Short-circuit protection

DOE-SPEC-3021-97

Short-circuit protection. If accidental short circuiting

3.3.11.7.8

of certain wires could result in malfunction of

equipment such as closing or tripping of a circuit

breaker, do not terminate these wires on adjacent

terminal block points.

Continuity testing. Make provision for conveniently

3.3.11.7.9

field testing the continuity of all control circuits.

3.3.11.7.10

Markers. Provide wire markers on both ends of

each wire that is longer than 12 inches. Wire

markers shall have indelible designations in

accordance with Seller's wiring diagrams. The

markers shall be Thomas & Betts Co., Inc. "WB

Vari-Temp" or "WSL Self-Laminating," or equal.

Space. Provide adequate space on both sides of

3.3.11.7.11

the terminal blocks for connecting wires and for wire

markers. To allow for stripping and bending of

incoming cables, locate terminal strips at least

8 inches away from cable entrances at the top

and/or bottom of cabinets.

Current transformer connections. Shorting terminals

3.3.11.7.12

shall be provided for any current transformer

connections.

3.3.12

Cooling system. Cooling shall be by forced air. Locate low-velocity,

permanently-lubricated, redundant fans (the second to automatically start on

failure of the first) on the power-switching module directly below critical

components to ensure that the cooling air path is not obstructed. Fan failures

shall cause annunciation and an audible alarm to sound as specified in

paragraph 3.5.1.7. Equip all air inlets with standard type filters replacable from

outside the unit. Provide expanded metal guards on all air inlet and exhaust

openings. Each fan shall be on an individual ac-branch circuit.

3.4

Sound control.

3.4.1

Allowable sound level. The Owner will review the sound level of equipment

covered by this specification with respect to the permissible exposure limits for

personnel as defined in 29 CFR 1910.95. Accordingly, the sound level

measured at a distance of five feet from the outline of the equipment shall not

exceed 75 dB(A).

Acoustical treatment. If Seller expects the maximum sound level of the

3.4.2

equipment to exceed the specified allowable limit at a distance of five feet, Seller

shall use acoustical treatment features subject to Owner's review and

acceptance to achieve the sound control design objectives.