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Logan

Fire alarm isolator

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Indication can be mechanical though I guess?


So, I've decided to take my work back underground.... to stop it falling into the wrong hands

 

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14 hours ago, james.wilson said:

So no indication needed either? Ive always used something like this

2648_product.jpg

 

The plaggy one's with 901 key are the same £


Mr:)

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Quote

Every isolator and protective device that can isolate the supply to the fire detection and fire alarm
system, other than the main isolator for the building, should be labelled either:
1) “FIRE ALARM”, in the case of a protective device that serves only the fire alarm circuit, but
incorporates no switch;
2) “FIRE ALARM. DO NOT SWITCH OFF”, in the case of a switch (whether incorporating a
protective device or not) that serves only the fire alarm circuit; or
3) “WARNING. THIS SWITCH ALSO CONTROLS THE SUPPLY TO THE FIRE ALARM SYSTEM”, in
the case of any switch that disconnects the mains supply to both the fire alarm system and
to other circuits.
g) Labels should be clear and in durable fade resistant material.
h) Every isolator, switch and protective device that is capable of disconnecting the mains supply
to the fire detection and fire alarm system should be situated in a position inaccessible to
unauthorized persons or be protected against unauthorized operation by persons without a
special tool.
NOTE 5 A special tool in this context is a tool not likely to be carried by a member of the general public. Slotheaded
screws would not be acceptable, since various articles can be used as screwdrivers.
i) The circuit supplying the fire detection and fire alarm system should not be protected by a residual
current device unless this is necessary to conform to BS 7671. Where a residual current device is
necessary for electrical safety, a fault on any other circuit or equipment in the building should not
be capable of resulting in isolation of the supply to the fire detection and fire alarm system.
j) Irrespective of the condition of any standby battery (e.g. disconnected or fully discharged), the
mains power supply should be capable of supplying the maximum alarm load of the system (see
3.37).

looks like dp is no longer needed


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14 minutes ago, james.wilson said:

looks like dp is no longer needed

That surprises me as usually you have to disconnect all live conductors.. (and with neutral being classed as a live conductor surely this means L & N)

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it used to say dp in 5839. I havnt looked but it may say that in 7671 for 'isolator' as it references that document.

Ill still use double pole so i know its compliant either way


securitywarehouse https://www.securitywarehouse.co.uk

Trade Members please contact us for your TSI vetted trade discount.

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So would a fused spur with a label on it saying "fire alarm supply" would be compliment?

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20 minutes ago, sixwheeledbeast said:

"special tool" specifically not a flat blade.

Did you read the quoted regs above?

Then how is this compliment if you can pull the fuse out with a flat blade

 

2648_product.jpg.3fab74c8c01187bcc51e9b0d839086fc.jpg

Edited by Logan

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12 minutes ago, james.wilson said:

Good point. 

I think the isolator with 901 key is probably the best design 

s-l400.jpg

Edited by Logan

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3 minutes ago, Logan said:

I think the isolator with 901 key is probably the best design 

 

1576787692396635831213321481471.jpg

These are good

  • Upvote 1

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On 18/12/2019 at 15:10, james.wilson said:

NOTE 5 A special tool in this context is a tool not likely to be carried by a member of the general public.

 

Except for me

20191219_203803.jpg

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Just now, Shaunb1905 said:

This is what we use, only bad thing is they require a deep back box 

DAAC15F3-C8CB-45E8-B61E-6A972D08493F.jpeg

Bad thing needs key imo

 

Where is fuse?

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6 minutes ago, Shaunb1905 said:

Doesn’t need a fuse 

What doesn't?

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10 minutes ago, Shaunb1905 said:

This is what we use, only bad thing is they require a deep back box 

DAAC15F3-C8CB-45E8-B61E-6A972D08493F.jpeg

 

You buying c-tec ones ?

 

 


Mr:)

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16 minutes ago, Shaunb1905 said:

Doesn’t need a fuse 

Or you mean panel doesn't need fuse protection only isolation point according to regs yes?

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Plug top fuses are only to protect any flexible cable between the outlet and the appliance from overload.

Would have no functional purpose if MCB is rated correctly for the cabling which should be fireproof from there.

 

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31 minutes ago, sixwheeledbeast said:

Plug top fuses are only to protect any flexible cable between the outlet and the appliance from overload.

Would have no functional purpose if MCB is rated correctly for the cabling which should be fireproof from there.

 

I plan to fp200 from my fusebox in the shed. Ther is a 5 amp mcb for lighting and 10 amp for sockets.  Should i add another MCB (5 amp) to the fusebox or spur off a existing circuit.   There is also a rcd.    The main supplyto the shed is 16 amps

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5 minutes ago, james.wilson said:

but a terminal will remove the fuse

 

snake eyed ;)


Mr:)

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