Date post: | 07-Jul-2018 |
Category: |
Documents |
Upload: | yoesof-hilaby |
View: | 214 times |
Download: | 0 times |
of 43
8/18/2019 Electrical Supply Lect 6
1/43
Unit - 3
BUILDING SERVICES – I
Lecture - 6
8/18/2019 Electrical Supply Lect 6
2/43
• Electricity is supplied through “wires”, comparableto pressured water supply pipes.
• At points along the wires are lighting outlets,switches, and receptacles. Turning on a light switchor plugging equipment into a receptacle is
comparable to opening a faucet/valve.
Electrical Supply
Electrical su
pply
Can be
compared to
Water supply
8/18/2019 Electrical Supply Lect 6
3/43
ltage
Equivalent to water pressure; pump controls waterpressure; generator or battery controls voltage;standard voltage is 120/240; most common lowvoltage is 12V
8/18/2019 Electrical Supply Lect 6
4/43
Amperage
Electrical current; equivalent to low o water !gal/sec"
8/18/2019 Electrical Supply Lect 6
5/43
Resistance# $pposition to low o current; amount o resistance aected by#
• aterial
• !iameter
• "ength
8/18/2019 Electrical Supply Lect 6
6/43
%attage
&nit o power; rate at w'ic' a deviceconverts current to anot'er orm !'eator motor"
!Voltage ( Amperage"
8/18/2019 Electrical Supply Lect 6
7/43
Watt-hour# $nit of energy% measures amount ofenergy/electricity used in one hour
Watts x hours of use=watthours orKWHR, e.g.,
100 w x 24hrs = 2400 whrs/day
= 2.4 KWHRs
2.4 KWHR/day x 0 days/!o.
= "2.4 KWHR/!o
"2.4 KWHR x Rs. #/KWHR = Rs.
$%1/!o
8/18/2019 Electrical Supply Lect 6
8/43
)irect *urrent
)irect current# *urrent lows in onedirection
8/18/2019 Electrical Supply Lect 6
9/43
Alternating *urrent
Alternating current# *urrent lows insingle direction but reverses direction atregular intervals
8/18/2019 Electrical Supply Lect 6
10/43
Electrical )istributionand +ome %iring
E"E&T'(&( T)
*E+E'AT(+
E"E&T'(&(T) T'A+-'TAT(+
E"E&T'(&(T)!(-T'($T(+
8/18/2019 Electrical Supply Lect 6
11/43
&er'i(e(o))e(tio)s
012/3024,56wire
system
8/18/2019 Electrical Supply Lect 6
12/43
!istribution anel/&ircuitrea7er o8
8/18/2019 Electrical Supply Lect 6
13/43
8/18/2019 Electrical Supply Lect 6
14/43
8/18/2019 Electrical Supply Lect 6
15/43
!istribution anel And &ircuits
220-240
*
11%-120*
8/18/2019 Electrical Supply Lect 6
16/43
le(tri(al itti)gs )d pplia)(es
8/18/2019 Electrical Supply Lect 6
17/43
8/18/2019 Electrical Supply Lect 6
18/43
8/18/2019 Electrical Supply Lect 6
19/43
8/18/2019 Electrical Supply Lect 6
20/43
8/18/2019 Electrical Supply Lect 6
21/43
%iring
8/18/2019 Electrical Supply Lect 6
22/43
*onductors
%ire over w'ic' electrons are transmitted
8/18/2019 Electrical Supply Lect 6
23/43
*opper %ire#,elation between )iameters andAmperage and ,esistance
8/18/2019 Electrical Supply Lect 6
24/43
-nsulators
+olds electrical current in proper pat'.
8/18/2019 Electrical Supply Lect 6
25/43
ains
8/18/2019 Electrical Supply Lect 6
26/43
8/18/2019 Electrical Supply Lect 6
27/43
rounding
or electrical saety. it is required t'at every circuit begrounded 'is assures t'at all metal parts o a circuit t'ata person mig't accidentally touc' are maintained at 3erovoltage. because t'ey are connected directly to t'e ground
'e grounding wire is attac'ed to t'e t'ird slot on a wall
receptacle
8/18/2019 Electrical Supply Lect 6
28/43
rounded towater pipe or
ground rod
8/18/2019 Electrical Supply Lect 6
29/43
If hot wire touches cover plate of ungrounded switch or outlet, theplate will be electrically charged. If the body touches the plate, the
body becomes part of the circuit and will receive a shock.
8/18/2019 Electrical Supply Lect 6
30/43
rounding toreduce s'oc
'a3ard
8/18/2019 Electrical Supply Lect 6
31/43
8/18/2019 Electrical Supply Lect 6
32/43
8/18/2019 Electrical Supply Lect 6
33/43
8/18/2019 Electrical Supply Lect 6
34/43
8/18/2019 Electrical Supply Lect 6
35/43
8/18/2019 Electrical Supply Lect 6
36/43
8/18/2019 Electrical Supply Lect 6
37/43
8/18/2019 Electrical Supply Lect 6
38/43
8/18/2019 Electrical Supply Lect 6
39/43
8/18/2019 Electrical Supply Lect 6
40/43
8/18/2019 Electrical Supply Lect 6
41/43
8/18/2019 Electrical Supply Lect 6
42/43
8/18/2019 Electrical Supply Lect 6
43/43