PEC Sizes (0mm-76mm)

Metal covers for boxes shall be lined with firmly attached insulating material NOT less than

• 0.80 mm.

• 0.50 mm.

• 0.90 mm.

• 0.70 mm.

The construction of metal cabinets and cutout boxes shall be such as to secure strength and rigidity. If constructed of uncoated sheet steel, the metal thickness should NOT be less than

• 1.5 mm

• 1.8 mm

• 1.35 mm

• 2 mm

Cabinet and cutout boxes shall have an air space of at least ______ between the base of the device and the wall of any metal cabinet or cutout box in which the device is mounted.

• 1 mm

• 2 mm

• 3 mm

• 4 mm

In a damp or wet locations, cabinets and cutout boxes of the surface type shall be mounted with at least _____ air space between the enclosure and the wall.

• 4 mm

• 6 mm

• 6.4 mm

• 5 mm

In walls or ceilings of concrete, tile, or other non-combustible materials, boxes and fittings shall be installed that the front edge of the box or fitting will NOT set back of the finished surface more than

• 7 mm

• 4 mm.

• 5 mm

• 6.4 mm.

Nails where used as a fastening means, shall be permitted to pass through the interior of the enclosure if located within ____ of the back or ends of the enclosure.

• 5 mm

• 6.4 mm

• 4.3 mm

• 5.2 mm

Where flexible tubing is used to encase the conductors, the tubing shall extend from the last insulating support to NOT less than.

• 6.4 mm

• 4.3 mm

• 8.1 mm

• 5.2 mm

Enclosures for over-current devices in damp or wet locations shall be identified for use in such locations and shall be mounted so there is at least ____ air space between the enclosure and the wall.

• 11 mm

• 10 mm

• 20 mm

• 15 mm

In indoor wet locations, the entire wiring system including all boxes, fittings, control boards and panelboards shall be installed on walls with 10 mm minimum clearance.

• 20 mm

• 15 mm

• 30 mm

• 10 mm

Rosettes for use with conduit boxes or raceway shall have bases high enough to keep wire and terminals at least 10 mm from the surface wired over.

• 12 mm

• 20 mm

• 10 mm

• 15 mm