Configurations

FENCING CONFIGURATION OPTIONS

1. SHORT-CIRCUIT
   a. TWO adjacent strands touching each other.
   b. Any strand making contact with conventional fencing, supporting posts, gates etc.
2. BREAK
   a. Cutting of one or more strands
   b. Loose or bad connections

Therefore, an ELECTRIC SECURITY ALARM FENCE must be constructed in such a way that the ‘Shorting’ or ‘Breaking’ (cutting) probability is as great as possible. It is therefore imperative that the system is configured correctly to ensure detection of these two conditions. One prime requirement is that strands that is expected to set off an alarm by means of a short circuit should always be installed vertically or straight-up – simply to ensure one is pressed down onto the next if something is placed on them (horizontal or angled strands cannot be expected to come together to cause a short circuit)

VESTRONIC BI-POLAR SYSTEM – MINIMUM FOUR STRAND APPLICATION

• All strands live and monitoredFull Voltage Potential Between StrandsTwo monitored loops
• No DEAD Earth strands
• Full short circuit detection capability between strands
• Full cutting detection on all strands

VESTRONIC BI-POLAR SYSTEM – TYPICAL FIVE STRAND APPLICATION

• Principally, to maintain full monitoring of all strands, multiples of four should be used.As shown, the additional strand is still fully electrified (but not monitored for breaks).Maintains Two Complete LIVE and monitored circuits.
• No DEAD Earth strands
• Full short circuit detection capability between strands
• Full cutting detection on all strands, except for the 3rd strand.

PREFERRED VESTRONIC – BI-POLAR MINIMUM SPECIFICATION

• Minimum six strand 600mm fence recommendation.
•  Advantages as detailed above

CONVENTIONAL UNI-POLAR TYPE SYSTEM

• Based on the single output (agricultural) energiser technology
• Only ONE loop (two strands top & bottom) is monitored for cutting.
• TWO of the five strands are DEAD earth strands – imperative for short-circuit detection between all strands.
• Three of the strands will not detect cutting
• Easily bridged or bypassed – (one jumper)
• Cannot step fence because earth strand will at times end up on top

Alternate Popular Five Strand Configuration

• NO short-circuit detection between the top three strands
• Short-circuit detection only between bottom three strands
• Shock capability on top three strands totally depends on how well the intruder is making contact with ground (earth)
• Low probability
• Full monitoring of four strands for cutting