Hi All,

 

Bit of a compliance question here...

 

We have been asked to fit Honeywell SC100 seismic sensors on a G3 system however the SC100's dont seem to bear any security grading. I know these are used industry wide and they are "the right" bits of kit for the job but how can they be fitted on a graded system without affecting the overall system grading?

1 hour ago, w20oda said:

Hi All,

 

Bit of a compliance question here...

 

We have been asked to fit Honeywell SC100 seismic sensors on a G3 system however the SC100's dont seem to bear any security grading. I know these are used industry wide and they are "the right" bits of kit for the job but how can they be fitted on a graded system without affecting the overall system grading?

I would have thought they have some other kind of certification as opposed to stating they are grade 2/3 

They have some German VDS approvals but nothing which is UK specific.

36 minutes ago, w20oda said:

They have some German VDS approvals but nothing which is UK specific.

Oh I thought it was french lol

Is product available that is graded?

If yes then you cant use, if no then it would yes

Also there may not be a EN for that detector (id of thought it would fall under shock though)

4 hours ago, james.wilson said:

Is product available that is graded?

If yes then you cant use, if no then it would yes

Also there may not be a EN for that detector (id of thought it would fall under shock though)

Does this not mean it reaches grade 3 requirements??? Although this is the sc105

 

 

Edited June 17, 20251 yr by al-yeti

This comes up quite often on commercial Grade 3 specifications when protecting vaults, night deposit safes, or ATM enclosures.

Under PD 6662 (the UK application guide for EN 50131), the general rule is that an installation cannot be certified to a grade higher than its lowest-graded component unless a specific exemption or technological provision applies. For seismic sensors specifically, here is how you stay fully compliant without compromising the system's Grade 3 sign-off:

1. VdS Class C Equivalence & Harmonisation:
The SC100 (and SC105) carries full VdS Class C approval (VdS 2203 / VdS 2333 for structural seismic sensors). In European alarm engineering, VdS Class C is universally recognized as the premier high-security standard for vault and safe protection—tested vigorously against diamond-core drilling, hydraulic rams, thermic lances, and explosive shock waves.
Historically, there was no published EN 50131-2 standard covering structural seismic detectors in the exact same format as standard PIRs (EN 50131-2-2) or dual-techs (EN 50131-2-4). PD 6662 explicitly accommodates third-party certified equipment (such as VdS Class C) to be integrated into Grade 3 installations where no direct EN-stamped equivalent exists for that specific application, provided it is detailed in the System Design Proposal (SDP).

2. Supplementary / Specialised Asset Protection:
If the seismic sensor is fitted as supplementary asset protection (e.g. specifically bonded to a Chubbsafes vault or ATM chest) whilst the room itself has standard Grade 3 dual-tech volumetric coverage, the overall room and building perimeter maintain Grade 3 integrity. The seismic unit is classified as a specialised target-hardening detector rather than a mandatory space trap.

3. Wiring & Tamper Configuration for G3 Sign-Off:
To ensure an inspector or insurer's surveyor doesn't flag it on a Grade 3 certificate, ensure the physical circuit meets Grade 3 wiring standards:
- Mounting Plate: Always use the SC100 mounting plate with the mechanical back-tamper (pry-off protection) engaged against the safe wall or concrete substrate.
- EOL Supervision: Wire with End-Of-Line (Dual EOL / Triple EOL) resistors matching your expander/panel curve (Galaxy, Texecom Premier Elite, or Castle/Euro) rather than standard 4-wire normally closed, so the cable itself is supervised against short-circuit tampering.
- Self-Test Trigger: Connect the remote test input (Test Generator / SC113/SC115 or internal self-test terminal) back to a programmable panel output so the panel can initiate a dynamic sensor verification test on setting.

Document it clearly on the System Design Proposal / As Fitted document as 'Asset Protection: Seismic detection via VdS Class C approved sensor' and NSI/SSAIB auditors will pass it without issue.