R-1 — لوائح التركيبات الكهربائية
750 الدوائر النهائية
الصفحة 30 في الوثيقة الأصلية
عرض PDF750 FINAL CIRCUITS
750-1 Each final circuit shall be connected to a separate way of a distribution board, a consumer service unit
or a splitter switch.
750-2 The wiring of each final circuit shall be electrically separate from that of every other final circuit and
each circuit shall be provided with its own separate neutral.
EXCEPTION: In ware-houses, factories, workshops, hangars and other larger areas where it is desirable to
Connect adjacent lights to different phase of the supply, it is permissible to employ
a three-phase and neutral circuit comprising of 4-wires as a final circuit provided the circuit
is controlled by a triple pole breaker in the distribution board.
750-3 Final circuit having a rating exceeding 15/16 amperes shall not supply more than one point.
EXCEPTION: 1. 13 ampere socket outlets connected to a radial or a ring circuit as per Clause 750.10 and
750.11.
2. Two or more 30/32 ampere socket outlets feeding portable x-ray or welding equipment
etc. may be connected to one final circuit and protected by a maximum 30/32 ampere
fuse or circuit breaker provided it is ascertained that the maximum load on the circuit
will not exceed 30/32 amperes and the circuit wiring is rated as minimum for this
current.
3. Two or more 60/63 ampere socket outlets feeding portable x-ray or welding equipment,
etc. may be connected to one final circuit and protected by a maximum 60/63 ampere fuse
or circuit breaker provided it is confirmed that the maximum demand on the circuit will
not exceed 60/63 amperes and the circuit wiring is rated as minimum for this rating.
4. A cooker control unit incorporating a socket outlet or a lighting track system in
which individual luminaries arc suitably protected against excess current.
750-4 No cable with a conductor smaller than 1.5 mm 2 shall be used as a final circuit.
750-5 A 1.5 mm 2 cable may be employed as a final circuit for supplying lighting points and protected by a
fuse or circuit breaker of 10 amps rating provided the circuit loading is limited to 2000 VA.
NOTE- Circuits for discharge lamps including fluorescent lamps shall be designed to carry the total
steady current viz., that of the lamp and any associated control gear and also their harmonic
current. Where more exact information is not available, the demand in volt-amperes may be
taken for the purpose of this regulation as the rated lamp watts multiplied by not less than 1.8.
This multiplier is based on the assumption that the circuit is corrected to a power factor of
0.851agging as required per Clause 313 and also takes into account control gear losses and
harmonic current.
750-6 Cables with conductors of 2.5 mm ² or greater may also be employed for supplying lighting points
where large distances or high wattage fittings are involved.
750-7 Two socket outlets of 13 amps rating may be connected to a single phase and neutral circuit wired
with 2.5mm² cable, protected by a fuse or circuit breaker of rating not exceeding 15/16 amps.
750-8 One socket outlet of 15 /16 amps rating may be connec ted to a single phase and neut ral circuit
wired with 2.5 mm² cable, protected by a fuse or circuit breaker not exceeding 15/16 amps.
750-9 Six socket outlets of 13 amps rating may be connected to a single phase and neutral circuit wired
with 2.5 mm² cable, protected by a fuse or circuit breaker of rating not exceeding 15/16 amps, serving one
room only of less than 50 sq. metres floor area which is not a kitchen, provided that no fixed water heater or
window air conditioning unit shall be connected to any of those points.
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750-10 Six socket outlets of 13 amps. rating may be connected to a single phase and neutral circuit wired
with 4 mm² cable, protected by a circuit breaker of rating not exceeding 25 amps, provided that the total
connected load of the circuit does not exceed 5 KVA and the floor space is less than 75 sq. metres . Such a
circuit shall not include for more than one window air conditioning unit or one water heater.
750-11 Ten socket outlets of 13 amps rating may be connected to a single phase an d neutral ring circuit
subject to the following provisions:
1. The floor space is not exceeding 100 sq. metres.
2. The circuit shall consist of a ring of 2.5 mm² cable looped from one socket to the next throughout
the
circuit and from the last socket back to th e distribution board. Except in the case of sockets
connected on a spur as indicated in sub-clause 5, not more than two conductors shall be connected
into one terminal of any socket. No joints shall be permitted in any box housing a socket.
3. The circuit shall be protected by a fuse or circuit breaker of rating not exceeding 30/32 Amps.
4. The circuit shall not feed more than one window type air conditioning unit or one water heater.
5. Ring circuit shall not be us ed where there is any likelihood of the total connected load of the
circuit
exceeding 7 KVA.
6. In special situations not more than two sockets may be connected as a spur from the ring.
7. A diagram illustrating the ring circuit appear as an appendix to this Regulations.
750-12 All wire sizes indicated in sub-clause 750.4 to 750.11 inclusive, relate to PVC insulated cables run
as single circuits viz: without assuming any grouping factor. Where mineral insulated cables or cables wi th
other insulating materials are employed for final circuits, the wire sizes stipulated in the above sub -
clauses may be appropriately reduced and wire sizes having the same current rating as those specified f'or
PVC insulated cables may be employed.
750-13 Where two socket outlets are housed in one common box, this will be considered as one outlet only
for purposes of interpreting sub-clauses 750.7 to 750.11 both inclusive.
750-14 All single phase socket outlets in any one room sha ll normally be connected to the same phase of
the supply. In larger rooms and other areas, socket outlets may be connected to different phases of the
supply provided always that the outlets connected to any one phase are grouped together and no two s ocket
outlets connected to different phases of the supply are less than 2 metres apart.
EXCEPTION: Where an under-floor ducting system is employed the minimum distance between
any two outlets connected to different phases of the supply may be further reduced
to 1.2 metres.
750-15 Fixed window type air conditioning units connected to a ring circuit shall be connected to the
circuit only by means of a socket and plug. Other fixed equipment like water heaters, connected to a ring
circuit shall be connected to the circuit only by means of a switch fuse or circuit breaker of 15/16 Amps
rating. The number affixed equipment that may be connected to one ring circuit shall be in accordance with
Clause 750.ll.(3).
750-16 A shaver outlet provided with a double wound isolating transformer may be connected to a
lighting circuit.
750-17 For all other final circuits the size of cable employed shall be suitable for the load connected and no
diversity shall be allowed. Section 15 provides a detailed method of selecting circuit sizes and the excess
current protective device to be employed, which shall be adhered to for all circuits.
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750-1 Each final circuit shall be connected to a separate way of a distribution board, a consumer service unit
or a splitter switch.
750-2 The wiring of each final circuit shall be electrically separate from that of every other final circuit and
each circuit shall be provided with its own separate neutral.
EXCEPTION: In ware-houses, factories, workshops, hangars and other larger areas where it is desirable to
Connect adjacent lights to different phase of the supply, it is permissible to employ
a three-phase and neutral circuit comprising of 4-wires as a final circuit provided the circuit
is controlled by a triple pole breaker in the distribution board.
750-3 Final circuit having a rating exceeding 15/16 amperes shall not supply more than one point.
EXCEPTION: 1. 13 ampere socket outlets connected to a radial or a ring circuit as per Clause 750.10 and
750.11.
2. Two or more 30/32 ampere socket outlets feeding portable x-ray or welding equipment
etc. may be connected to one final circuit and protected by a maximum 30/32 ampere
fuse or circuit breaker provided it is ascertained that the maximum load on the circuit
will not exceed 30/32 amperes and the circuit wiring is rated as minimum for this
current.
3. Two or more 60/63 ampere socket outlets feeding portable x-ray or welding equipment,
etc. may be connected to one final circuit and protected by a maximum 60/63 ampere fuse
or circuit breaker provided it is confirmed that the maximum demand on the circuit will
not exceed 60/63 amperes and the circuit wiring is rated as minimum for this rating.
4. A cooker control unit incorporating a socket outlet or a lighting track system in
which individual luminaries arc suitably protected against excess current.
750-4 No cable with a conductor smaller than 1.5 mm 2 shall be used as a final circuit.
750-5 A 1.5 mm 2 cable may be employed as a final circuit for supplying lighting points and protected by a
fuse or circuit breaker of 10 amps rating provided the circuit loading is limited to 2000 VA.
NOTE- Circuits for discharge lamps including fluorescent lamps shall be designed to carry the total
steady current viz., that of the lamp and any associated control gear and also their harmonic
current. Where more exact information is not available, the demand in volt-amperes may be
taken for the purpose of this regulation as the rated lamp watts multiplied by not less than 1.8.
This multiplier is based on the assumption that the circuit is corrected to a power factor of
0.851agging as required per Clause 313 and also takes into account control gear losses and
harmonic current.
750-6 Cables with conductors of 2.5 mm ² or greater may also be employed for supplying lighting points
where large distances or high wattage fittings are involved.
750-7 Two socket outlets of 13 amps rating may be connected to a single phase and neutral circuit wired
with 2.5mm² cable, protected by a fuse or circuit breaker of rating not exceeding 15/16 amps.
750-8 One socket outlet of 15 /16 amps rating may be connec ted to a single phase and neut ral circuit
wired with 2.5 mm² cable, protected by a fuse or circuit breaker not exceeding 15/16 amps.
750-9 Six socket outlets of 13 amps rating may be connected to a single phase and neutral circuit wired
with 2.5 mm² cable, protected by a fuse or circuit breaker of rating not exceeding 15/16 amps, serving one
room only of less than 50 sq. metres floor area which is not a kitchen, provided that no fixed water heater or
window air conditioning unit shall be connected to any of those points.
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750-10 Six socket outlets of 13 amps. rating may be connected to a single phase and neutral circuit wired
with 4 mm² cable, protected by a circuit breaker of rating not exceeding 25 amps, provided that the total
connected load of the circuit does not exceed 5 KVA and the floor space is less than 75 sq. metres . Such a
circuit shall not include for more than one window air conditioning unit or one water heater.
750-11 Ten socket outlets of 13 amps rating may be connected to a single phase an d neutral ring circuit
subject to the following provisions:
1. The floor space is not exceeding 100 sq. metres.
2. The circuit shall consist of a ring of 2.5 mm² cable looped from one socket to the next throughout
the
circuit and from the last socket back to th e distribution board. Except in the case of sockets
connected on a spur as indicated in sub-clause 5, not more than two conductors shall be connected
into one terminal of any socket. No joints shall be permitted in any box housing a socket.
3. The circuit shall be protected by a fuse or circuit breaker of rating not exceeding 30/32 Amps.
4. The circuit shall not feed more than one window type air conditioning unit or one water heater.
5. Ring circuit shall not be us ed where there is any likelihood of the total connected load of the
circuit
exceeding 7 KVA.
6. In special situations not more than two sockets may be connected as a spur from the ring.
7. A diagram illustrating the ring circuit appear as an appendix to this Regulations.
750-12 All wire sizes indicated in sub-clause 750.4 to 750.11 inclusive, relate to PVC insulated cables run
as single circuits viz: without assuming any grouping factor. Where mineral insulated cables or cables wi th
other insulating materials are employed for final circuits, the wire sizes stipulated in the above sub -
clauses may be appropriately reduced and wire sizes having the same current rating as those specified f'or
PVC insulated cables may be employed.
750-13 Where two socket outlets are housed in one common box, this will be considered as one outlet only
for purposes of interpreting sub-clauses 750.7 to 750.11 both inclusive.
750-14 All single phase socket outlets in any one room sha ll normally be connected to the same phase of
the supply. In larger rooms and other areas, socket outlets may be connected to different phases of the
supply provided always that the outlets connected to any one phase are grouped together and no two s ocket
outlets connected to different phases of the supply are less than 2 metres apart.
EXCEPTION: Where an under-floor ducting system is employed the minimum distance between
any two outlets connected to different phases of the supply may be further reduced
to 1.2 metres.
750-15 Fixed window type air conditioning units connected to a ring circuit shall be connected to the
circuit only by means of a socket and plug. Other fixed equipment like water heaters, connected to a ring
circuit shall be connected to the circuit only by means of a switch fuse or circuit breaker of 15/16 Amps
rating. The number affixed equipment that may be connected to one ring circuit shall be in accordance with
Clause 750.ll.(3).
750-16 A shaver outlet provided with a double wound isolating transformer may be connected to a
lighting circuit.
750-17 For all other final circuits the size of cable employed shall be suitable for the load connected and no
diversity shall be allowed. Section 15 provides a detailed method of selecting circuit sizes and the excess
current protective device to be employed, which shall be adhered to for all circuits.
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