A primary concern when installing lengths of wire is voltage drop. The amount of voltage lost between the originating power supply and the device being powered can be significant. Improper selection of wire gauge can lead to an unacceptable voltage drop at load end.

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Figuring out the size of a battery necessary to support the load discharge current for a specific amount of time can be tricky.

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The PTC, or Positive Temperature Coefficient Resistor, acts as a type of circuit breaker. In general, the resistance increases dramatically as the PTC threshold temperature is exceeded due to the load current passing through it. This presents a high resistance, which in effect opens a circuit, protecting the device in question in the event of an over current condition. This is a misunderstood and widely misused component, and this application note should help clarify the most appropriate applications for the PTC.

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When installing any new fire, security, CCTV or access control system, one of the first and most important considerations is power demand. Knowing this allows efficient and cost-effective matching of power supply to the system requirements. The same is true when a new device is added to an existing system.

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There is a growing need to understand and quantify the amount of heat generated by power supplies. This application note explains how to convert power in terms of Watts or HVAC, which is the terminology used in the Power Supply industry into BTU/H which is used by the Heating and AC industry.

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