Sarel Electrical enclosures Sarel Enclosures Guide Sarel Enclosures Installation

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Sarel Electrical enclosures Sarel Enclosures Guide Sarel Enclosures Installation
Sarel Electrical enclosures wall mounted floor standing rack steel grp boxes     

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Sarel
Electrical enclosures
Sarel Enclosures Guide
Sarel Enclosures Installation

Selection of enclosures is generally regarded as a simple process, determined by the requirement of size together with a passing, often misguided reference to IP ratings.

Enclosure technology, although perceived as being relatively simple, is continually evolving to meet the demands of new applications which not only raise new questions concerning potentially adverse environmental conditions but which also create the requirement for an increasing array of new features.

The materials of construction are in themselves a whole area of technological involvement, with welded mild and stainless steels; hot press moulded GRP and complex plastic mouldings in ABS, PVC, polycarbonate, polystyrene etc.

Outdoor Installations

In many instances the automatic choice for enclosures is mild steel but the use of such enclosures outdoors is questionable but continues for reasons which have little to do with the enclosure itself – cost, convenience, habit and familiarity. All are valid reasons but each is self-limiting, and still ignores the fact that steel rusts.

Despite the best in preparation, painting, plating and handling, ultimately the corrosive propensity of the basic material may affect the suitability of the application performance, which is, basically to provide a protective envelope housing sensitive or potentially harmful electrical equipment.

Mild steel enclosures therefore are not ideal, but they do offer advantages and are apparently a cost-effective solution in many instances. So what are the alternatives, and what can be done to improve the chances of a successful installation with a mild steel enclosure left alone to the mercy of the elements?

Use a corrosive resistant material instead; there is a wide range of products, which Sarel can offer, principally glass fibre reinforced polyester and stainless steel. Such materials drastically reduce or completely eliminate problems of corrosion where conditions would be too problematical for mild steel.

One key additional advantage is that cost differentials have narrowed over recent years. Moulding techniques and material advances now ensure that GRP enclosures are of more than adequate strength for most applications including street and trackside furniture.

They offer a measure of additional safety where vandalism is concerned; a damaged steel enclosure can become live, a GRP one cannot.

For added strength, GRP enclosures such as root pillars are simply made of thicker material with reinforcing ribs but without the weight penalties of steel.

Consequently, in many cases where the capital cost is not the prime consideration, use of a corrosion resistant product can be inherently more satisfactory and can also work out cheaper by eliminating maintenance costs.

Aspiration & Condensation

These two phenomena frequently combine to produce substantial quantities of water within the enclosure. Aspiration occurs as a consequence of rising and falling temperatures; when the daytime temperature is high the air in the enclosure expands and some is expelled – creating a partial vacuum; when the temperature falls, cool moisture laden air is drawn in, and when it reaches its dewpoint the moisture condenses and is deposited on components and
the enclosure. The whole process is cyclical and can eventually produce an incredible amount of water.

The consequence, apart from the very real danger of electrical shorting, is to cause internal corrosion in steel installations; correct use of thermal management equipment can help prevent these problems.

Working On The Enclosure

The following are common sense tips, which can help to ensure a successful installation:

Inspect outer packaging on delivery as damaged wrapping may mean the enclosure itself has been damaged in transit.

Do not insert a knife into the packaging, e.g. to cut tape, as there is a risk of scoring the paint finish.

Do not drag the enclosure across workshop floors – use approved lifting methods.

Clear swarf from workbenches and make sure work surfaces are free from debris.

Empty the enclosure of any swarf or filings before installation as condensation may corrode them.

When marking out do not score paint surfaces.

Repaint bared hole edges.

Use sharp cutting tools to avoid cracking paint.

Use punches in preference to drills.

Seek manufacturer’s advice on care of seals and paint selection before removing seals or overpainting.

Remember all work should be such as to maintain the IP integrity.

Check the loading of equipment to be fitted, as distortions of mountings or doors may affect the sealing.

Final inspection should be conducted before transportation from the workshop.

Site Installation

Ensure walls/floors are plumb and level and in good condition.

On external locations, site on the lee side of buildings where possible. Canopies are recommended to deflect direct rainfall, as are pedestals to raise enclosures from wet floors.

Floor standing enclosures which are not designed to be free standing should be bolted back to a wall or stanchion for stability.

Cable entries must be supported outside the box, so that no stress is caused to the enclosure, as deformation may degrade the sealing.

Earthing continuity should conform to relevant local standards.

The installation should comply with the relevant standards as specified by the user. Selection of the enclosure should conform to the relevant BS or equivalent standard.

A planned maintenance programme is advisable, checking gaskets, paintwork, hinges, locks etc, for signs of physical damage, tampering or corrosion.

Further Information

For further information on Sarel products, please contact us at via the form below.

 

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Sarel - A Guide to Enclosure Selection & Installation


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Swindon
Wiltshire
SN3 4TQ

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Sarel Electrical enclosures Sarel Enclosures Guide Sarel Enclosures Installation

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