Other General Equipment Requirements

DOE-HDBK-1092-98

Branch circuit loading shall meet the requirements of Article 210 of the NEC. (See NEC Sections

210-21 through 210-23).

External convenience outlets should be connected to a separate circuit breaker.

Where 3 phase 4 wire service is utilized, the loads should be evenly distributed on all phases and there

should be consideration of sizing the neutral conductor for certain loads (such as computer

equipment) due to the presence of harmonic currents. (See NEC Sections 210-4 and 310-10).

9.4.1.2 OTHER GENERAL EQUIPMENT REQUIREMENTS

Rack power distribution components or assemblies must be listed by a Nationally Recognized

Testing Laboratory (NRTL), nationally recognized standards, or have the approval of the Authority

Having Jurisdiction (See Section 2.5).

9.4.2 CONDUCTORS AND CABLES SPECIFIC REQUIREMENTS.

Each type of internal wiring for equipment or an accessory shall be acceptable for the particular

application when considered with respect to (1) the current, ambient temperature, voltage, and other

conditions of service to which the wiring can be subjected, and (2) exposure to oil or grease.

The term "cables" refers to groupings of wires typically used for control signals, data, or DC power.

The term "cords" refers to AC power cords.

The basic insulation on each wire shall be rated for at least the maximum voltage to which the wire

is connected, and for at least the temperature it attains. (ANSI/ISA-S82.01-1988 Section 9.4.3)

Insulating tubing, sleeving, and tape shall be rated for at least the maximum voltage against which

it insulates, and for at least the temperature it attains. (ANSI/ISA-S82.01-1988 Section 9.4.4)

Power and signal wires should be routed separately within a chassis.

Wires shall be routed away from sharp edges, screw threads, burrs, moving parts, etc. Holes through

which wires are routed shall have smooth, well-rounded surfaces, or shall have a bushing. Clamps

for guides used for routing or wiring shall have smooth, well-rounded edges. Pressures exerted by

such clamps should not cause cold-flow or otherwise deform the basic insulation. (ANSI/ISA-

S82.01-1988 Section 9.4.2)

9.4.2.1 FLEXIBLE CABLES

Flexible cables may be used:

1. Where flexible cables and attachment plugs are furnished by the manufacturer as part of the

equipment to be mounted in the rack.

2. For connection of stationary equipment to facilitate their frequent interchange.

3. To prevent the transmission of mechanical vibration.

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