AT&T Classic Mail Design Package 1.6 Instrukcja Użytkownika Pobierz pdf (Strona 80)

Equipment Physical Design Standards ATT-TP-76200, Issue 19

AT&T Services, Inc. June 2014

Section 10, Fire Resistance:

Reasons for Reassessment

Generally, equipment that have been determined to be acceptable for purchase from a fire

resistance perspective do not have to be re-evaluated or retested unless subsequent changes

to the equipment include one or more of the following:

1) A change in the manufacturer's unique equipment identifier.

2) A modification to an equipment assembly's enclosure that increases ambient air

circulation.

3) The addition of integral or separately mounted cooling fan(s) or a manufacture's

requirement or recommendation that fans be used with the equipment.

4) The substitution of metallic apparatus with combustible material.

5) A change in an equipment assembly's electrical protection circuitry that increases the

ampere rating of an overload protection device or affects the operational characteristics

of a cooling fan.

6) The addition of printed circuit board(s) to one or more existing printed circuit board.

7) The addition of vertically oriented printed circuit boards to the extent that overall circuit

board surface area within the unit is increased by 300 cm

(46.5 in.

8) Evolution of plug-in circuit packs used in equipment makes it questionable whether the

equipment accurately resembles its original test configuration.

Acceptance of new Equipment by “similarity” as compared with a previously Approved

Equipment.

Generally ,if a pizza box type equipment having the same size, weight, physical and electrical

properties as well as possessing the same material components to that of a equipment that

has been previously tested and passed for fire propagation characteristics, need not be tested

again.

A statement is required from an approved testing lab stating:

1) Equipment “A” contains same material as Equipment “B”

2) Equipment “A” has the same physical and electrical characteristics as equipment “B”

3) Equipment “A” has same fire propagation characteristics as Equipment “B”

Submit:

4) A test report with date and test results for Equipment “B”

5) Any exception taken during the test of Equipment “B”

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AT&T Classic Mail Design Package 1.6 Instrukcja Użytkownika Strona 80