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Compliance


  • Cabling work carried out shall comply with:
  • UC Network Structured Cabling Specification Standards
  • University of Canterbury Health & Safety standards.
  • Manufacturer’s specifications;
  • NZ Standard installation and electrical tagging codes
  • IEC 1010-1 Over voltage protection CAT (1 - 1V)
  • ACMA technical standards

 

Twisted Pair


UC currently standardise on CAT6A twisted pair cabling (please refer to the UC Network Structured Cabling Specification Standards for more details). No other type of twisted pair cabling shall be used on campus unless authorised by the ICTS Network Team Leader.

The Telecommunications Contractor for the University is the only authorised company to run, install, and terminate twisted pair cabling for dedicated runs back to the UC network patch panel and dedicated local runs between AV devices.

Where possible, all audio visual signals shall be distributed over the same twisted pair structured cabling system in use by IT networks, with the exception of powered audio cabling between amplifiers and speakers and inter-device cabling co-located within the audio visual rack. 
All cabling shall be neat and tidy.

Transmitters/Receivers vs Dedicated AV Cable

Where appropriate and required, all native audio, video and control signals shall be distributed to/from local AV devices via the use of twisted pair transmitters/receivers (signal converters). Only approved twisted pair transceivers (see appendix) shall be used to convert the native audio, video and control signals for twisted pair delivery.

Depending on cable length runs and weighing up overall cost benefits to UC, it may be more appropriate to run dedicated AV cables (eg. HDMI) between a projector and a lectern. Twisted pair cabling should still be run at the same time in conjunction with the dedicated cables to future proof the room as additional cable runs are much cheaper to do at the same time rather than having to do a retro-install.

Approved Cat6A patch leads must be used on HDBaseT connections to ensure a complete Cat6A run from a video matrix switcher to a data projector. All other regular connections that do not rely on HDBaseT can utilise Cat5e patch leads.

Shielded (STP) & Unshielded (UTP)

All local CAT6A cable that will be transmitting AV video signals shall be shielded twisted pair (STP) and terminated properly and according to industry standard. By industry standard, it is best practice to use shielded twisted pair (STP) when using twisted pair cabling for transmitting AV signals across it to avoid any crosstalk and potential power interferences.

The AV Contractors will need to work closely with the Telecommunications Contractor to ensure that STP cables are used and terminated correctly.

Termination / Cable Colour / Labeling

Twisted pair cabling for AV must be identified as such with the approved labeling affixed to the RJ45 wallplate.

Twisted pair cabling for AV must terminate directly onto RJ45 patch-panels in the AV rack patch panel for fixed lectern installations. For mobile lecterns, cables are permitted to terminate at the floor box.

 

 

Fibre Optic


Fibre optic cabling should only be used on cable runs that may jeopardise maximum twisted pair cable lengths, and/or where there will likely be a high risk of power interference near where AV cabling will need to be run.

Consultation and approval from the LTS Team Leader will need to be given in writing for fibre cabling to be run. Consideration into fibre transmitters and receivers will need to also be factored into the AV schematics of the install to ensure a successful AV solution for the teaching space.

 

 

Audio Visual Cables


Cable Use

The following cables are approved for installation at UC:

 

OUTSIDE of a rack, lectern, or cabinet and going between AV devicesINSIDE a rack, lectern, or cabinet

Twisted Pair (UTP & STP)

HDMI

Speaker wire

Twisted Pair (UTP & STP)

HDMI

DVI

VGA (only when connecting to analog AV equipment)

Speaker wire

Audio cable types as necessary

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NB: VGA, analog, or coaxial based cables shall NOT be used for dedicated cable runs outside of any AV rack, lectern, or cabinet. Written approval will need to be given by the LTS Team Leader for any exceptions.

RS-232 System Control Cabling

Provides system control cabling for control of projectors and lighting from the audio visual systems. RS-232 to RJ45 adapter variations must be used to provide flexibility and ease of connectivity.

USB Subsystems

Provide USB 2.0 (or 3.0 when available) cabling for connecting such devices as USB flash drives to the resident PC inside of the lectern (please refer to the appendix for approved USB hubs and solutions).

Front Speaker Cabling

Provide front of house speaker cabling to all front of house speakers. Speaker cabling shall consist of Belden figure 8 min. 16 AWG with bare copper conductors.

Ceiling Speaker Cabling

Provide 100 volt line cabling to all ceiling speaker outlet locations. Supply and install speaker cabling to all speaker outlet locations. Speaker cabling shall be high quality double insulated OLEX JSF 2.6 or similar with a 1mm thickness.

Ceiling speakers shall be cabled in rows off a main speaker wire line back to the lectern.

The ceiling end of the cable shall be left terminated and coiled within the ceiling void with the location clearly identified on the as-build drawings allowing future relocation to the first ceiling speaker position.

For ceilings with no service access, a service loop for each speaker in ceiling must be provided for maintenance/repair. This should allow for the speaker to be lowered to ground level for servicing.

Microphone Cabling

Supply and install microphone cabling to all microphone connection locations. Microphone cabling shall be Belden 8723 or equivalent.

Line Level Cabling

Supply and install line level cabling to all audio input connection locations. Line level cabling shall be Belden 8723.

HDMI

Direct device-to-device HDMI cables may be used subject to the following mandatory requirements:

  • Maximum end-to-end length 20m
  • No joins
  • Category 2 “High Speed” compliant cable (i.e. certified to 340 MHz and 10.2 Gbit/s)
  • Type A (19 pin) connectors
  • Where wall-plates are employed overall end-to-end length must still fit within the 20m limit (15m + 5m fly-leads) and maintain “High Speed” performance

Otherwise, digital video HDbaseT over TP shall be used.

HDBaseT 

HDBaseT shall always use Cat6A or better twisted pair and shall follow manufacturers’ recommendations regarding use of STP or UTP.

The following white paper shall be referred and adhered to whenever HDBaseT signals will be run via twisted pair. http://www.amx.com/assets/whitepapers/CablingforSuccesswithDXLink.WhitePaper.pdf 

It is the responsibility of the AV Contractor to liaise with the Telecommunications Contractor to ensure that these standards are met.

DVI

DVI cabling shall be DVI-D Dual Link and based on the manufacturer’s specifications of connectivity to a device.

VGA

Provides VGA cabling to all video outlet and equipment locations.

VGA cables shall typically be Extron VGA or MVGA 15-pin cables capable of passing all ID bits necessary for DDC2 – Display Data Channel Communications.

There shall be NO custom terminating of VGA cabling.

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NB: VGA solutions in general are no longer supported in new installs and teaching spaces.

 

 

Electrical & Power


Electrical power and cabling all come under UC Facilities Management. Unless agreed to in writing, or in specific project contracts, no one other than approved UC electricians are authorised to modify or add to any power related cabling, circuitry, or equipment on the UC campus.

Electrical Safety Testing

All equipment must be electrically safety tested and tagged prior to handover. It is the responsibility of the AV contractor to organize and arrange for this to happen prior to sign off.

AC Power

The AV Contractor shall connect all AV devices to the dedicated power feed designated to the lectern and projector.

A 19” AC power rack rail shall be provided in the lectern to connect all AV equipment to.

AC power wiring shall be run separately from signal cable.

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NB: AUDIO VISUAL CABLING MUST BE SEGREGATED FROM POWER CIRCUIT CABLING.

Power Boards

Only approved industry-grade power racks (1RU) are to be used to ensure proper power termination between a power socket from a floor box or wall into the lectern (see appendix). No power double adapters or domestic-grade power boards are to be used as part of any installation or upgrade.

Grounding

Equipment grounding shall include all cable and installation hardware. All audio visual equipment shall be connected to earth ground via internal building wiring, according to NZ Electrical Regulation Codes.

All audio visual designated circuits within an installation shall all be derived from the same load centre and maintain the same neutral and earth relationship throughout the installation.

The AV Contractor shall ground all contractor installed equipment to eliminate all shock hazard and to minimize, to the maximum extent possible, all ground loops, common mode returns, noise pickup, cross-talk, etc.

System

The AV Contractor shall ground all OFE to earth ground, via an approved electrical ground with wires run inside of the building, to eliminate all shock hazards. The number of ground connections shall be kept to a minimum. In all cases, total ground resistance shall be 0.1 Ohm or less.

The use of conduit, signal duct, or cable trays as system or electrical ground is not acceptable.

Under no conditions shall the AC neutral, either in a power panel or in a receptacle outlet, be used for system control, sub-carrier or audio reference ground.

Cabinet Bus

A common ground bus of at least #10 AWG solid copper wire shall extend throughout each equipment cabinet and be connected to the system ground. 


Equipment

Self grounding equipment enclosures, racks or cabinets, that provide original equipment manufacturer certified functional ground connections through physical contact with installed equipment, are acceptable otherwise equipment shall be bonded to the cabinet ground bus with copper wire or braid equivalent to at least #14 AWG.

 

 

Cable Management


Cable Segregation

The minimum segregation requirements from power cables in accordance with AS2834 shall be observed for all audio visual cabling including earthing cabling.

 

Segregation of Services

Circuit Rating kVA @ < 415V AC

Unshielded Power Cables

Shielded Power Cables

£ 1

300 mm

25 mm *

³ 1 £ 2

450 mm

50 mm

³ 2 £ 5

600 mm

150 mm

> 5

1500 mm

300 mm

* Interposing insulating barrier or earthed, continuous metal barrier required.

 

The audio visual contractor shall co-ordinate his works with and the works of other trades to ensure segregation requirements are maintained throughout the audio visual cabling installation.

Cable Access

The method of support for cable runs shall be through the use of:

  • Catenary wire support
  • Conduit or duct system
  • Cable trays

Cable Length Limits

Maximum cable lengths differ depending on technology and shall not exceed the maximum cable length standards at UC. All copper cabling must remain within the one earthing zone of the one building. No exceptions. Only optical fibre may be run between buildings or (where a physical building is comprised of multiple electrically independent ‘buildings’) between power system earthing zones.

Each transmission technology has defined maximum lengths, beyond which transceivers must be used, or equipment must be constrained to lie within.

 

Maximum Cable Lengths

Cable Type

Maximum Length

HDBaseT over CAT6A or better

100m end to end including allowance for all fly-leads and patch-leads

HDMI

20m end to end including allowance for all fly-leads and patch-leads. Regardless of length, it must meet or exceed HDMI “High Speed” (Category 2) Standard i.e. certified to 340 MHz and 10.2 Gbit/s end to end

VGA

Refer to cable manufacturer’s specifications

Analog AV over CAT6A TP

Refer to cable manufacturer’s specifications

10/100/1000 Mbit/s Ethernet over CAT5e or better

100m end to end including allowance for all fly-leads and patch-leads

RS-232 over any CAT6A TP

50m end to end including allowance for all fly-leads and patch-leads, or manufacturer’s recommended maximum cable specifications if using active or embedded tx/rx devices

RS-422 over any CAT6A TP

200m end to end including allowance for all fly-leads and patch-leads, or manufacturer’s recommended maximum cable specifications if using active or embedded tx/rx devices

RS-485 over any CAT6A TP

200m end to end including allowance for all fly-leads and patch-leads, or manufacturer’s recommended maximum cable specifications if using active or embedded tx/rx devices

Line level audio – balanced (STP)

<1 dB attenuation at 10 kHz end to end with matched (low-Z ~100W) drive; high-Z (>1kW) termination.

Line level audio – unbalanced (coax)

<1 dB attenuation at 10 kHz end to end with matched (low-Z ~100W) drive; high-Z (>1kW) termination.

Figure 8 speaker wire

Round-trip impedance <10% of speaker impedance. Both resistive impedance (measured at DC) and inductive impedance measured at 1kHz, e.g. if speaker resistance is 8W over 0Hz to 1kHz then cable AWG must deliver less than 0.8W round-trip impedance, i.e. single conductor end-to-end 0.4W

 

Cable Joins & Bends

Cable joiners must NOT be used in any cable. Any exception to this must be signed off by the LTS Team Leader.

Wherever a change of direction occurs in cable/conduit runs, cables and conduits shall be curved with a minimum inner radius of bend as prescribed in the manufacturer’s specification or 8 times the cable diameter, whichever greater.

Where cables of different sizes run together the minimum radius of bend for all cables should be that applicable to the largest cable in the group.

Cables not installed within conduits should be anchored immediately before the start and after the finish of the bend.

Tray Support Systems

Tray systems and supports where used shall comply with the following requirements:

  • Trays carrying audio visual cabling shall maintain segregation from other services;
  • Trays shall have a minimum clearance or stand off from walls of 25 mm to allow suitable cable fasteners to be used;
  • Trays shall provide a minimum vertical open working space of 150 mm;
  • Changes in tray direction shall be made using commercially pre-made standard formed bends compatible with the main tray;
  • Bolts or sharp objects shall not protrude through the cable bearing surface;

All external cabling is to be covered using white tubular braided sleeving. Joints in the tray shall be butted and present a smooth finish to the cable bearing surface.

Floor Boxes

Floor boxes are to be used underneath where any lectern will be housed. This removes any potential tripping hazards of cables, and provides a clean solution for the room with or without a lectern present. For teaching spaces that have two projector installs, two floor boxes may need to be used side by side to ensure there is adequate space for AV and power cabling to each of them.

The floor boxes are to be a minimum 300 mm x 300 mm sized and deep enough to be able to house all the services required for the desk. Two empty 32 mm conduits as a minimum with draw wires should be provided to a floor box to enable future expansion. All floor ducts are to have removable lids.

There are to be no twisted pair extenders or receivers installed into any floor boxes. Extenders should always be located in the lectern or rack cabinet. Written approval needs to be given from the LTS Team Leader for any exemptions.

Wall & Cupboard Plates

All audio visual cabling shall terminate on suitable connectors and plates (excluding where noted), both in the field and at the equipment side. The connectors shall be mounted on suitable plates and labeled to identify the function of all terminations.

Plates to be mounted in the field or in floor boxes shall match power and communications plates.

Fly-Leads on Lectern / Wall

Fly leads to connect in laptops and mobile devices will be provided in each lectern with the ability of retracting back to avoid any unnecessary cable clutter.

Small AV Components

Transceivers, amplifiers, power-supply units and other electronics shall NOT be installed in inaccessible locations and are not to be installed:

  • In or behind floor-boxes
  • Within walls (e.g. behind wall-plates)
  • In ceilings

Written approval is required by the LTS Team Leader on any exceptions.

Securing, Mounting, & Supporting

The following methods shall be used when securing, mounting, and supporting any type of AV cable within a teaching space:

  • A velcro-based cable tie solution is the approved method at UC for securing and tying AV cables together. Care must be given to ensure that cables are neat and tidy and professionally bundled together inside a rack, lectern, or cabinet, as well as other items that expose cabling to or from an AV device in the teaching space.
  • Audio visual cabling should be supported on cable tray or catenaries in ceiling spaces. Cables support ties should be attached to catenaries at 200mm intervals ensuring Velcro ties are firm but do not distort or apply undue pressure to the cables in any way.
  • Catenary wires shall be galvanised steel of 2.5 mm diameter minimum, securely fixed to the building structure at each end and supported at intermediate points as required. Catenary wires shall support cables clear of all structures, services and other equipment. Provide turnbuckles of suitable size to permit future adjustment.
  • A service loop is required for audio visual cabling within the rack, projector and speakers (this will allow for future re-termination). A gentle drip loop is required at each termination for strain relief of the cable, between the termination point and where secured to the threaded rod in the rack.
  • All cables shall be provided with strain-relief slack and tether solution. Slack shall be sufficient to allow equipment disconnection without dismantling the tether.
  • Cables shall NOT be embedded directly in concrete or plaster.
  • For large cable bundles that need to be secured together, WHITE techflex cable sleeve shall be used to provide a neat and tidy solution eg. Cable bundle between project and ceiling tile.
  • Cable ‘mouse’ grommets in ceiling tiles and lectern desk are permitted. The use of similar coloured grommets to the surface where they will be installed shall be used.
  • Zip-up or twisted based plastic cable ties shall NOT be used to tie up any cable bundles.
  • Any AV device that requires securing, mounting, or supporting should use a manufacturer’s supplied rack-mount, rack-mount kit, rack-mount tray, surface-mount kit, under-table mount kit, or custom 3rd party mount kit.
  • Self-adhesive Velcro should only be used as a way of securing, mounting, or supporting if all of these other options above are not available.

All fixings, fastenings and supports shall be of adequate strength and arranged to ensure the installation against mechanical failure under normal conditions of use and wear and tear.

Cable bundles shall not obstruct installation and removal of equipment in equipment racks.

Apart from twisted pair cables, all other cabling, including inter-device cables, shall comply with the requirements outlined above.

Cable Protection

Where cables are liable to environmental damage, they shall be protected in a suitable manner.

Where building features make it necessary to run cable through block walls or concrete slabs and the like, any such cable shall be protected within PVC conduit.

All cables shall be protected where they pass through any openings, gaps, holes etc., by ensuring that surrounding surfaces are smooth and free of sharp edges etc., and that holes are bushed where necessary with close fitting plastic bushes.

 

 

Cable Provisioning


The table below indicates data and power cabling requirements for all audio visual components.

 

Device / Cabling Requirements

Data Outlets

Power Outlets (SSO)

Notes

Projector

2

2

1 x Video Decoder & Control

1 x LAN / Spare

Flat Panel Screen

3

2

1 x Video Decoder & Control

2 x LAN / Spare for future enhancements (ie. wireless casting, pc, digital signage etc)

Video Encoders
- Resident PC
- HDMI/VGA Input
- Document Camera
- Wireless Caster
- PTZ Camera 

5

1

 

Ceiling Microphones

1

0

Scale according to # of ceiling mics in space

Audio DSP

1

1

 

Touch Panel1 PoE

Wireless Microphone Receiver

1

1

 

Motorised Projection Screen

1

1

 

Video Camera

1

1 (if non-PoE)

Recommended on dedicated data outlet

Lectern Rack / AV Rack

1

1

For general network access and control (usually an 8 port switch)
- Resident PC
- Document Camera
- Wireless caster
- Controller
- Other misc 

 

 

Decommissioned Cables


All redundant or disused cabling and wall plates must be completely removed upon any upgrade to a teaching space, unless such cable is correctly installed and terminated at both ends in a manner that complies with this Standard and will still be of use.

 

 

 

 

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