# Mortar Sprayer for Manhole Rehabilitation: Site Power

Canonical: https://reliancetrenchless.com/en-GB/blog/mortar-sprayer-site-power

Published: 2026-08-29 · Updated: 2026-08-29 · By Reliance Trenchless

What to confirm before ordering a mortar spraying system: list every powered component, read nameplate values, and record site voltage, phase and frequency.

A mortar spraying system is not one motor. The pump, mixer, spraying head and winch can have different supply requirements, and the site has to provide the right voltage, phase, frequency and protection for each. A quotation that lists only the pump model leaves the electrical interface to be discovered on site.

The Reliance mortar sprayer brochure separates the pump and mixer from the spraying head and winch. It gives 3-phase 380 V / 50 Hz values for the pump and mixer, and two-phase 220 V / 50 Hz values for parts of the spraying system. Those fields are the start of a site-power review, not a statement that every site can connect the equipment.

## Why does site power belong in the quotation?

The equipment has to run on the supply that exists at the manhole, not on the supply assumed in the catalogue. Voltage, phase, frequency, current, cable length, earthing and protection all affect whether the system can be connected and operated safely. The buyer should not have to reconstruct those requirements after the order.

HSE's construction electricity guidance treats site electrical systems as a risk area that needs planning and competent selection. That principle applies here: the equipment supplier can state the equipment's requirements, but the site has to confirm the supply and the connection method.

![Conceptual diagram of a mortar spraying system showing the pump, mixer, spraying head, winch and control connection, with numbered callouts.](https://reliancetrenchless.com/assets/img/Blog/mortar-sprayer-site-power/mortar-power-components.svg)

**Every powered component has its own field.** 1: pump drive; 2: mixer drive; 3: spraying head; 4: winch; 5: control and cable; 6: site supply. The diagram identifies the items to schedule, not a wiring arrangement for a particular site.

## 1. List every powered component

Start with the system configuration, not only the main pump. The brochure describes a modular system with a pump, mixer, spraying head and winch. Each powered item has its own supply field.

Make a list that includes:

- the pump drive;
- the mixer drive;
- the spraying head;
- the winch, if used;
- any lighting, heater or auxiliary equipment included in the scope;
- the control arrangement and cable length.

Then mark which items are included in the proposed configuration. A standard pump and a large pump have different drive ratings, and a spraying head may be supplied separately from the pump. Do not assume that one brochure page describes the whole package.

## 2. Read the nameplate and table values

Record the values as printed, with their units. The brochure's standard pump table gives a dual-speed 4.5/5.5 kW drive and a 3 kW mixer drive on 3-phase 380 V / 50 Hz. The large table gives 6.5/8.0 kW or 7.5 kW for the pump and 4 kW for the mixer, also on 3-phase 380 V / 50 Hz. The spraying-head table gives a 2-phase 220 V / 50 Hz head with a 1800 W rating, and a 730 W / 220 V winch.

These values describe the equipment at the stated supply. They do not tell you that a particular site has that supply, that the cable is adequately sized, or that the starting current can be carried. They also do not tell you whether the site frequency is 50 Hz or 60 Hz.

If the nameplate and the brochure table differ, record both and ask which applies to the offered unit. A model name is not a substitute for the nameplate of the actual machine.

## 3. Describe the site supply in the same units

The site description should answer the equipment fields directly. State the voltage, phase, frequency, available current or breaker rating, socket or connection type, cable distance from the supply point, earthing arrangement and who will make the final connection.

Also describe the environment. Is the supply outdoors, in a wet area, or at a manhole with limited space? Is a generator proposed? If so, record its rating, waveform and earthing arrangement, and ask the supplier to confirm compatibility. Do not treat a generator as an equivalent supply without that review.

| Component | Brochure field to check | Site question |
| --- | --- | --- |
| Pump drive | kW, phase, voltage, frequency | Can the site supply the starting and running load? |
| Mixer drive | kW, phase, voltage, frequency | Is it on the same supply or a separate circuit? |
| Spraying head | W, phase, voltage, frequency | Is the stated two-phase supply available at the work position? |
| Winch | W, voltage | Is the control and cable route suitable? |
| Control and cable | Length, protection, connection | Who supplies, inspects and connects it? |
| Generator, if used | Rating, waveform, earthing | Has the supplier confirmed compatibility? |

The table is an interface record, not a wiring instruction. Final electrical work should be carried out by a competent person under the site's rules.

## 4. Resolve the interface before the order

Ask the supplier to mark the offered configuration against the site schedule. If an item is optional, say whether it is included. If the site supply differs from the brochure value, ask for the available configuration rather than planning to convert the equipment after delivery.

Keep the answer with the order. A sentence such as "380 V is available" is not a complete interface record if it omits phase, frequency, current and connection type. A photograph of a socket is useful, but it does not replace the nameplate and the supply schedule.

Manhole work also has a separate access and confined-space review. OSHA's confined-space standard for construction addresses entry procedures, atmospheric testing, attendants and rescue planning. Electrical compatibility does not satisfy those requirements, and a confined-space plan does not confirm the power supply.

The [mortar sprayer product page](https://reliancetrenchless.com/en-GB/products/mortar-sprayer-system) carries the current configuration information. The [manhole equipment guide](https://reliancetrenchless.com/en-GB/resources/manhole-rehabilitation-pumps-mixers-spray-heads) explains how the pump, mixer and spray head are specified as a system. Use both with the site schedule.

![Conceptual two-column schedule comparing equipment nameplate fields with site supply fields.](https://reliancetrenchless.com/assets/img/Blog/mortar-sprayer-site-power/mortar-site-power-schedule.svg)

**Compare like fields.** Equipment voltage, phase, frequency and load are matched against the site supply, connection and protection. A single voltage figure is not a complete interface record.

## FAQ: Mortar sprayer site power

### Can I run the system from a generator?

Only after checking the generator rating, waveform, earthing and connection against the equipment requirements. A generator that starts the pump may still be unsuitable for the mixer or spraying head. Ask the supplier to review the proposed combination in writing.

### The brochure says 380 V. Is that enough to order?

No. You also need phase, frequency, current or breaker rating, connection type and cable distance. The site supply and the offered equipment have to be compared field by field.

### Does the mixer use the same supply as the pump?

Not necessarily. The brochure gives separate drive ratings for the pump and mixer, and the proposed configuration may place them on different circuits. Record each component separately rather than combining them into one total.

### Is electrical compatibility part of confined-space planning?

They are separate reviews. OSHA's confined-space standard addresses entry, atmospheric testing, attendants and rescue; electrical compatibility addresses the supply and connection. Both are needed before manhole work begins.

## References and source documents

- [Reliance — Mortar Sprayer System brochure: pump, mixer, spraying-head and winch data](https://reliancetrenchless.com/assets/doc/brochures/Reliance%20Mortar%20Sprayer%20%20System%20Brochure.pdf)
- [UK Health and Safety Executive — Electricity in construction](https://www.hse.gov.uk/electricity/information/construction.htm)
- [UK Health and Safety Executive — Maintenance of work equipment](https://www.hse.gov.uk/work-equipment-machinery/maintenance.htm)
- [US Occupational Safety and Health Administration — 29 CFR 1926.1200, Confined spaces in construction](https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.1200)