Download Data & Power Cable Separation 1204.pdf PDF

TitleData & Power Cable Separation 1204.pdf
TagsCable Electrical Wiring Electrical Components Equipment
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Separation of power and data cables

The separation of power cables from data cables is given in EN 50174-2, Information
technology – Cabling installation – Part 2:Installation and planning practices inside
buildings, and is summarised in Table 1.

Table 1 Cable separation rules from EN 50174-2:2000

Type of installation Separation distance
Without a divider or
with a non-metallic

divider

Aluminium divider Steel divider

Unscreened power
cable and unscreened
IT cable

200-mm 100-mm 50-mm

Unscreened power
cable and screened IT
cable

50-mm 20-mm 5-mm

Screened power cable
and unscreened IT
cable

30-mm 10-mm 2-mm

Screened power cable
and screened IT cable

0-mm 0-mm 0-mm

Note that EN 50174 permits no separation for the final 15 metres of the horizontal
cable run

From Table 1 we can see that the worst case, unscreened power cable next to
unscreened I.T. cable, is 200-mm. The standard makes no distinction between
Category 5 or 6 etc., or what kind of screening is used. It is either a screened or an
unscreened I.T. cable. The table is mostly self-explanatory but some extra clarification
is required.

The metallic dividers are presumed to be earthed.
The I.T. cables are balanced and working with a balanced transmission circuit.
The power cables are standard 50 to 60 Hz operation with no unusual transients or
high frequency or high voltage components.
I.T. cables are expected to be at least 130 mm from any kind of fluorescent lamps.
Other separation distances may be required by other or national safety standards.
Readers should consult national standards or IEC 61140 Protection against electric
shock and IEC 60364 Electrical installation of buildings. Wherever there is a conflict

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