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Cisco AS5800 Universal Access Server Regulatory Compliance and Safety Information 11

Dial Shelf Card Safety Recommendations

You must follow these safety instructions when installing T1, E1, or T3 trunk cards in a Cisco 5814

dial shelf. Failure to install dial shelf cards in accordance with these instructions will invalidate the

approval.

• The dial shelf card might contain safety extra-low voltage (SELV) circuitry. Ensure that

attachments at the interconnection ports of the apparatus are also SELV circuits. (SELV circuits

are so designed and protected that, under both normal conditions and likely fault conditions, the

voltage that can be drawn is not hazardous.)

• Do not work on the system or connect and disconnect cables during a lightning storm.

Note The host chassis should always be connected to earth ground during normal use.

• The the dial shelf card gets hot during operation, refer to the card handling warning, page 26.

If you have any doubt as to how to safely install a system component correctly in a Cisco 5814 dial

shelf, please contact a qualiﬁed telecommunications engineer.

General Installation Requirements

This section describes the general installation requirements for any dial shelf card installed in a

Cisco 5814 dial shelf.

Where applicable, each trunk card and modem card is approved only for installation in a host and

with host attachments, which are either type approved for such apparatus or covered by a General

Approval. Clearance and creepage distances of X millimeters (mm) and Y mm, as listed in Table 1,

must be maintained between the dial shelf card and other parts of the host, including any other dial

shelf cards.

Creepage distance is deﬁned as the minimum distance between two points (following the contour of

the insulator) measured across the surface of an insulator. Clearance distance is deﬁned as the

minimum distance between two points (line of sight) measured in air.

Table 1 Creepage and Clearance Distances Based on Voltage

Clearance and creepage distances are measured between adjacent parts, as shown in Figure 6.

Voltage Used or Generated by Other Parts

of the Host or dial shelf Card (Vrms

or VDC

)

1. Vrms = root mean square voltage.

2. VDC = volts direct current.

Creepage (Y mm)

3. The creepage distances not in parentheses apply when the equipment is installed in a normal office environment. The larger

dimensions, given in parentheses, must be applied when the equipment is installed in an environment in which dust and other

types of pollution could conduct electricity because of the effects of dampness and condensation. This applies to locations

subject to high humidity.

Clearance (X mm)

Up to 50 2.4 (3.8) 2.0

Up to 125 3.0 (4.8) 2.6

Up to 250 5.0 (8.0) 4.0

Up to 300

4. For working voltages exceeding 300V, consult a competent telecommunications engineer prior to installation.

6.4 (10.0) 4.0

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 33 34

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