or other spaces used for environmental air.

Exception: As permitted in 830.154(A).

(C) Equipment in Other Space Used for Environmental

Air. Section 300.22(C) shall apply.

(D) Output Circuits. As appropriate for the services provided, the output circuits derived from the network interface unit shall comply with the requirements of the following:

(1) Installations of communications circuits — Article

800

(2) Installations of community antenna television and radio distribution circuits — Article 820

Exception: 830.90(B)(3) shall apply where protection is provided in the output of the NIU.

(3) Installations of optical fiber cables — Article 770

(4) Installations of Class 2 and Class 3 circuits — Article

725

(5) Installations of power-limited fire alarm circuits — Article 760

830.15 Power Limitations. Network-powered broadband communications systems shall be classified

as having low-or medium-power sources as specified in
830.15(1) or (2).
(1) Sources shall be classified as defined in Table
830.15.

(2) Direct-current power sources exceeding 150 volts to ground, but no more than 200 volts to ground, with the current to ground limited to 10 mA dc, that meet the current and power limitation for medium-power

sources in Table 830.15 shall be classified as medium- power sources.
FPN: One way to determine compliance with
830.15(2) is listed information technology equipment
intended to supply power via a telecommunication
network that complies with the requirements for RFT-
V circuits as defined in UL 60950-21, Standard for

Safety for Information Technology Equipment —

Safety — Part 21: Remote Power Feeding.

Table 830.15 Limitations for Network-Powered
Broadband Communications Systems

Network Power Source Low Medium

1

equipment shall be installed in a neat and workmanlike manner. Cables installed exposed on the surface of ceilings and sidewalls shall be supported by the building structure in such a manner that the cable will not be damaged by normal building use. Such cables shall be secured by hardware including straps, staples, cable ties, hangers, or similar fittings designed and installed so as not to damage the cable. The installation shall also conform to 300.4(D) and 300.11.
FPN: Accepted industry practices are described in ANSI/NECA/BICSI 568-2006, Standard for Installing Commercial Building Telecommunications Cabling; ANSI/ TIA/EIA-568-B. 1-2004 — Part 1 General Requirements Commercial Building Telecommunications Cabling Standard; ANS1/TIA-569-B-2004 — Commercial Building Standard for Telecommunications Pathways and Spaces; ANSI/TIA-570-B — Residential Telecommunications Infrastructure; and other ANSI- approved installation standards.

830.25 Abandoned Cables. The accessible portion of abandoned network-powered broadband cables shall be removed. Where cables are identified for future use with a tag, the tag shall be of sufficient durability to withstand the environment involved.

Circuit voltage, V max (volts)

0-100 0-150

Power 250 250 limitation, W4 max(volt-amperes)'

Current limitation, / max iooo/vmax iooo/vmax

(amperes)1

Maximum power rating 100 100 (volt-amperes)

Maximum voltage rating 100 150 (volts)

Maximum overcurrent 100/V max NA

protection (amperes) 2

are determined with the current-limiting impedance in the circuit (not bypassed) as follows:
Vmax—Maximum system voltage regardless of load with rated input applied.
'max—Maximum system current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. / max limits apply