Technical informational / commercial investigation
Electric Strike Fail-Secure Wiring Diagram
Wiring and cabling guide
Confirm the exact equipment models, cable types, power capacity, distances and current manufacturer instructions before installation. Terminal names and ratings vary between products.
Main diagram
Equipment list
- Entry Reader - Credential input
- Single-Door Controller - Access decision
- Electric Strike - Fail mode to door design
- Lock Power Supply - Sized to lock and voltage drop
- Request to Exit - Safe-side exit input
- Door Position Contact - Door status
Cable schedule
Use the diagram reference to follow the same connection from the main diagram into the detailed explanation below.
| Diagram ref | From | To | Cable type | Core count | Power or data | Maximum distance | Purpose / important notes |
|---|---|---|---|---|---|---|---|
| C1 | Entry Reader | Single-Door Controller | Reader data cable | Confirm from the exact device functions | Data/control | Not stated | Reader data |
| C2 | Single-Door Controller | Electric Strike | Lock control cable | Confirm from the exact device functions | Data/control | Not stated | Lock control |
| C3 | Lock Power Supply | Electric Strike | Cable sized to load | Confirm from the exact device functions | Data/control | Not stated | Lock power |
| C4 | Request to Exit | Single-Door Controller | Low-voltage input cable | Confirm from the exact device functions | Data/control | Not stated | Exit request |
| C5 | Door Position Contact | Single-Door Controller | Security cable | Confirm from the exact device functions | Data/control | Not stated | Door status |
No maximum distance is invented. Where the exact figure depends on Ethernet design, voltage drop, current draw or the selected device, the schedule tells the installer to confirm it.
What the wiring actually is
Match each C reference to the same label on the main diagram and cable schedule. The line name alone is not a complete cable specification, so this table explains the physical cable, conductor or pair use, what it carries and how it normally terminates.
| Diagram ref | Cable shown | Physical path | Cable construction | Conductors or pairs | What it carries | Normal termination | Confirm before installation |
|---|---|---|---|---|---|---|---|
| C1 | Reader data cable | Entry Reader to Single-Door Controller | Reader cable selected for the protocol: commonly 6-8 core shielded security cable for Wiegand, or a 120-ohm twisted RS-485 pair plus power pair for OSDP. | Wiegand normally uses power, 0 V, D0 and D1 plus optional LED/buzzer/tamper. OSDP normally uses A/B as one twisted pair plus reader power. | Credential data and reader power; OSDP and Wiegand are different interfaces and are not paralleled. | Dedicated controller reader port using only the exact model's labelled terminals. | Protocol, shield treatment, topology, termination, reader current, voltage drop and supported distance. |
| C2 | Lock control cable | Single-Door Controller to Electric Strike | Normally a dedicated two-core low-voltage control pair for a dry contact; use additional cores where power, supervision or status feedback is required. | A relay uses COM with NO or NC as selected by the required normal/fail state. The relay contact must not be mistaken for a power source. | A command, status or release state. Lock/gate operating power normally comes from a separate correctly sized supply path. | Exact relay and receiving input terminals from both current manuals; fire/egress interfaces require the approved project design. | NO/NC logic, voltage/current rating, wet versus dry input, supervision, required fail state and fire/egress compliance. |
| C3 | Cable sized to load | Lock Power Supply to Electric Strike | Dedicated stranded copper power cable sized for supply voltage, continuous/inrush current and voltage drop; commonly two-core for DC positive and negative. | Two conductors for DC power unless the manufacturer specifies a proprietary loom or additional monitoring cores. | ELV DC power or the named protected supply. Never infer voltage from cable colour. | Correctly fused PSU/device terminals with observed polarity; manufacturer battery leads remain unmodified. | Required voltage, polarity, load/inrush current, fuse, cable size, voltage drop, battery capacity and separation from 230-240 VAC. |
| C4 | Low-voltage input cable | Request to Exit to Single-Door Controller | Normally a dedicated two-core low-voltage control pair for a dry contact; use additional cores where power, supervision or status feedback is required. | A relay uses COM with NO or NC as selected by the required normal/fail state. The relay contact must not be mistaken for a power source. | A command, status or release state. Lock/gate operating power normally comes from a separate correctly sized supply path. | Exact relay and receiving input terminals from both current manuals; fire/egress interfaces require the approved project design. | NO/NC logic, voltage/current rating, wet versus dry input, supervision, required fail state and fire/egress compliance. |
| C5 | Security cable | Door Position Contact to Single-Door Controller | Stranded security/alarm cable. Four-core is common for a powered detector or many keypad buses; use six/eight core where extra circuits or spares are required. | Powered devices normally need positive and negative supply conductors plus a zone/relay pair or manufacturer bus conductors. | Low-voltage power and zone, tamper or proprietary bus data as defined by the panel/device. | Panel zone/bus and device terminals; end-of-line resistors belong at the supervised end only when the exact panel requires them. | Exact conductor functions, EOL value/configuration, cable gauge, bus topology, current draw, voltage drop and maximum bus length. |
What "security cable" means
Security cable is a trade description, not a complete specification. On these pages it means multicore, stranded, full-copper extra-low-voltage alarm/access cable. A common Australian product is described as 14/0.20, approximately 0.44 mm2 per conductor, or nominal 0.5 mm2. The installer must still specify core count, conductor area, copper construction, twist/shield requirement, jacket/environment rating and permitted route. It is not Cat5e/Cat6, mains cable, fire-rated cable or automatically suitable for lock power.
| Cable description | Typical use | Important limitation |
|---|---|---|
| 2-core stranded copper | A simple unpowered contact, dry-contact trigger or separately designed DC power pair | Not enough for a powered PIR that also needs an alarm-contact pair. For lock power, calculate conductor size from voltage, current, inrush and distance. |
| 4-core stranded copper | Common for one powered PIR: positive and negative supply plus two alarm-loop conductors; also used for some proprietary four-wire keypad/module buses | Four cores do not define the function or resistor. Label both ends and follow the panel/device manual. |
| 6-core or 8-core stranded copper | Powered devices needing alarm, tamper, auxiliary functions or useful spare conductors | Do not join spare conductors to increase current capacity unless the equipment/cable design explicitly allows it. |
| Twisted or shielded security/bus cable | RS-485/OSDP and other buses only where the manufacturer specifies impedance, twist and shield treatment | Ordinary alarm cable is not automatically a compliant RS-485, OSDP or Ethernet cable. |
| Heavier two-core lock/power cable | Electric strikes, maglocks, sirens or other higher-current ELV loads | Common 0.5 mm2 alarm cable may be too small. Select 1.0 mm2, 1.5 mm2 or another size only after a voltage-drop and inrush calculation. |
Core colours are identification aids only; they do not create a universal positive, negative, zone, tamper or data standard.
Are any resistors required?
| Circuit | Resistor required? | Where it belongs | How to select it |
|---|---|---|---|
| Door contact or REX input | Only if the selected controller supports and is programmed for supervised inputs | At the field contact/device | Use the controller's exact resistor value and arrangement. Many basic access inputs are ordinary unsupervised dry contacts and use no resistor. |
| Wiegand, OSDP/RS-485, Ethernet and reader power | No EOL zone resistor | Not applicable | RS-485 termination, where required, is a bus-termination issue and must not be confused with alarm EOL supervision. |
| Strike, maglock or relay coil | Not an EOL resistor | Suppression is fitted at the inductive load when required | A flyback diode for DC or an approved MOV/RC suppressor may be required by the lock/controller manufacturer. Polarity and device type matter. |
Never choose a resistor by cable colour or by the phrase "security cable". First identify the exact input, panel model and programmed supervision mode. An EOL resistor belongs at the end of the supervised circuit; placing it across the panel terminals defeats cable supervision.
Power requirements
Confirm the selected equipment's supply method, PoE class or DC input, total load and backup requirements before ordering. Keep lock power separate from data-path assumptions, calculate voltage drop for low-voltage loads, observe battery polarity and isolate any 230-240 VAC work to an appropriately licensed electrician.
How the wiring path works
Read the physical cable path first, then power, relay or I/O paths, network addressing and finally app or cloud registration. A device that appears offline may have a physical link, power, addressing or configuration fault; Wi-Fi and cloud registration should not be used to hide an incorrect LAN design.
Practical installation sequence
- Confirm every exact device model and current manual.
- Confirm cable types, routes, separation and distances.
- Check PoE or DC power capacity and site voltage drop.
- Mount and cable devices with power isolated.
- Test continuity, polarity and earth/surge arrangements where applicable.
- Power one subsystem at a time.
- Activate and address network devices.
- Configure relay, call or recording behaviour only after the physical path works.
- Test local operation, remote operation and failure modes separately.
- Record final models, IP addresses, cable IDs, settings and diagram revision.
Common mistakes
- Assuming a port provides PoE without checking the port and total switch budget.
- Confusing a recorder's isolated camera ports with its main LAN uplink.
- Powering a lock from an unsuitable relay or supply.
- Guessing normally-open, normally-closed, polarity or resistor details.
- Ignoring voltage drop, surge exposure or power-failure behaviour.
- Treating app setup as proof that the physical cabling is correct.
Troubleshooting
| Symptom | Likely cause | Test | Corrective action |
|---|---|---|---|
| Device has no power | Incorrect supply method or exhausted PoE budget | Check port status and measure only with the correct procedure | Match the power source to the exact device manual |
| Device powers but is offline | Wrong LAN path, addressing or activation state | Confirm link lights, subnet, gateway and device state | Correct physical LAN and addressing before cloud setup |
| System works locally but not remotely | Internet, DNS, account or cloud registration issue | Prove local operation first, then test WAN services | Correct router or account configuration; do not recable a working local link |
| Relay or lock action fails | Wrong contact logic, power path or load assumption | Test relay and lock supply as separate subsystems | Use the exact manual and suitable lock PSU; confirm egress requirements |
Compatible products and categories
Exact product links above were confirmed on the current Security Wholesalers site on 2026-07-19. Category links are used when an exact active compatible product was not confirmed.
Related diagrams
Frequently asked questions
Can I buy cable using this guide?
Use the cable schedule and buying list to shortlist the cable, then confirm the exact equipment model, route, distance, environment and manufacturer requirements before ordering.
Can cable distance or power capacity be assumed from this drawing?
No. Confirm the selected devices, PoE budget, voltage drop, cable construction and current manufacturer instructions.
Where do terminal names and resistor values come from?
They must come from the exact current manual for the selected model. Do not transfer terminal names, polarity or resistor values from a similar product.
Can this replace the manufacturer manual?
No. It is a planning and support reference only and does not replace manufacturer instructions, licensed work, fire engineering, egress assessment or site commissioning.
Technical references
| Manufacturer | Document | Revision | Relevant pages | Reference | Accessed |
|---|---|---|---|---|---|
| Selected equipment manufacturers | Exact current installation manuals required before terminal-level publication | To be recorded during technical review | Terminal pages not used in this layout | Exact manual to be recorded | 2026-07-19 |
Diagram revision: 0.9. Confirm the exact current manual for the selected equipment before installation.
Australian installation and safety notice
General guide only. Confirm current manufacturer instructions and site requirements. Work involving 230-240 VAC must be completed by an appropriately licensed electrician. Fire-release interfaces, emergency exits and door locking require project-specific compliance assessment. Keep mains and ELV cabling appropriately separated, isolate power before work, observe battery polarity and calculate voltage drop for the real load and cable run.