What is the critical power path in an IT environment?

The critical power path in a server room, datacentre or other type of network environment is the path from the building incomer (mains power supply) to the critical load connection socket or terminal (PDU). Elements within the critical power path can include LV switchboards, UPS systems and standby power generators, transformers, sub-distribution panels, power distribution […]

What is the Energy Performance Directive?

The Energy Performance of Buildings Directive(EPBD) is the EU’s (European Union) main legislative instrument which aims to promote the improvement of the energy performance of buildings within the EC.  The Energy Performance of Buildings Directive is designed to help reduce carbon emissions from buildings. One of its articles states all air conditioning systems over 12kW should be inspected regularly (at least every five years). These inspections will highlight […]

What Is Power Factor?

Power factor is the ratio of Real Power (W) to Apparent Power (VA) in an AC circuit. Power Factor corresponds to the phase-angle difference between the load drawn voltage and current waveforms. Power factor is shown as a decimal number or percentage i.e. 0.65pF = 65% between 0-1pF and 0-100% respectively. Power Factor formulae include: […]

What is Real Power?

In electrical usage terms, Watts is the unit of measure for the Real Power (also referred to as Active Power) dissipated or drawn by a connected load. Some Unity power factor rated uninterruptible power supplies use Real Power for their rating. Real Power (W) = Supply Voltage (V) x Amps (A) For three phase loads, […]

What Is Apparent Power?

Power protection devices like UPS systems are typically referred to in terms of VA, kVA or even MVA. This measurement refers to the Apparent Power drawn by a load and is calculated as follows: Apparent Power (VA) = Supply Voltage (V) x Amps (A) In the formula (V) is the Root Mean Square (RMS) of […]

How to calculate UPS battery recharge times

Most UPS systems are designed to recharge their batteries to 80% within a 24 hour period. This is achieved through the UPS having an internal charging system. External battery packs may also be fitted with their own individual AC powered battery charger. From 80% the batteries are trickled charged as the typical charging curve is […]

How Will Edge Computing Affect UPS Power Protection?

Edge computing pushes data processing nearest to the device that needs the information to operate, rather than pushing the data back to a centralised datacentre. Edge computing is essentially a de-centralised approach. In terms of power protection to ensure resilience in an entire decentralised eco-system it is important to protect both the servers within the […]

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