Basic Electrical Installation Work

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Strana 392 z 399

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Resistance any circuit, resistance defined opposition current flow. Plastic plugs plastic plug made hollow plastic tube split half its length to allow for expansion. the regulation to be met ‘so far reasonably practicable’, then risks, cost, time, trouble and difficulty can considered.f. . are both measured volts. Risk risk the ‘likelihood’ harm actually being done. Protective equipotential bonding This equipotential bonding for the purpose safety.d.) defined the cosine the phase angle between the current and voltage. Polyvinylchloride (PVC) PVC used for cable insulation thermoplastic polymer.d. Potential difference The potential difference (p. Power Work done Time taken W ) Pressure stress Pressure stress measure the force per unit area.) the change energy levels measured across the load terminals. Resistivity The resistivity (symbol the Greek letter ‘rho’) material defined as the resistance sample unit length and unit cross-section. Risk assessments Risk assessments need suitable and sufficient, not perfect. Phasor phasor straight line, having definite length and direction, which rep- resents scale the magnitude and direction quantity such cur- rent, voltage impedance. Once the active chemicals are exhausted, the cell must discarded. PVC/SWA cable installations Steel wire armoured PVC insulated cables are now extensively used on industrial installations and often laid cable tray. Power factor Power factor (p. Power Power the rate doing work. Pressure stress Force Area N/m ) 2 Primary cell primary cell cannot recharged. Each size plastic plug colour-coded match a wood screw size. Relay relay electromagnetic switch operated solenoid. Reasonably practicable absolute the requirement the regulation absolute, then that regulation must be met regardless cost any other consideration.Glossary terms 381 Personal protective equipment PPE defined all equipment designed worn, held, protect (PPE) against risk health and safety. This also called the volt drop terminal volt- age, since emf and p. Rubber Rubber tough elastic substance made from the sap tropical plants