15A CB
20A CB
30A CB
MAIN
60A CB
GROUND BUS BAR
30A CB
MDP
20A CB
L.O. NM 14/2 or
2.0mm² THHN
C.O. NM 12/2 or
3.5mm² THHN
NM 12/2 or
3.5mm² THHN
M
Single-Phase 3-wire
Line-to-Line
RESIDENTIAL WIRING
Schematic Diagram Beginner's Guide v1.2
AFCI protection is required for all
15 and 20 amp branch circuits
providing power to outlets
LINE LOAD
First AFCI receptacle
protects the branch
circuit
#4 AWG
Surge
Suppressor
S.P.O. NM 10/2 or
5.5mm² THHN
GROUNDING OPTIONS
(all available grounding must
be bonded together)
* Rod and pipe electrode
* Concrete-encased electrode
* Metal underground water pipe
* Ground ring
* Building structure metal frame
Points to Consider (Recommended)
* Use of bolt-on type CBs or DIN-rail
* Use of grounded and Tamper Resistant Receptacles (TRR)
* For non-sheated cable, THHN is recommended
* Ground wire can be green coated or bare copper wire if
non-sheated cable is used
* Optionally install Type 2 surge protector
* Loop-in lighting wiring maybe considered when junction
boxes are not available
* Bond together all available grounding system
ONE LINE DIAGRAM
Laundry
Area
Safety Switch
60 AF
2 PST
2 Wire
M
L.O.
C.O.
Surge
Suppressor
S.P.O.
Spare
20 A
30 A
15 A
60 A
Service
Meter
Service
Entrance
Main Feeder
(2) 8.0mm²
Bond to metal
enclosure
Grounded
conductor
Ground
ring
Buried metal
water pipe
Concrete-encased
electrode
Ground
rod
Building
structure
metal frame
Grounding
electrode
6' to 8' into soil
#6 AWG
14.0 mm²
2ft drip loop,
12ft minimum
above ground
A rain-tight
service head
(weather head)
shall be provided
service eyebolt
screw
service dead-end
clamp
electrical
tape
UDC or
miniwedge
connectors
triplex aluminum
service drop
230V line-to-line
Distance and Measurement
Point of Reference: FFL
* Switches – 140cm to 150cm
* C.O. – 30cm to 40cm
* Desk lamp – 10cm above table
* Panel Board – 180cm to top of panel
DISCONNECTING
MEANS
grounded service conductor
(WHITE INSULATION)
Please send corrections and suggestions to feedback<AT>engineer.net.ph
COM
COM
ACU outlet
Each ACU must
be on a separate
branch circuit.
LINE
LOAD
GFCI
Receptacle
Laundry Area
L.O.
C.O.
S.P.O.
Laundry
Area
L.O.
C.O.
S.P.O.