CEA 4001 - Electrically Driven Pumpsets

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65

supply the

flow

rate

equal

to

the

maximum

demand

flow

plus

20%,

at

a

pressure

of

at

least

1

bar,

as

measured

at

the pump

inlet.

This

test

shall

be

carried

out

at

a

time

of

maximum

demand

on

the

main.

9.7.6 Pressure switches

9.7.6.1 Number of pressure switches

Two

pressure

switches

shall

be

provided

to

start

each

pumpset,

connected

in

series

with

normally

closed

contacts.

9.7.6.2 Pump start

The

pumpset

shall

start

automatically

when

the

pressure

in

the

trunk

main

falls

to

a

value

of

not

less

than

0,8

x

P,

where

P

is

the

pressure

when

the

pumps

are

churning.

Where

two

pumpsets

are

installed,

the

second pump

shall

start

before

the

pressure

falls

to

a

value

of

not

less

than

0,6

x

P.

Once

the

pump

has

started,

it shall

continue

to

run

until

stopped

manually.

Where

one

of

the

pumpsets

is

electric

motor

driven

this

shall

be

the

first

to

start.

9.7.6.3 Testing the pressure switches

Means

shall

be

provided

for

testing

each

pressure

switch.

If

any

isolating

valve

is

installed

on

the

connection

between

the

trunk

main

and

any

pump

starting

pressure

switch,

a

back

pressure

valve

shall

be

installed

in parallel

with

the

isolating

valve

so

that

a

fall

in

pressure

on

the

trunk

main

will

be

transmitted

to

the

pressure switch

even

when

the

isolating

valve

is

closed.

9.8 Electrically driven pumpsets

9.8.1 General

9.8.1.1

In

some

countries

the

authorities

allow

two

electrically

driven

pumps

under

certain

conditions.

9.8.1.2

The

electric

supply

system

shall

be

available

at

all

times.

9.8.1.3

Documentation,

such

as

installation

drawings,

main

supply and

transformer

diagrams

and connections

for

supplying

the

pump

controller

panel

as

well

as

motor,

control

alarm

circuits

and

signals

shall

be

kept

available

in

the

sprinkler

valve

or

pump

room

and

be

up

to

date

at

all

times.

9.8.1.4

The

pump

shall

be

fully

operational

within

15

seconds

of

the

beginning

of

any

starting

sequence.

9.8.2 Electricity supply

9.8.2.1

The

supply

to

the

pump

controller

shall

be

solely

for

the

use

of

the

sprinkler

pumpset

and

separate

from

all

other

connections.

Where

permitted,

the

electrical

supply

to

the

pump

controller

shall

be

taken

from

the

input

side

of

the

main

switch

on

the

incoming

supply

to

the

premises

and

where

this

is

not

permitted,

by

a

connection

from

the

main

switch.

The

fuses

in

the

pump

controller

shall

be

of

high

rupturing

capacity,

capable

of

carrying

the

stalled

motor current

for

a

period

of

not

less

than

75

%

of

the

time

needed

for

the

motor

windings

to

fail

and

thereafter

be able

to

carry

the

normal

current

plus

100%

for

a

minimum

of

5

hours.

9.8.2.2

All

cable

shall

be

protected

against

fire

and

mechanical

damage.

The

protection

shall

be

accepted

by

the

authorities.

NOTE

1:

all

wiring

associated

with

the

electric

motor

driven

pump,

including

the

monitoring

circuits,

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