PL7 Series Enclosures Technical Information
General
These Enclosures are a self coloured black anti-static glass reinforced polyester design with integral continuity plate that meet the requirements of Exe to EN50014 & EN50019. The PL7 Series Enclosures are of a robust design with a very high impact strength of up to 20Nm and have excellent electrical insulation properties.
Application
These Enclosures may be supplied with fitted terminals or as an empty component approved Enclosure. If supplied as the latter, then final certification by the customer after fitting their own equipment, must be obtained. In this case the prefix 'Z' is used i.e. ZPL712.
Specification
- Certification -
II2 GD Exe II 
and 
Options available. - Zones of Use - Zone 1, Zone 2, Zone 21 & Zone 22.
- Temperature Class & Ambients - T6 40°C as standard. Optional T5 with ambients up to 65°C.
- Operating Temperature Range- -20°C to +75°C.
- Degree of Protection - IP66 and Deluge proof to DTS01.
- Material - Glass Reinforced Polyester. Flame Retardant to (IEC92.1 clause 2.38).
- Finish - Natural Black.
- Impact Resistance - Up to 20Nm.
- Weatherproofing - By captive moulded clear silicone gasket.
- Certification Label - Stainless Steel or optional certified self adhesive foil.
- Lid Fixing Screws - Stainless Steel (complete with nylon retaining washer).
- Additional Options - Breather/Drain devices. Internal/external earth stud if not using earth/mounting feet. Epoxy paint finish for colour coding. EMI/RFI coating for EMC requirements.
- Additional Labels - Stainless Steel or laminated plastic (traffolyte) for external use only or optional (certified) self adhesive foil for external and/or internal use.
Earth Continuity
These Enclosures have an integral earth continuity plate in plated Mild Steel as standard with option for Brass. The continuity plate is moulded into the inside faces of the Enclosure to give electrical continuity between the Cable Gland entries. The plate extends through the wall of the Enclosure to the external mounting feet providing internal to external earthing as well as additional mechanical strength. There is assured earthing for the Cable Gland entry via the tapped hole in the continuity plate without the need for a locknut.
Technical Notes
To ensure that the maximum temperature as permitted by certification is not exceeded, the Dissipated Wattage Factor Formula is used : W = N x F x I². Enclosure wattage factor.
It is not permitted to fit more than one conductor per side in rail or direct mounted terminals unless using an insulated Bootlace Ferule.
Different quantities of terminals. Linked and mixed terminal arrangements other than those specified in the data tables are available but the voltage and current figures will be affected to ensure the maximum certified wattage factor is not exceeded. Please contact Hawke Technical Sales.
When connecting a terminal with a conductor that is less than maximum size permitted for that terminal type, the maximum amps per pole must be reduced to suit. i.e. an RM10 (10mm)² terminal fitted with a 4mm² conductor will have the current rating reduced to that of the current rating permitted through the RM4 (4mm²) terminal.
For Intrinsically Safe Applications, Exe power terminals can be supplied in blue on request. (Note: the Enclosure will remain Exe certified).
An earth terminal must be fitted inside the Enclosure in accordance with EN 50014 : 1997 : clause 15.4.( Note: Power terminals may be used as 'clean earths'.)
The Enclosure has tapped Metric entry threads as standard. Alternative parallel threads are available provided they are to a recognised standard e.g. BSPP, ET etc. Tapered threads are not permitted in plastic Enclosures due to risk of stress cracking.
The customer may drill and tap entry holes in the Enclosure providing they use a special stepped drill available from Hawke, and the holes are in accordance with the relevant code of practice and comply with the details shown on this website.
When mixed entries are accommodated on a face they must be in the positions specified for the largest Cable Gland entry on that face. For complex mixed entries contact Hawke Technical Sales.
Entries into the Enclosure must be via a suitable approved entry device.
All unused entry holes must be fitted with a Stopping Plug as listed on the Enclosures 'ATEX' certificate only.
