Watertight is an enclosure method that provides a high degree of protection against the entry of water during temporary submersion.
Enclosures with a Type 4X & IP66 rating are constructed for either indoor or outdoor applications providing a degree of protection against splashing water, seepage of water, falling or hose directed water an severe external condensation. The are corrosion and sleet resistant but not sleet or ice proof.
Conduit hubs or equivalent are required for watertight connection at the conduit entrance and mounting means external to the equipment cavity.
It happens. Even when the enclosure is built of rugged engineered polymer and industrial strength components, a door can inadvertently come off, be left open or damaged.
While Guardian’s weather resistant telephones are constructed to stand up to outdoor climates even without their doors, they are an essential component of the protection package and should be replaced as soon as possible.
Guardian Weather Resistant telephones meet or exceed the requirements of the classifications for which the telephones are registered. These standards are set by various independent agencies such as the Canadian Standards Association (CSA), Underwriters Laboratories (UL) and International Electrotechnical Commission (IEC).
Guardian Weather Resistant Telephones are housed in a Type 3R enclosure for use outdoors and feature encapsulated circuitry impervious to water condensation and dust.
Weather Resistant is an enclosure method that provides a high degree of protection from rain, snow, windblown dust, splashing and hose-directed water and is undamaged by external formation of ice.
“This type of enclosure provides a degree of protection to personnel against access to hazardous parts; to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt); to provide a degree of protection with respect to harmful effects on the equipment due to the ingress of water (rain, sleet, snow); and that will be undamaged by the external formation of ice on the enclosure.” 1
1Modified from a statement from the National Electrical Manufacturers Association Approved by NEMA Enclosures Section 1300 N. 17th Street, Suite 1752 Nov 2005 Rosslyn, VA 2220920, Nov. 2005
Explosion proof is essentially low tech. A great deal of the safety of explosion proof technology rests in the brute strength designed into the enclosure. Guardian’s EXT-401 Explosion Proof Telephone is housed in a flame-proof enclosure of cast, cooper-free aluminum.
The enclosure has openings for wiring to pass through. Each opening is designed and constructed to block the passage of any gases from the interior. Similarly, the back plate is sealed and secured to maintain the explosion proof nature of the housing.
While it is unlikely, if the telephone’s operation or a fault were to create an arc or spark in the enclosure and ignite gases or vapors within the phone, any detonation is contained in the housing. Should gases escape they are cooled sufficiently that they are relatively harmless by the time the reach the outside.
Performance and features are not compromised due to the design of the telephone which operates at normal telephone voltages.
Intrinsically safe equipment is designed so that under normal operating conditions, or in the event of a fault, a spark or arc is incapable of causing an ignition of gases, vapors, or dust due to lower electrical energy.
One of the major features of intrinsically safe technology is that it relies on lower voltage/current in order to prevent arcing or sparking.
An important consequence of reduced voltage is that intrinsically safe equipment is constrained by these lower voltages. This means that some features must be eliminated and performance is reduced.
Hazardous locations are defined as places where concentrations of flammable gases, vapors, or dusts occur. Electrical equipment that is installed in hazardous locations are designed and tested to ensure that it does not initiate an explosion, due to arcing contacts or high surface temperature of equipment.
Various standards and regulatory bodies establish classifications in North America, Europe and other jurisdictions around the world. They reflect environmental conditions and elements within that environment.
For General Information on Hazardous Areas Classes, Groups & Divisions (ATEX, NEC, CEC, IEC) go to Guardian Telecom’s Knowledge Base.
Non-incendive technology relies on design and construction to produce a piece of equipment that performs safely and effectively without arcing or sparking.
A non-incendive telephone’s components are designed so that under normal operating conditions or in the event of a fault they are incapable of igniting vapors or gases that maybe present.