Type HC Universal Cubicle Earthing Set

HASEGAWA Type HC is a universal cubicle earthing set with an angle-adjustable head. In medium-voltage cubicles it is used to temporarily short-circuit and earth busbars and cable terminations once the circuit breaker and disconnector have been opened.

The set comprises a Φ26 mm insulating stick, three phase leads of 14 mm² cross-section, a 7 m long 8 mm² earth lead and a clip connector, with a total weight of 3.4 kg. Designed for narrow or deep cubicles where the busbar cannot be reached in a straight line, the HC is supplied as a genuine HASEGAWA product by HASEGAWA Türkiye, the official distributor in Türkiye.

How does a cubicle earthing set work?

In a de-energised cubicle, an open circuit breaker or disconnector alone does not provide sufficient safety: a switching error, back-feed or voltage induced from neighbouring lines can make the conductors live again. The earthing set joins the three phases at one point and connects them to earth, so that in the event of re-energisation the current flows to earth through the leads rather than through the worker, and the protection relay can trip the circuit.

With the Type HC the sequence is as follows: the 8 mm² × 7 m earth lead is clipped to the earth bar, then for each phase the end of the 1 m, 14 mm² lead is fitted to the conductor using the stick. Because the head is wide-angle adjustable, the stick can be brought into the correct position even when approaching the busbar from different directions. The set has no earth spike; the existing earth bar is used for the earth connection.

Type HC or Type HF?

	Type HC	Type HF
Head fitting	Wide-angle adjustable type	Wide-angle adjustable type
Insulating stick	Φ26 mm	Φ26 × 338 mm
Phase leads	14 mm² × 1 m × 3	22 mm² × 1.5 m × 3
Earth lead	8 mm² × 7 m × 1	8 mm² × 15 m × 1
Driven earth spike	None	Φ10
Weight	3.4 kg	3.4 kg

These two models share the same head, so the choice comes down to lead cross-section and the earthing point on site. If the earth bar is close by in the cubicle and the calculated fault current can be carried by 14 mm², the HC is sufficient; if you need thicker phase leads, a 15 m earth lead or a driven earth spike, choose the Type HF. For the standard clip-type set, see Type H.

Technical specifications

• Head fitting: wide-angle adjustable type
• Insulating stick diameter: Φ26 mm
• Phase leads: 3 × 14 mm² × 1 m
• Earth lead: 1 × 8 mm² × 7 m
• Earth clamp: clip
• Driven earth spike: none
• Weight: 3.4 kg

Limits of use and safety

The 14 mm² phase cross-section is the thinnest lead in the range, so the prospective short-circuit current and its duration must be assessed in advance for every installation where the Type HC is to be used. Using it on an installation with a higher fault current without this calculation is not recommended.

Before applying the set, absence of voltage must be checked on every phase with a suitable voltage detector, and the detector's function confirmed with a tester. Wear insulating gloves and a face shield during connection; the earth lead is attached first and removed last. Do not use the set if the angle-adjustment mechanism of the head has play, or if leads are crushed or have broken strands. General rules are covered in our article on safe working with earthing sets.

Why buy from HASEGAWA Türkiye?

• Guidance on whether the 14 mm² HC or a 22 mm² model suits the short-circuit level of your installation
• Supply support for wearing parts such as the wide-angle adjustable head and leads
• A single quotation with commercial invoice for multi-set orders sized to your crews' vehicles