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Electrical Safety Assessment: Questions & Solutions
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Electrical Safety Assessment: Questions & Solutions
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Electrical Safety Assessment: Questions & SolutionsA consumer unit or distribution board is used to: Right Ans - Provide
distribution and overload protection for final circuits
A main protective bonding conductor is used to: Right Ans - Connect
extraneous conductive parts (such as metal water pipes) to the main earthing
terminal of the installation
A miniature circuit breaker (MCB) is used to: Right Ans - Provide overload
and short circuit protection for electrical circuits
A Permit to Work procedure is a formal written system used to control the
work by means of potential hazards identification and: Right Ans - A risk
assessment
A permit-to-work system must be used: Right Ans - For all work on live
electrical systems
A residual current device is designed to operate in the event of one of the
following: Right Ans - Earth fault
A rewireable fuse will carry an overload current of 50% more than the fuse
rating for approximately Right Ans - 3-4 hours
A risk assessment should be reviewed Right Ans - When any change to the
task or environment takes place
A risk assessment should include consideration of what in your business
might cause harm and how and, the people who might be affected. This should
include: Right Ans - All people who might be affected
A safe system of work is a formal procedure which results from systematic
examination of a task in order to identify all the hazards. It defines safe
methods to ensure: Right Ans - "that hazards are eliminated, or risks
minimized"
A socket in an enclosure to IP 66 can be used for Right Ans - An outside
installation
, A standard (BS1363 or IEC60309) switched socket outlet is used to: Right
Ans - To easily plug a piece of equipment into the electrical supply
A switched fused connection unit is used to: Right Ans - Wire directly into
the final circuit to feed a piece of equipment
A test simulating a fault condition would be used when testing? Right Ans -
Residual current devices
An IEC60309 industrial connector is used in preference to a BS1363 square
pin connector when: Right Ans - For higher-current or 3-phase
applications
Compared with low-current equipment, a piece of equipment that draws a
large-current needs: Right Ans - A larger cable
Earth fault loop impedance should be Right Ans - As low as possible
Extraneous-conductive-parts require protective equipotential bonding to
ensure that? Right Ans - No dangerous potential difference can occur
Fuses are preferable to Miniature Circuit Breakers (MCBs) when: Right Ans
- Very high prospective fault currents may occur
How do you calculate the current drawn by a single-phase mains-powered
device given its power rating Right Ans - Divide the power rating by 230V
If a fuse blows again after being replaced the correct procedure is Right
Ans - Isolate the circuit or device, then trace and rectify the fault
If the hazards of a task can not be eliminated then the next best control is:
Right Ans - A safe system of work
If you are asked to install a piece of electrical equipment that you have never
seen before you should: Right Ans - Do not install it and hand the work
over to someone who has the correct knowledge or experience.
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