing ribs subdividing a larger area; and
(c) not less than 3.2 mm (0.125 in) at reinforcing ribs, door edges, and unthreaded conduit entries.
Thicknesses may be reduced If the enclosure complies with the requirements of the impact test of
Clause 19.5 of this Standard and the conduit connection tests of CSA C22.2 No. 14 or UI 508.
4.3 Thickness of sheet-metal enclosures for live parts
4.3.1
Except as specified in Clause 4.3.2, the thickness of sheet-metal enclosures shall be not less than that specified In Tables 1 and 2, except that at the peints at which a wiring system will be connected, uncoated steel shall be at least 0.78 mm (0.032 in) thick, zinc-coated steel at least 0.88 mm (0.034 in) thick, and non-ferrous metal at least 1.16 mm (0.045 in) thick.
4.3.2
The thickness of sheet metal for enclosures at points other than those at which a wiring system will be connected need not comply with the thickness requirements of Clause 4.3.1 II the enclosure complies with the compression and deflection test requirements in Clauses 19.8 and 19.9.
Note: Tobes 1 and 2 ore based on a unsform dellecpon of the enclosure surface for any given load concentrated at the centre of the surface, regardless of metal thickness.
4.1 General
4.1.1
The enclosure of control equipment shall be constructed and assembled so that it will have the strength and rigidity necessary to resist the abuses to which it is likely to be subjected, without resulting in a hazard due to reduction of spacings, loosening or displacement of parts, or other serious defects.
4.1.2
An enclosure shall be constructed so as to reduce the risk of unintentional contact with enclosed electrical devices.
4.2 Thickness of cast-metal enclosures for live parts
A cast-metal enclosure of malleable Iron and die-cast metal or permanent mould cast aluminum, brass,
bronze, or zinc shall be used. It shall be
(a) not less than 2.4 mm (0.094 in) thick for an area that is greater than 15 500 mm2 (24 in2) or that has a dimension greater than 150 mm (6 in).
(b) not less than 1.6 mm (0.063 in) thick br an area that Is 15 500 mm2 (24 In2) or less and that has no dimensions greater than 150 mm (6 in). The area limitation may be obtained by the provision of suitable reinforcing ribs subdividing a larger area; and
(c) not less than 3.2 mm (0.125 in) at reinforcing ribs, door edges, and unthreaded conduit entries.
Thicknesses may be reduced If the enclosure complies with the requirements of the impact test of
Clause 19.5 of this Standard and the conduit connection tests of CSA C22.2 No. 14 or UI 508.
4.3 Thickness of sheet-metal enclosures for live parts
4.3.1
Except as specified in Clause 4.3.2, the thickness of sheet-metal enclosures shall be not less than that specified In Tables 1 and 2, except that at the peints at which a wiring system will be connected, uncoated steel shall be at least 0.78 mm (0.032 in) thick, zinc-coated steel at least 0.88 mm (0.034 in) thick, and non-ferrous metal at least 1.16 mm (0.045 in) thick.
4.3.2
The thickness of sheet metal for enclosures at points other than those at which a wiring system will be connected need not comply with the thickness requirements of Clause 4.3.1 II the enclosure complies with the compression and deflection test requirements in Clauses 19.8 and 19.9.
Note: Tobes 1 and 2 ore based on a unsform dellecpon of the enclosure surface for any given load concentrated at the centre of the surface, regardless of metal thickness.
