Zone 22 Non-conductive dust Control Stations
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How safe is your workspace? From July 2006, the onus was placed upon companies to ensure that all equipment within their organisations is suitable for the environment in which it is being used. This was aimed particularly at areas where there may be a possibility of a combustible atmosphere being present, even for short periods. i.e. less than 10 hours/year.People normally think of such atmospheres as being gases, mists or vapours, however there are various industries where a non conductive dust mixed with air in the right proportion, can become explosive. It is these areas where the Craig & Derricott ATEX Group II (Zone 22) equipment can be used to help you comply with Health & Safety regulations.Typical industries where such atmospheres may be generated :- Grain Mills Օ Powder Coating Plant Textiles Օ Chemicals Cargo Handling Օ Woodworking Pharmaceuticals Օ Waste processing There are differing degrees of protection against explosive dusts, and Zone 22 is defi ned as :- A place, in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.Ӕ > Directive 94/9/EC (ՓManufacturers Directive ) Sets out the route equipment manufacturers must take to get their products certifi ed for use in hazardous environments. ԕ Directive 1999/92/EC (Users DirectiveӔ) Defi nes the classifi cations for protection Zones, and the approach users must take to ensure that he correct equipment is matched to specifi c hazardous environments.Both of the above are classed as ATEXђ directives, and are concerned solely with ensuring safety in the work place, DSEAR D angerous S ubstances and E xplosive A tmospheres R egulations 2002 Օ BS EN 50014:1998 Electrical apparatus for potentially explosive atmospheres. General requirements BS EN 50281-1-1:1999 Electrical apparatus for use in the presence of combustible dust Օ BS EN 60529:1992 Specifi cation for degrees of protection provided by enclosures (IP code) BS EN 60947-3:1999 Specifi cation for low-voltage switchgear and controlgear. Օ BS EN 60204-1:1998 Safety of machinery. Electrical equipment of machines. General requirementsCraig & Derricott has been manufacturing enclosed switchgear for more than 50 years. In the Trent range we have incorporated all of that experi-ence in producing an outstanding product that has now been approved for use in explosive dust atmospheres. Two purpose designed die-cast enclosures are used to cover the 25A & 32A items, whilst the 63A items are supplied in quality sheet steel enclo-sure. All items have a minimum ingress protection of IP65. The following table lists two popular formats that will fulfi l most applications, however, if you specifi cally require an alternative arrangement, then contact our technical sales staff who will advise on options available to us. > Assembly Form(See Right)Catalogue No.Enclosure Size *RatingFormat(Finished Red)25A3P+2 EB Aux2LDRM253EBZ22A6P+2 EB AuxDRM256EBZ2232A3P+2 EB Aux2BDRM403EBZ22B6P+2 EB AuxDRM406EBZ2263A3P+2 EB Aux3BDR0633EB22ZC6P+2 EB AuxDR0636EB22Z Die-Cast Padlocking Handle Form 2L Lid mounted interior (25A)Form 2B Base mounted interior (32A) Form 2 * See page 2 for sizes & fi xings can accommodate padlocking in both the Offђ & Onђ positions. Please add /10 to the cat. No. if required:- e.g. DRM403EB22Z/10 Padlocking Form 2 construction allows the use of a single padlock, whilst Form 3 will accept 2 or more.For Form 2 items it is recommended that padlocking devices with a minimum hasp diameter of 6.4mm are used. This will limit the movement of the handle away from the Offђ position. Auxiliary Contacts All versions allow the fi tting of a padlock in the Offђ position. late make when switching On The ёEB addition to the catalogue numbers denotes the inclusion of 2 off early break contacts.In all cases these are factory fi tted to the isolator interior. Form 2 auxiliary contacts are fully rated and are designed to open before the main contacts when switching ґOff. By defi nition the contacts would be Sheet Steel Enclosure Form 3B Base mounted interior page 1 > R1 Hall Lane, Walsall Wood, Walsall, West Midlands WS9 9DPt: +44(0)1543 375541 f: +44(0)1543 361619 e: sales@craigandderricott.com

ApplicationSym.UnitCategoryRating (A)25A32A63A3 Pole6 Pole Rated thermal currentI > th A25326363Rated insulation voltageU > i V690690690690Rated impulse voltageU > imp kV4.0-8.04.0Rated operational current (AC)A400/415 - AC21A25.032.063.056.0400/415 - AC22A25.032.063.045.0400/415 - AC23A25.028.063.045.0Rated operational power (AC)kW3 x 400V - AC2310.015.030.022.0 Conditional short circuit currentI > cc kA6.050.0**-8.0Minimum mechanical enduranceCycles0.3 x 10 > 6 0.5 x 10 > 6 30 x 10 > 3 -Connecting capacity-Terminal typemm > 2 Flexible cable2.5 - 6.010 max--mm > 2 Stranded cable2.5 - 6.010...

Coding: Ex II 3D EX tD A22 IP65 T85C Complies in part or full with Standards: BS EN 50014, BS EN 50281-1-1, BS EN 60529 BS EN 60947-3, BS EN 60204-1 (Must not be used in areas which exhibit conductive dust.) > The ґClassic Zone 22 pushbutton assemblies are based around the heavy duty ґ32 Series components. Housed in die-cast aluminium enclosures they offer a secure and robust answer to Emergency Stops in potentially explosive dust environments. Emergency Stop applications are a special case, and can only be fulfi lled by an assembly which operates with a single push action. Lifting a fl ap...

Material - Aluminium LM 24 (BS 1490), Colour - Light Grey RAL 7035 > Designed for basic heavy duty applications. The enclosures are supplied in a grey textured fi nish. All versions are supplied with 2 x M20 bottom entries and sealed to IP65. Data:- Coding: Ex II 3D EX tD A22 IP65 T85C Complies in part or full with Standards: BS EN 50014, BS EN 50281-1-1, BS EN 60529, BS EN 60947-5-1, BS EN 60204-1 > Hall Lane, Walsall Wood, Walsall, West Midlands WS9 9DPt: +44(0)1543 375541 f: +44(0)1543 361619 e: sales@craigandderricott.com