Cabinet Requirements

In general, consider the following factors during your site planning for systems in cabinets:

  • Elevated Operating Ambient Temperature—If installed in a closed or multi‐unit rack assembly, the operating ambient temperature of the rack environment may be greater than room ambient. Therefore, consideration should be given to installing the equipment in an environment compatible with the maximum ambient temperature (Tma) specified by the manufacturer.

  • Reduced Air Flow—Installation of the equipment in a rack should be such that the amount of air flow required for safe operation of the equipment is not compromised.

  • Mechanical Loading—Mounting of the equipment in the rack should be such that a hazardous condition is not achieved due to uneven mechanical loading.

  • Circuit Overloading—Consideration should be given to the connection of the equipment to the supply circuit and the effect that overloading of the circuits might have on overcurrent protection and supply wiring. Appropriate consideration of equipment nameplate ratings should be used when addressing this concern.

  • Reliable Earthing—Reliable earthing of rack‐mounted equipment should be maintained. Particular attention should be given to supply connections other than direct connections to the branch circuit (for example, use of power strips).

Make sure that the cabinet meets the following requirements:

  • The cabinet can support the weight of all of the components you plan to install in it. System Specifications provides the weights of ztC Endurance system components. To determine the weight of any peripheral components, see the documentation included with those components.

  • The cabinet contains two front and two rear vertical EIA rails, one in each corner of the cabinet, that have the universal hole pattern as defined in the EIA 310‐D Section 1 specification.

  • The front vertical rails extend at least 0.5 in. (1.27 centimeters (cm)) beyond the inside edge of the accessory leg, if present, to allow the mounting rails to be fitted.

  • The distance between the front vertical rails and the inside of the front door is at least 3.0 in. (7.62 cm).

  • The distance between the rear of the system chassis and the inside of the rear door is at least 6.0 in. (15.24 cm).

  • The distance between the front and rear vertical rails is between 24 in. and 31.5 in. (60.96 cm and 80 cm, respectively).

  • The vertical mounting rails have a 0.275 in. (7.0 mm) round or 0.375 in. (9.53 mm) square pattern, with a thickness between 0.063 in. ‐ 0.105 in.

  • The vertical mounting rails are plated, or some other method is used to ensure continuity for grounding between installed equipment.

  • Cable‐management brackets are provided to support and constrain data and power cords so that the cables do not interfere with air flow out of the rear of the modules, and so that the connectors do not disconnect or break.

  • To prevent stray voltages, all components are grounded together through the vertical mounting rails to the cabinet frame, and then to local building ground. To ensure signal quality, use a grounding cable for local building ground.

  • There is a plan for maintaining cables and wires to the cabinet by either running them under the floor or placing them overhead in an overhead cable tray.

  • Air flows through the cabinet from front to back.

  • Air does not recirculate within the cabinet.

  • Filler panels cover any unused rack space to prevent air recirculation.

  • Blockers are installed between the vertical mounting rails and the side panels at the rear of the cabinet.

  • Vents are evenly distributed on the front and rear doors and make up at least 69% of the surface area.

Caution: The cabinet must have vented front and rear doors to prevent the system from overheating while in operation.
Précaution: L’armoire doit avoir des portes avant et arrière ventilées pour empêcher le système de surchauffer pendant le fonctionnement.

  • The final installation conforms to all emission, immunity, safety, and other applicable regulations.

Notice: A ztC Endurance system allows you to install USB cables and USB flash drives in the front of the system, as well as various data and power cables in the rear of the system. The recommended clearance dimensions of 76 mm from front rails to the door, and 152 mm between the rear of the system chassis and the inside of the rear door, ensure that there are no clearance issues with the previously mentioned accessories or device. Although not recommended, a 1000 mm rack may be possible if the cabinet rails are skewed to the front, thus preventing use of accessories in the front of the system, while allowing more space for cabling in the rear.

Examples of recommended cabinets for system installation follow:

  • With a vertical PDU installed, xU high x 31.5 in. (800 mm) wide x 47.2 in. (1200 mm) deep. For example: APC™ NetShelter™ SV AR2580-42U

  • Without a PDU installed, xU high x 23.6 in. (600 mm) wide x 42.1 in. (1070 mm) deep. For example: APC NetShelter SX AR3104-24U