RG59 Cable With Power 200M

RG59 Siamese Cable with Power — 200 Metre Reel

The RG59 Siamese Cable with Power is a dual-purpose coaxial and power cable designed for analogue and HD-over-coax CCTV camera installations. It combines an RG59 coaxial core for video transmission with a parallel 2-core power conductor in a single unified jacket — eliminating the need to run separate video and power cables to each camera location. Furthermore, the 200-metre reel format provides sufficient length for medium to large camera installations without mid-run joins that could introduce signal degradation.

This cable type is the industry-standard choice for analogue CCTV, HD-CVI, HD-TVI, and AHD camera systems where coaxial video transmission is preferred over IP-based structured cabling infrastructure. It is compatible with the full range of BNC-terminated analogue and HD-over-coax cameras and DVR systems.

Video Transmission — RG59 Coaxial Core

The RG59 coaxial core consists of a central conductor surrounded by a dielectric insulator, a braided or foil shield, and an outer jacket. This construction provides 75-ohm impedance — the standard for video transmission applications. The 75-ohm characteristic impedance minimises signal reflection and maintains consistent video signal integrity across the full cable run.

RG59 supports analogue CCTV video transmission at standard definition (CVBS) and is additionally compatible with HD-over-coax formats including HD-CVI, HD-TVI, and AHD at resolutions up to 4K (8MP) on shorter runs. Consequently, an RG59 Siamese installation provides a viable upgrade path from legacy analogue systems to HD-over-coax without recabling — a significant cost advantage over IP-based migration projects.

Maximum recommended video transmission distances vary by format:

• Analogue CVBS — Up to 300 metres
• HD-CVI / HD-TVI / AHD (1080p) — Up to 500 metres (format and DVR dependent)
• HD-CVI / HD-TVI / AHD (4K/8MP) — Up to 150–200 metres (format dependent)

The central conductor is typically 20 AWG copper-clad steel (CCS) or bare copper. Bare copper provides lower resistance and better signal transmission over longer distances, whereas CCS reduces material cost. On runs approaching the maximum transmission distance, bare copper conductor construction is preferable.

Power Core

The integrated power core consists of two 18 AWG conductors — one positive and one negative — running parallel to the coaxial core within the shared outer jacket. This power pair supplies DC voltage directly from a centralised PSU or individual camera power adapters to each camera along the run.

The 18 AWG conductor gauge supports the following DC power delivery across typical camera cable run distances:

• 12V DC cameras — Suitable for runs up to approximately 30–40 metres at typical camera current draws of 300–500mA
• 24V AC cameras — Reduced voltage drop impact allows longer effective power runs

For longer runs or higher-current cameras — such as IR illuminator-equipped models or PTZ units — voltage drop across the power core must be calculated before installation to ensure the camera receives adequate operating voltage at the far end. Cameras receiving below their minimum operating voltage may exhibit image instability, IR cut-filter malfunction, or failure to initialise.

Cable Construction

The RG59 Siamese Cable is constructed as two parallel components bonded within a shared PVC outer jacket:

Coaxial component:

• Centre conductor: 20 AWG (CCS or bare copper)
• Dielectric: Foam polyethylene or solid polyethylene
• Shield: Aluminium foil with 95% braided copper or aluminium coverage
• Impedance: 75 ohms

Power component:

• Conductors: 2 × 18 AWG (CCS or bare copper)
• Insulation: PVC, colour-coded (typically black and white, or red and black)

The siamese jacket bonds both components along their length, allowing the installer to split and separate the coaxial and power sections at each termination point without cutting into either core. This construction simplifies termination at camera heads and PSU connection points.

Installation Characteristics

The 200-metre reel provides sufficient cable for installations of up to approximately 8–12 cameras depending on run lengths, before requiring a second reel. The reel format allows controlled payout during installation through ceiling voids, conduit, and trunking runs.

At each camera end, the coaxial core terminates into a BNC connector — either compression-fit or crimp-type — which connects directly to the camera’s video input. The power core terminates into a DC barrel connector (typically 5.5mm × 2.1mm) at the camera end and connects to the output terminals of a centralised CCTV power supply unit or individual plug-in adapters.

Cable routing should avoid parallel runs with mains AC power cabling where possible. Where crossings are unavoidable, routing at 90 degrees minimises electromagnetic interference pick-up on the coaxial core — a common cause of interference patterns (hum bars or banding) on analogue video feeds.

Supported Applications

The RG59 Siamese Cable with Power supports the following CCTV and security applications:

• Analogue CCTV (CVBS) — Standard definition camera systems up to 300m
• HD-CVI — Hikvision and Dahua HD-over-coax up to 4K/8MP
• HD-TVI — Turbo HD over coax up to 4K/8MP
• AHD — Analogue High Definition over coax
• PTZ Camera Power — 12V DC or 24V AC pan-tilt-zoom camera installations (voltage drop calculation required)
• IR Bullet and Dome Cameras — Fixed analogue and HD-over-coax cameras with integrated IR illumination
• DVR-Based NVS Systems — Direct coaxial connection to 4, 8, 16, and 32-channel DVR units

Ideal Users

• CCTV and Security System Installers — RG59 Siamese is the standard deployment cable for analogue and HD-over-coax camera systems. The combined video and power construction reduces installation time per camera run compared to pulling separate coax and power cables. The 200-metre reel handles the majority of standard commercial and residential camera installation volumes in a single spool.
• Small Business and Retail Security Operators — For sites requiring 4–16 cameras with a centralised DVR, RG59 Siamese cable provides a cost-effective, straightforward infrastructure. HD-over-coax compatibility (HD-CVI, HD-TVI, AHD) means the cabling supports resolution upgrades from legacy analogue to 2MP, 4MP, or 8MP cameras without infrastructure replacement.
• Property Developers and Building Contractors — Pre-wiring new builds and refurbishments with RG59 Siamese during the construction phase provides a ready-to-activate CCTV infrastructure for building owners. The cable supports both current analogue installs and future HD-over-coax upgrades within the same physical cable run.
• Systems Integrators Upgrading Legacy Analogue Infrastructure — Where existing RG59 infrastructure is already in place, the cable’s compatibility with HD-CVI, HD-TVI, and AHD formats allows camera head replacements to deliver HD resolution without recabling — protecting the existing cable investment while delivering a resolution improvement to the end customer.
• Facilities and Estate Management Teams — For campuses, car parks, and multi-building sites where IP networking infrastructure is not available at all camera locations, RG59 Siamese provides a self-contained video and power solution that operates independently of the data network — reducing dependence on IT infrastructure for physical security coverage.

Coaxial Core Specifications

Power Core Specifications

Transmission Distance Reference

Physical Specifications

Installation Parameters