Minco
Tel: 763. 571.3121 • Fax: 763. 571.0927 • www.minco.com • Doc. #1116290(D)
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articulate accessibility probe applied in every possible position to the exterior or
exposed surfaces, including the bottom, or b) the IEC rigid accessibility probe applied
with a maximum force of 30 Newtons (6.75 lbs force) in every possible position to the
exterior or exposed surface, including the bottom, touches the part.
1.2 Protection from Fire - If the enclosure is non-metallic, it shall have the proper
flammability rating as detailed within ANSI/ISA Standard S82.01.
1.3 Grounding - A metallic enclosure must have a protective grounding terminal and
be marked as such. The size of the ground terminal is to be equivalent to the size of
the supply circuit conductor terminals. All accessible non-current conductive parts
must be bonded to the protective grounding terminal.
1.4 General Construction - The equipment enclosure, or parts of the enclosure,
required to be in place to comply with the requirements for protection from electric
shock, personal injury, protection from internal parts and wiring, and external cord
and cable assembly strain relief shall comply with the following tests for mechanical
strength:
a. Impact Tests - The equipment shall be held firmly against a rigid support and shall
be subjected to sets of three blows from a spring-operated impact hammer. The
hammer shall be applied to any external part that when broken is likely to expose live
parts. A window of an indicating device shall withstand an impact of 0.085 Newton-
meter (0.753-pound force-inch) from a hollow steel impact sphere 50.8 mm (2 inches)
in diameter and an approximate mass of 113.4 grams (4 ounces).
b. Pressure Tests - A force of 90 Newtons (20 pounds) shall be applied from a metal
rod 12.7 mm (.50 inch) in diameter, the end of which is rounded. The force shall be
applied for one minute to any point on the overall enclosure except the bottom. The
bottom shall sustain a force of 65 Newtons (15 pounds).
c. Tip Stability Test - Equipment having a weight of 11 kilograms (24 pounds) or
more shall not tip over when placed at the center of an inclined plane that makes an
angle of 10 degrees with the horizontal and then turned to the position (with all
doors, drawers and other openable and sliding parts in the least stable position) most
likely to cause tip-over.
