10.1 Description of Test Unit

The table for evaluation shall be a standing height, four legged, free standing table. The table shall be nominally 60" (1,524mm) long, 24'' (609.6mm) deep, and 36'' (914.4mm) high (See Figure /#13). Leg and apron size and construction shall be to manufacturer's specification. A top of 1'' (25.4mm) thick 37-50 pcf medium density fiberboard shall be positioned on the table in a manner recommended by the manufacturer. The top dimensions will be such that it will overhang the cabinet perimeter by 1". Its weight shall be included in the test as live load. Tables can be represented by a very large range of styles and designs.

Figure 13.  Description of Test Table.

Products inclusive in this section of testing are: Free Standing Tables, Desks, Aprons mounted between two fixed areas such as a wall or Casework, Mobile Tables (Free Standing Tables on wheels or casters), Mobile Under Counter Units, Mobile Workstations, Adjustable Tables, Modular Tables, C-Frame Tables, L-Frame Tables, J-Frame Tables, and Tables for systems furniture. These table systems can all be classified as one of three types of tables: Fixed, Free Standing, and Mobile.

10.2 Table Static Load

10.2.1 Test Purpose of Test

This test will challenge the table components to loads that are normal for use in a laboratory.

10.2.2 Test Procedure

Load the table top by using solid steel bars (per Section #3.1), each weighing 50 pounds (22.68 Kg), stacked evenly and spaced per Figure #14. Load the table to the manufacturer's recommended live load. These evenly distributed loads should be no less than 300 pounds (136.08 Kg) for mobile, 600 pounds (272.16 Kg) for free standing and 2000 pounds (907.20 Kg) for fixed. Include the weight of the working surface as live load.*

Figure 14.  Table Static Load Test Configuration

*Table load will vary considerably. Factors impacting live load capability include the size of the table, material, amount of drawers and book compartments, glide or caster load rating. Contact manufacturer for live load specifications.

10.2.3 Acceptance Level

No structural breakage shall result from application of the load. With the full load, the apron rails shall not deflect more than 1/360 of the span of the table and not to exceed 1/8" (3.175mm). In the case of a table with a drawer, the deflection of the rail shall not interfere with the function of the drawer. After the load is removed, inspect the table for structural damage.

10.3 Table Racking

10.3.1 Purpose of Test

This test will demonstrate the structural integrity of the table construction when subjected to a racking load. Most racking failures occur upon dragging an unloaded table across a floor. The ability of a table to resist a racking load will indicate less damage to the structure. The following tests were based on and adapted from ANSI/BIFMA X5.5-1989 American National Standard for Office Furnishings "Desk Products Tests." Adjustments have been made to better accommodate the specific applications of tables used in laboratories.

10.3.2 Test Procedure

The table shall be tested in its normal upright position, with floor glides or casters fully retracted and blocked to prevent the table from sliding. The table shall then be positioned at 45 degrees, with one pair of legs on the floor and the other raised and supported (See Figure #15). The unit shall remain in this position for thirty minutes. The unit shall be lowered without shock to the leveled surface and the general operation of the drawers shall be evaluated. The procedure shall be repeated on the opposite end.

Figure 15.  Table Racking Test Configuration.

10.3.3 Acceptance Level

When returned to normal position, the operation of the table shall be normal, and there will be no signs of permanent damage.

  Footnotes