# Hotel Electrical Installation

Q.1 Circuit diagram of Electric Vehicle Charging system in TT syste

Question 2

a. Luminaire Selection for all Parts of the pool/café section

Q.2e. Circuit Diagram For pool/café Block

Q 2h.

Question 3. Selected Circuit Protective Devices

12 way 125A TPN distribution board complete with 125A TP integral insolator and lookable cover- cart no. PDA9EDB12F125

MCB- mannufacturer schneider electric

SPD- Surge protective – to protect appliance from voltage spikes by shorting or blocking any unwanted voltage. For the design, the surge protection will be located on of the to sensitive devices (for all TV, laptop and phone charging points)

RCD- Residual current device;- disconnects a circuit when elctric current is not balanced, caused mainly by leakage

RCD- rated 4-8mA will be used to protect both people and equipment – for a hotel setting, and breaking time 25-30 ms

Q.4: Table 2: Circuit 1-11

Table 2: Circuit 12

Determine, for one of the circuits supplying the fridges, the minimum possible cross sectional area of cpc which will satisfy the requirements disconnection as ADS under earth fault conditions and the adiabatic equation as Regulation 543.1.3 in BS 7671.

s= i2tk

Where:

k- Factor taken into considerations for resistivity, temperature coeffienent, heat capacity

t- Protective device operating time, for example should be ≤ 5 sec i- Value of amperes (rms ac) of fault current for fault of negligible impedance

Value of k for copper at 70oC, thermoplastic is 143, Given T= 5 sec; i= 3.7 kA Therefore: s= 3.72*5143 S= 57.85 mm2

The crosssectional area of the conductor should be atleast 60 mm2

Question 6

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The shaver unit is electrically separated completely from others so that there is no complete circuit through which shock current can flow. This circuit is small with high earth impedance to ensure fault currents do not flow. In the event of a fault as shown above, the link to the earth is broken by the use of a double wound transformer thus ensuring no path to earth for shock current.

Question 8

Question 9

Question 10

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